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Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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1

Thoron detection with an active Radon exposure meter—First results  

SciTech Connect (OSTI)

For state-of-the-art discrimination of Radon and Thoron several measurement techniques can be used, such as active sampling, electrostatic collection, delayed coincidence method, and alpha-particle-spectroscopy. However, most of the devices available are bulky and show high power consumption, rendering them unfeasible for personal exposition monitoring. Based on a Radon exposure meter previously realized at the Helmholtz Center Munich (HMGU), a new electronic prototype for Radon/Thoron monitoring is currently being developed, which features small size and weight. Operating with pin-diode detectors, the low-power passive-sampling device can be used for continuous concentration measurements, employing alpha-particle-spectroscopy and coincidence event registration to distinguish decays originating either from Radon or Thoron isotopes and their decay products. In open geometry, preliminary calibration measurements suggest that one count per hour is produced by a 11?Bq?m{sup ?3} Radon atmosphere or by a 15?Bq?m{sup ?3} Thoron atmosphere. Future efforts will concentrate on measurements in mixed Radon/Thoron atmospheres.

Irlinger, J., E-mail: josef.irlinger@helmholtz-muenchen.de; Wielunski, M.; Rühm, W. [ISS, Helmholtz Center Munich, Research Center for Environment and Health, 85764 Neuherberg (Germany)] [ISS, Helmholtz Center Munich, Research Center for Environment and Health, 85764 Neuherberg (Germany)

2014-02-15T23:59:59.000Z

2

Invited Article: Radon and thoron intercomparison experiments for integrated monitors at NIRS, Japan  

SciTech Connect (OSTI)

Inhalation of radon ({sup 222}Rn) and its short-lived decay products and of products of the thoron ({sup 220}Rn) series accounts for more than half of the effective dose from natural radiation sources. At this time, many countries have begun large-scale radon and thoron surveys and many different measurement methods and instruments are used in these studies. Consequently, it is necessary to improve and standardize technical methods of measurements and to verify quality assurance by intercomparisons between laboratories. Four international intercomparisons for passive integrating radon and thoron monitors were conducted at the NIRS (National Institute of Radiological Sciences, Japan). Radon exercises were carried out in the 24.4 m{sup 3} inner volume walk-in radon chamber that has systems to control radon concentration, temperature, and humidity. Moreover, the NIRS thoron chamber with a 150 dm{sup 3} inner volume was utilized to provide three thoron intercomparisons. At present, the NIRS is the only laboratory world-wide that has carried out periodic thoron intercomparison of passive monitors. Fifty laboratories from 26 countries participated in the radon intercomparison, using six types of detectors (charcoal, CR-39, LR 115, polycarbonate film, electret plate, and silicon photodiode). Eighteen laboratories from 12 countries participated in the thoron intercomparisons, using two etch-track types (CR-39 and polycarbonate) detectors. The tests were made under one to three different exposures to radon and thoron. The data presented in this paper indicated that the performance quality of laboratories for radon measurement has been gradually increasing. Results of thoron exercises showed that the quality for thoron measurements still needs further development and additional studies are needed to improve its measuring methods. The present paper provides a summary of all radon and thoron international intercomparisons done at NIRS from 2007 to date and it describes the present status on radon and thoron passive, one-time cycle monitors.

Janik, M., E-mail: mirek@fml.nirs.go.jp; Ishikawa, T.; Omori, Y.; Kavasi, N. [National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, 263-8555 Chiba (Japan)] [National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, 263-8555 Chiba (Japan)

2014-02-15T23:59:59.000Z

3

Determination of Radon and Thoron in Air  

Science Journals Connector (OSTI)

... A method for determination of radon favoured by the later investigators has been filtration of about 1 cubic metre of air ... of the activity found on the filter using a particle counter or ionization chamber ; radon passes through the filter and the short-lived activity observed is that of the four ...

G. B. COURTIER

1957-08-24T23:59:59.000Z

4

Long-term measurements of thoron, its airborne progeny and radon in 205 dwellings in Ireland  

Science Journals Connector (OSTI)

......Radiological Sciences, Chiba, Japan Long-term (circa 3 months...Radiological Sciences (NIRS), Japan, whereas thoron gas concentrations...Sciences (NIRS), Chiba, Japan, and University College Dublin...in two phases. In Phase 1, households, in or around the major population......

J. McLaughlin; M. Murray; L. Currivan; D. Pollard; V. Smith; S. Tokonami; A. Sorimachi; M. Janik

2011-05-01T23:59:59.000Z

5

It's Elemental - Isotopes of the Element Radon  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Astatine Astatine Previous Element (Astatine) The Periodic Table of Elements Next Element (Francium) Francium Isotopes of the Element Radon [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Radon has no naturally occurring isotopes. Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 193 1.15 milliseconds Alpha Decay 100.00% 194 0.78 milliseconds Alpha Decay 100.00% 195 6 milliseconds Alpha Decay 100.00% 195m 5 milliseconds Alpha Decay 100.00% 196 4.4 milliseconds Alpha Decay 99.90% Electron Capture ~ 0.10% 197 53 milliseconds Alpha Decay 100.00% 197m 25 milliseconds Alpha Decay 100.00% 198 65 milliseconds Alpha Decay No Data Available

6

Radon (Rn-222) and thoron (Rn-220) emanation fractions from three separate formations of oil field pipe scale  

E-Print Network [OSTI]

because of the external radiation exposure but also because of the radon gas emissions, both of which are due to the radioactive minerals contained in the scale. It was believed that the structure of the scale is formed tightly enough to prevent much...

Fruchtnicht, Erich Harold

2004-11-15T23:59:59.000Z

7

Radon-222 Emanation and the High Apparent Lead Isotope Ages in Lunar Dust  

Science Journals Connector (OSTI)

... 232Th decay chains may be a significant mechanism for a partial redistribution of the post-radon lead daughters. Kraner2 suggested that there may be an alpha-emitting radioactive deposit on ... radioactive deposit on the lunar surface as a result of the decay in space of radon isotopes which might diffuse out of lunar surface material. Turkevich3 reported evidence for such ...

J. A. S. ADAMS; PAULO M. BARRETTO; RONALD B. CLARK; JOE S. DUVAL

1971-05-21T23:59:59.000Z

8

Radon  

Science Journals Connector (OSTI)

... introduction to the non-specialist; and, with its clear exposition of the history of radon and its applications, it will convey to him something of the care essential in ... The second part of the book is concerned with the details of the process of radon extraction. Separate chapters are devoted to the radium sources used, the extraction and purifying ...

1949-04-30T23:59:59.000Z

9

Radon in atmospheric studies: a review  

SciTech Connect (OSTI)

The distribution of the isotopes of radon in space and time, their physical characteristics, and their behavior in the dynamics of the atmosphere have presented challenges for many decades. /sup 220/Rn, /sup 222/Rn and their daughters furnish a unique set of tracers for the study of transport and mixing processes in the atmosphere. Appropriate applications of turbulent diffusion theory yield general agreement with measured profiles. Diurnal and seasonal variations follow patterns set by consideration of atmospheric stability. /sup 222/Rn has been used successfully in recent studies of nocturnal drainage winds and cumulus convection. Good results have been obtained using /sup 222/Rn and its long-lived /sup 210/Pb daughter as tracers in the study of continent-to-ocean and ocean-to-continent air mass trajectories, /sup 220/Rn (thoron) because of its short half-life of only 55 seconds has been used to measure turbulent diffusion within the first few meters of the earth's surface and to study the influence of meteorological variables on the rate of exhalation from the ground. Radon daughters attach readily to atmospheric particulate matter which makes it possible to study these aerosols with respect to size spectra, attachment characteristics, removal by gravitation and precipitation, and residence times in the troposphere. The importance of ionization by radon and its daughters in the lower atmosphere and its effect on atmospheric electrical parameters is well known. Knowledge of the mobility and other characteristics of radon daughter ions has led to applications in the study of atmospheric electrical environments under fair weather and thunderstorm conditions and in the formation of condensation nuclei. The availability of increasingly sophisticated analytical tools and atmospheric measurement systems can be expected to add much to our understanding of radon and its daughters as trace components of the atmospheric environment in the years ahead.

Wilkening, M.

1981-01-01T23:59:59.000Z

10

Mobility determination of lead isotopes in glass for retrospective radon measurements  

Science Journals Connector (OSTI)

......Fig-1 where Pb is seen to be depleted in the diffused profiles in...Radon in homes and risk of lung cancer: collaborative analysis of...radonexposure assessment and lung cancer risk. J. Exposure Anal...radon exposure and risk of lung cancer in Missouri. Am. J. Public......

Mikko Laitinen; Iiro Riihimäki; Jörgen Ekman; A. R. Ananda Sagari; Lennart B. Karlsson; Somjai Sangyuenyongpipat; Sergey Gorelick; Heikki Kettunen; Heikki Penttilä; Ragnar Hellborg; Timo Sajavaara; Johan Helgesson; Harry J. Whitlow

2008-08-01T23:59:59.000Z

11

Mobility determination of lead isotopes in glass for retrospective radon measurements  

Science Journals Connector (OSTI)

......al. Retention of Pb isotopes in glass surfaces for...Vierinen K. The ion guide isotope separator online...Whitlow H. J. Boron diffusion in bulk cobalt...srim.org . Mobility determination of lead isotopes in glass for retrospective......

Mikko Laitinen; Iiro Riihimäki; Jörgen Ekman; A. R. Ananda Sagari; Lennart B. Karlsson; Somjai Sangyuenyongpipat; Sergey Gorelick; Heikki Kettunen; Heikki Penttilä; Ragnar Hellborg; Timo Sajavaara; Johan Helgesson; Harry J. Whitlow

2008-08-01T23:59:59.000Z

12

Carrying the Ball on Radon  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

4 4 Carrying the Ball on Radon Part one of two parts Radon gas was "discovered" as an important environmental issue in the mid-1980s, when levels 1,000 times the average of about 1.5 picocuries/liter (pCi/l) were found in homes in the eastern United States. Radon is present in all homes, and even in outdoor air, because it is a gaseous decay product of radium naturally present in the soil. Since even an average indoor exposure to radon's own decay products-isotopes of polonium, bismuth, and lead-was estimated to cause a 0.1 to 1% risk of lung cancer, depending on whether one smoked, these high levels sounded an immediate alarm. By the mid-1980s, scientists had already proven that indoor radon levels 10 to 100 times the average-an unacceptable amount-occurred in homes in

13

Radon emissions  

Science Journals Connector (OSTI)

... SIR,-Wendy Barnaby (August 28) writes on the problem of radon emission from the tailings of uranium milling in Sweden. This problem would arise from ... that has to be treated. She describes Professor Robert O. Pohl's report that "radon can escape more easily from the broken ground of a mine than from an undisturbed ...

SVEN-ERIC BRUNNSJO

1975-10-09T23:59:59.000Z

14

Radon activity  

Science Journals Connector (OSTI)

... EXPOSURE to large quantities of radioactive radon gas in the home is associated with a high frequency of mutations in a gene ... controversial idea that leukaemia is more prevalent in countries where the average indoor concentration of radon is high. The blood samples were taken from 20 non-smoking adults from the ...

1991-05-23T23:59:59.000Z

15

Radon Training for Professionals  

E-Print Network [OSTI]

's International Radon Project, EPA, states, Canadian provinces, tribal nations, partner Regional Radon Training University. · MURC is widely respected as an international leader in radon training. · Your course is fromRadon Training for Professionals 2008-2009 www.cce.umn.edu/radon Regional Radon Training Center

Netoff, Theoden

16

Assessment of the radiological impact of gamma and radon dose rates at former U mining sites in Central Asia  

Science Journals Connector (OSTI)

An assessment of the radiological situation due to exposure to gamma radiation, radon and thoron was carried out at selected former uranium mining and processing sites in the Central Asian countries of Kazakhstan, Kyrgyzstan, Uzbekistan and Tajikistan. Gamma dose rate measurements were made using various field instruments and radon/thoron measurements were carried out using discriminative radon (222Rn)/thoron (220Rn) solid state nuclear track detectors (SSNTD). The detectors were exposed for an extended period of time, including at least three seasonal periods in a year, in different outdoor and indoor public and residential environments at the selected uranium legacy sites. The results showed that gamma, Rn and Tn doses were in general low, which consequently implies a low/relatively low radiological risk. The major radiation hazard is represented by abandoned radioactive filtration material that was being used as insulation by some Minkush residents (Kyrgyzstan) for a longer period of time. Annual radiation doses of several hundred mSv could be received as a consequence of using this material domestically. In addition, the gamma and Rn/Tn dose rates at Digmai, Tajikistan, could reach values of several 10 mSv/a. The doses of ionizing radiation deriving from external radiation (gamma dose rate), indoor radon and thoron with their short-lived progenies in several cases exceeded the recommended annual effective dose threshold level of 10 mSv. At none of the sites investigated did the individual annual effective doses exceed 30 mSv, the internationally recommended value for considering intervention. Current doses of ionizing radiation do not represent a serious hazard to the health of the resident public, but this issue should be adequately addressed to further reduce needless exposure of the resident public to ionizing radiation.

P. Stegnar; I. Shishkov; M. Burkitbayev; B. Tolongutov; M. Yunusov; R. Radyuk; B. Salbu

2013-01-01T23:59:59.000Z

17

Collaborative investigations on thoron and radon in some rural communities of Balkans  

Science Journals Connector (OSTI)

......Gornja Stubla-uranium-thorium anomaly...Bujanovac are depleted uranium targeted sites...the only risk health population zone...wooden house. Health Phys. (1994...Programme). Depleted uranium in Bosnia and......

Z. S. Zunic; I. Celikovic; S. Tokonami; T. Ishikawa; P. Ujic; A. Onischenko; M. Zhukovsky; G. Milic; B. Jakupi; O. Cuknic; N. Veselinovic; K. Fujimoto; S. K. Sahoo; I. Yarmoshenko

2010-10-01T23:59:59.000Z

18

RESULTS OF SIMULTANEOUS RADON AND THORON MEASUREMENTS IN 33 METROPOLITAN AREAS OF CANADA  

Science Journals Connector (OSTI)

......participants had to be the head of the household and 18 y of age or older. Participants...Institute of Radiological Sciences in Japan (commercially known as RADUET...metropolitan areas. About 92.5 % of households phoned were eligible to participate......

Jing Chen; Lauren Bergman; Renato Falcomer; Jeff Whyte

2014-04-01T23:59:59.000Z

19

Radon in Homes: Recent Developments  

Science Journals Connector (OSTI)

Radon in Homes: Recent Developments ... This report gives an update on current developments regarding the issue of radon in homes. ...

Charles H. Atwood

2006-10-01T23:59:59.000Z

20

Measurements of thoron progeny concentration using apotential alpha-energy monitor in Japan  

SciTech Connect (OSTI)

It is reported that thoron concentration in Japanese dwellings may be higher than in other dwellings. Therefore, in order to assess the risk for indoor thoron progeny, the portable potential alpha-energy monitor has been developed. The monitor detects alpha-particles from the {sup 212}Po collected on the filter using a piece of cellulose nitrate film. The detection efficiency of the alpha-particles has been estimated by Monte Carlo calculation. From the results of measurements, the mean indoor thoron progeny concentration in the dwellings was 1.5 Bq m{sup -3} (EC{sub Tn}), and ranged from 0.04 to 8.2 Bq m{sup -3}. The effects of three typical interior walls (soil-based plaster, concrete, and modern materials) on the thoron progeny supply were considered. The mean annual effective dose equivalent was 0.45 mSv. 13 refs., 5 figs., 1 tab.

Yamasaki, T. [Chubu Electric Power Company, Inc., Nagoya (Japan); Iida, T. [Nagoya Univ. (Japan)

1995-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Radon in Syrian houses  

Science Journals Connector (OSTI)

A nationwide investigation of radon levels in Syrian houses was carried out during the period 1991 - 1993. Passive radon diffusion dosemeters using polycarbonate detectors were distributed in houses all over Syria. Detectors were subjected to electrochemical etching to reveal latent tracks of alpha particles. The mean radon concentration in Syrian houses was found to be with some values several times higher. This investigation indicated that there were a few houses in Syria that require remedial action. Most houses that have high levels of radon were found in the southern area, especially in the Damascus governorate. The study also indicated that radon concentrations were higher in old houses built from mud with no tiling.

I Othman; M Hushari; G Raja; A Alsawaf

1996-01-01T23:59:59.000Z

22

Risk of radon  

Science Journals Connector (OSTI)

... 10"4 per working level month would be an appropriate upper bound for exposure to radon decay products in the home.

M.C. O.'RIORDAN

1981-09-17T23:59:59.000Z

23

Home Safety: Radon Gas  

E-Print Network [OSTI]

Every home should be tested for radon, an invisible, odorless, radioactive gas that occurs naturally. This publication explains the health risks, testing methods, and mitigation and reduction techniques....

Shaw, Bryan W.; Denny, Monica L.

1999-11-12T23:59:59.000Z

24

Leukaemia risks and radon  

Science Journals Connector (OSTI)

... SIR - A correlation has been established between domestic radon exposure and mutation in peripheral T lymphocytes1. Some caution must be exercised, however, ... result

SIMON P. WOLFF

1991-07-25T23:59:59.000Z

25

Radon scare doubted  

Science Journals Connector (OSTI)

... University of Bristol claim, in last week's issue of the Lancet, that radioactive radon gas seeping into buildings may cause leukaemia and several other cancers. The team, led ... other cancers. The team, led by Denis Henshaw, correlated leukaemia records with average indoor radon concentrations across 14 countries. They believe that ...

Peter Aldhous

1990-05-03T23:59:59.000Z

26

Radon risk reassessed  

Science Journals Connector (OSTI)

... UNDERGROUND miners who are heavily exposed to the radioactive decay products of radon gas (see figure) suffer especially high rates of lung cancer. Extrapolation from these ... figure) suffer especially high rates of lung cancer. Extrapolation from these data suggests that radon in people's homes may cause some 2,000 lung cancers each year in Britain1 ...

Julian Peto; Sarah Darby

1994-03-10T23:59:59.000Z

27

Risk of radon  

Science Journals Connector (OSTI)

... 98) considered the individual lung cancer risk to the general population from indoor exposure to radon-222 and concluded that a current upper estimate is 10"4 per lifetime per working ... estimate, a further potentially major consideration was not included. The general background effect of radon was assessed by identifying lung cancer rates before cigarette smoking became popular. Those rates ...

ROBERT L. FLEISCHER

1981-09-17T23:59:59.000Z

28

EPA discovers radon  

Science Journals Connector (OSTI)

... when they are of mineral construction such as stone, are also either a source of radon, the radioactive rare gas whose atoms are inescapably intermediates in the radioactive decay of ... it. One consequence is that all creatures on the surface of the Earth take in radon with every breath they breathe. Another is that those who live in houses may ...

1986-08-28T23:59:59.000Z

29

Radon Content of Rainwater  

Science Journals Connector (OSTI)

... mjjic./l. of rainwater and was due primarily to radium B + C. Since radon is present throughout the atmosphere, it continually supplies decay products which become attached to ... continually supplies decay products which become attached to aerosols and condensation droplets. The equilibrium between radon and radium A + B + C being established in about 4 h, the ...

PARTHA BANERJI; S. D. CHATTERJEE

1964-12-19T23:59:59.000Z

30

Little danger from radon  

Science Journals Connector (OSTI)

... the potential alpha energy in air from any combination of the short-lived daughters of radon. 1 WL = 1.3 ? 10" MeV nT3). A recent survey ( ... Biol 23, 696-711; 1978) estimated that the average population exposure rate domestically to radon daughters for Great Britain is about 0.15 WLM per year.

K. D. CLIFF; B. L. DAVIES; J. A. REISSLAND

1979-05-03T23:59:59.000Z

31

Ionisation Potential of Radon  

Science Journals Connector (OSTI)

... WE have determined the ionisation potential of radon, using the well-known method,1 due to Hertz, of compensation of the negative ... xenon and krypton: it was found to be 2.6 volts. The quantity of radon used in different experiments was of the order of 300 millicuries. The volume of ...

F. HOLWECK; L. WERTENSTEIN

1930-09-20T23:59:59.000Z

32

Radon to predict earthquakes  

Science Journals Connector (OSTI)

... , at least in the West, is the apparently premonitory change in the emission of radon. In a brief conference abstract King (Eos, 56, 1019; 1975) recently reported ... conference abstract King (Eos, 56, 1019; 1975) recently reported that monitoring of the radon concentration in soil gas was begun in May 1975 at 18 sites along an active ...

Peter J. Smith

1976-05-13T23:59:59.000Z

33

Some aspects of the radon problem in Kazakhstan  

Science Journals Connector (OSTI)

Publisher Summary Preliminary analysis shows that the population of Kazakhstan lives primarily in potentially dangerous areas from the radioactivity exposure point of view. According to selected studies, radon isotope PAEC values in premises where people stay for long times may exceed allowable levels by several times. At the same time, on account of insufficient organization of work on a national scale, lack of funds, standard methods and metrology equipment, no radon studies are actually performed even in those regions where geological rock structure and availability of tectonic faults suggest that an excess radon concentration in residential and public buildings may be anticipated. Preliminary recorded data from independent studies show that increased radon concentrations in living premises are typical of the Republic. The survey of population exposure from natural sources of ionizing radiation in Akchatau village in Zhezkazgan oblast and the survey done in Almaty are insufficient to understand and solve the problem in Kazakhstan in general.

V.N. Sevostyanov

2005-01-01T23:59:59.000Z

34

unstable isotope  

Science Journals Connector (OSTI)

unstable isotope, radioisotope ? unstabiles Isotop n, nichtstabiles Isotop, radioaktives Isotop, Radioisotop

2014-08-01T23:59:59.000Z

35

It's Elemental - Isotopes of the Element Francium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Radon Radon Previous Element (Radon) The Periodic Table of Elements Next Element (Radium) Radium Isotopes of the Element Francium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Francium has no naturally occurring isotopes. Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 199 12 milliseconds Alpha Decay > 0.00% Electron Capture No Data Available 200 49 milliseconds Alpha Decay 100.00% 201 62 milliseconds Alpha Decay 100.00% 201m 19 milliseconds Alpha Decay 100.00% 202 0.30 seconds Alpha Decay 100.00% 202m 0.29 seconds Alpha Decay 100.00% 203 0.55 seconds Alpha Decay <= 100.00% 204 1.8 seconds Alpha Decay 92.00%

36

Czech primary radon measurement equipment  

Science Journals Connector (OSTI)

......radium needles in a depleted uranium shielding are used...for radon. Environ. Health. Perspect. (1991...exposure to Rn daughters. Health. Phys. (1998) 54...al. Radon and public health, report of the independent......

Ivo Burian; Petr Otahal; Josef Vosahlik; Eliska Pilecka

2011-05-01T23:59:59.000Z

37

ORNL-5489 Radon and Radon Daughter  

Office of Legacy Management (LM)

_._-l"." _._-l"." .-_ "...",.,~~-- ORNL-5489 Radon and Radon Daughter Measurements at and near the Former Middlesex Sampling Plant, Middlesex, New Jersey F. F. Haywood P. T. Perdue D. J . Chris tian R. W . Leggett H. W . Dickson T. E. Myric k ,--___ . . . ^.. Printed in the United States of America. Available from National Technical information Service US. Department of Commerce 5285 Port Royal Road, Springfield, Virginia 22161 NTIS price codes-Printed Copy: A04 Microfiche A01 This report was prepared as an account of work sponsored by an agency of the United StatesGovernment. Neither theU nited States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or

38

Radon programmes and health marketing  

Science Journals Connector (OSTI)

......possible way is to employ health marketing that draws...INTRODUCTION Being aware of health effects of the exposure...people that radon is dangerous. Generally, people...radon could not be so dangerous. Table-1. Risk perception...stronger evidence of radon health effects(4) WHO draws......

Ivana Fojtikova; Katerina Rovenska

2011-05-01T23:59:59.000Z

39

Radon: a bibliography  

SciTech Connect (OSTI)

The Lawrence Berkeley Laboratory, with the support of the Department of Energy, has developed a computerized database to manage research information in the area of building ventilation and indoor air quality. This literature survey contains references pertaining to the physical properties of radon and its daughters, instrumentation for their measurement, health effects, surveys and measurements, and regulatory information. The references in the bibliography are sequenced in alphabetical order and abstracts are included when supplied by the author. The objective of this report is to disseminate the bibliographic references compiled at the laboratory relating to radon research portion of the program. Interested database users are encouraged to contact the laboratory to receive instructions for direct database acess. A flyer describing the database is supplied at the end of the bibliography and a brief overview of the Radon Research porgram is given.

Lepman, S.R.; Boegel, M.L.; Hollowell, C.D.

1981-01-01T23:59:59.000Z

40

EPA urges testing of homes for radon  

Science Journals Connector (OSTI)

EPA urges testing of homes for radon ... The action was based on cooperative surveys of home radon levels conducted by EPA and 17 states. ...

DAVID HANSON

1988-09-19T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

How to live with radon  

Science Journals Connector (OSTI)

... hundred is from fumes, falls or fires. If potential deaths from indoor exposure to radon are included, home seems even less a haven. Participants at a recent meeting* ... included, home seems even less a haven. Participants at a recent meeting* agreed that radon is the most serious cause of human irradiation, attempted to quantify the consequences for ...

Michael O'Riordan

1988-01-28T23:59:59.000Z

42

Do radon anomalies predict earthquakes?  

Science Journals Connector (OSTI)

... THE discovery that the radon content of groundwater in a deep well increased significantly before the magnitude 5.3 Tashkent ... prompted many research groups in the USSR, China, Japan and the US to monitor radon levels in wells and springs in earthquake-prone zones. Many ...

Chi-Yu King

1981-09-24T23:59:59.000Z

43

Radon: An Overview of Health Effects  

Science Journals Connector (OSTI)

Radon is one of the most comprehensively studied human carcinogens. It is a naturally occurring noble gas, and due to current construction methods, radon concentrations often become enhanced indoors. Radon is the largest single contributor to the natural radiation exposure to the general public. Two of its radioactive decay products, polonium-218 and polonium-214, impart the majority of radiation dose to the lungs, rather than the radon gas itself. In fact, protracted exposure to radon and its decay products is one of the greatest environmental health threats. Radon is the second leading cause of lung cancer in North America and the leading cause of lung cancer for individuals who have never smoked. Overall, radon is also the leading environmental cause of cancer mortality in North America. In vitro studies, controlled studies of radon-exposed animals, a variety of radiobiological analyses, 15 retrospective cohort studies of radon-exposed underground miners, and analyses of 22 pooled residential epidemiologic studies from North America, China, and Europe convincingly demonstrate that radon is a human lung carcinogen even at concentrations commonly encountered in the residential setting. Because of the significant health risks related to residential radon exposure, the World Health Organization (WHO) instituted an international initiative in 2005, the International Radon Project, to reduce indoor radon risks. This article and the following articles on radon provide a general overview of its characteristics, sources, occurrence, and health effects, as well as guidance on both radon measurement and mitigation.

R.W. Field

2011-01-01T23:59:59.000Z

44

Chemical Methods for Removing Radon and Radon Daughters from Air  

Science Journals Connector (OSTI)

...OF LUNG CANCER AMONG URANIUM MINERS, HEALTH PHYSICS 16 : 563 ( 1969...OF MINERS TO RADON, HEALTH PHYSICS 16 : 547 ( 1969...E., MORTALITY OF URANIUM MINERS IN RELATION TO...THROUGH SEPTEMBER 1967, HEALTH PHYSICS 16 : 571 ( 1969...

Lawrence Stein

1972-03-31T23:59:59.000Z

45

Radon - HPMC Occupational Health Services  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Awareness Cold and Flu Prevention Hand Washing Healthy Sleep Heat Stress Radon Signs of a Heart Attack Signs of a Stroke Distracted Driving Coping with Stress & Change Skin Cancer...

46

Radon Content of the Atmosphere  

Science Journals Connector (OSTI)

... preliminary work. The absence of levels of a higher order suggests that the contribution of radon from this source does not represent a significant addition to the total atmospheric level. ... Domestic 0.70

W. ANDERSON; R. C. TURNER

1956-07-28T23:59:59.000Z

47

Radon programmes and health marketing  

Science Journals Connector (OSTI)

......programmes and projects Radon programmes and health marketing Ivana Fojtikova * Katerina Rovenska * Corresponding...basis? One possible way is to employ health marketing that draws together traditional marketing theories and science-based strategies to......

Ivana Fojtikova; Katerina Rovenska

2011-05-01T23:59:59.000Z

48

Radon Content of the Air  

Science Journals Connector (OSTI)

... namely, 0.009 and 0.018 micron. Hence it is not surprising that the radon values for the atmosphere as deduced from the filter paper method are too low. ... Bartholomew s Hospital in London a mean value of 0.94 x 10-16 curie radon/ml., and for May of the same year 0.28 x 10-16 curie ...

F. B?HOUNEK; M. MAJEROVÁ

1956-12-29T23:59:59.000Z

49

Simulation of Radon Transport in Geothermal Reservoirs  

SciTech Connect (OSTI)

Numerical simulation of radon transport is a useful adjunct in the study of radon as an in situ tracer of hydrodynamic and thermodynamic numerical model has been developed to assist in the interpretation of field experiments. The model simulates transient response of radon concentration in wellhead geofluid as a function of prevailing reservoir conditions. The radon simulation model has been used to simulate radon concentration response during production drawdown and two flowrate transient tests in vapor-dominated systems. Comparison of model simulation with experimental data from field tests provides insight in the analysis of reservoir phenomena such as propagation of boiling fronts, and estimates of reservoir properties of porosity and permeability thickness.

Semprini, Lewis; Kruger, Paul

1983-12-15T23:59:59.000Z

50

Characterizing the source of radon indoors  

SciTech Connect (OSTI)

Average indoor radon concentrations range over more than two orders of magnitude, largely because of variability in the rate at which radon enters from building materials, soil, and water supplies. Determining the indoor source magnitude requires knowledge of the generation of radon in source materials, its movement within materials by diffusion and convection, and the means of its entry into buildings. This paper reviews the state of understanding of indoor radon sources and transport. Our understanding of generation rates in and movement through building materials is relatively complete and indicates that, except for materials with unusually high radionuclide contents, these sources can account for observed indoor radon concentrations only at the low end of the range observed. Our understanding of how radon enters buildings from surrounding soil is poorer, however recent experimental and theoretical studies suggest that soil may be the predominant source in many cases where the indoor radon concentration is high. 73 references, 3 figures, 1 table.

Nero, A.V.; Nazaroff, W.W.

1983-09-01T23:59:59.000Z

51

Radon reduction and radon monitoring in the NEMO experiment  

E-Print Network [OSTI]

) Abstract: The first data of the NEMO 3 neutrinoless double beta decay experiment have shown that the radon in the LSM (Laboratoire Souterrain de Modane, depth of 4800 m w.e.), investigates the neutrinoless double beta decay (20) of various nuclei [1]. The observation of such a process will give us fundamental

Paris-Sud XI, Université de

52

Estimation of mean annual effective dose through radon concentration in the water and indoor air of Islamabad and Murree  

Science Journals Connector (OSTI)

......strength to the energy of alpha particle...particles of different energies. Different isotopes...different alpha energies and produce different...about 30 min, the average radon content is...estimate of water consumption (60 la1), respectively...having ventilated homes structure, though......

N. Ali; E. U. Khan; P. Akhter; F. Khan; A. Waheed

2010-09-01T23:59:59.000Z

53

Radon programme: presence and future  

Science Journals Connector (OSTI)

......basement and ground floor, one-third...house, subsoil water level, construction...provide subsidy for remediation. The radon issue...protection) and remediation of existing exposure...providers of water are enforced...material and water at the market...to 4000) for remediation. The system......

J. Hulka

2008-06-01T23:59:59.000Z

54

Indoor radon: the deadliest pollutant  

Science Journals Connector (OSTI)

...chance to seep from the ground into homes in lethal...outdoor air, drinking water, and food (hatched...The most effective remediation approach is to reverse...a prominent radon remediation con-sultant in Mississauga...operator graded the ground before the basement...

RA Kerr

1988-04-29T23:59:59.000Z

55

Radon remediation and prevention status in 23 European countries  

Science Journals Connector (OSTI)

......mostly occurs at home. Existing...moreover, the average radon concentration...potential impact on energy consumption (qualitative...potential impact on energy consumption are not addressed...the national average radon concentration...Radon in homes and risk of......

O. Holmgren; H. Arvela; B. Collignan; M. Jiránek; W. Ringer

2013-12-01T23:59:59.000Z

56

Radon and Lung Cancer in the American Cancer Society Cohort  

Science Journals Connector (OSTI)

...Porstendorfer J , Reineking A.Radon: characteristics in...conversion coefficients for radon progeny for different...Epidemiology Reanalysis Project.Cambridge, MA:Health...Health Organization.International classification of diseases...gov/IEP/high-radon/files.html . 24...

Michelle C. Turner; Daniel Krewski; Yue Chen; C. Arden Pope III; Susan Gapstur; and Michael J. Thun

2011-03-01T23:59:59.000Z

57

Radon Concern in the Hickory Aquifer  

E-Print Network [OSTI]

Radon ConcernStory by Amanda Crawford tx H2O | pg. 20 As the primary water source for Mason,Concho, McCulloch, San Saba, Menard, Kimble, and Gillespie counties in Central Texas, the threat of elevated radionuclide concentra- tions... in the Hickory Aquifer's groundwater poses health risks for residents in the area. Radon is a natural, radioactive gas that may be found indoors in air or drinking water. Radon is the decay product of radium, so radon indi- rectly reflects the presence...

Crawford, Amanda

2005-01-01T23:59:59.000Z

58

SWOT analysis of the Czech Radon programme  

Science Journals Connector (OSTI)

......raising radon awareness and risk perception among the...3). To avoid this risk, new solutions and new...government departments (political subsidy), cooperation...underestimate the radon risk The positive influence...Low concern of banks, insurance companies and real estate......

I. Fojtíková

2014-07-01T23:59:59.000Z

59

An overview of Ireland's National Radon Policy  

Science Journals Connector (OSTI)

......for radon in drinking water of 500 Bq m3 and 1000 Bq m3 for public and private water supplies, respectively...the duty of care that a water supplier has towards...carried out in 38 531 ground floor classrooms and...extensive and successful remediation programme to reduce radon......

S. Long; D. Fenton

2011-05-01T23:59:59.000Z

60

Measurement of Radon in Soil Gas  

Science Journals Connector (OSTI)

... CONCENTRATIONS of the order of 100,000-1,000,000 pc. radon/m3 are found in the gases trapped in common soils and rock1. The estimation ... m3 are found in the gases trapped in common soils and rock1. The estimation of radon in the soil gas and the free atmosphere has been suggested as a tool for ...

K. G. VOHRA; M. C. SUBBARAMU; A. M. MOHAN RAO

1964-01-04T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Concentration of Atmospheric Radon and Wind Direction  

Science Journals Connector (OSTI)

... in Lisbon, near the sea, is therefore excellent to test any probable relationship between radon concentration and wind directions since only half the possible wind directions are continental ones, ... since only half the possible wind directions are continental ones, therefore corresponding probably to higher radon concentrations. In order to study any correlation, the concentration of ...

F. BARREIRA

1961-06-17T23:59:59.000Z

62

Retrospective determination of radon in houses  

Science Journals Connector (OSTI)

... Indoor exposure to decay products of radon (222Rn) contributes the largest fraction of natural radiation dose to people living in subarctic ... of natural radiation dose to people living in subarctic or temperate regions of the world. Radon is an inert and radioactive gas in the natural decay series that commences with 238U ...

Christer Samuelsson

1988-07-28T23:59:59.000Z

63

The Radon Content of the Atmosphere  

Science Journals Connector (OSTI)

... MEASUREMENTS of the radon content of the atmosphere were made so long ago as 1905 by Eve1-2 in ... whole seemed to support the original suggestion of Elster and Geitel6 in 1903 that the radon in the atmosphere arises mainly from the soil. These workers noted that the highest ...

W. ANDERSON; W. V. MAYNEORD; R. C. TURNER

1954-09-04T23:59:59.000Z

64

Radon emanation on San Andreas Fault  

Science Journals Connector (OSTI)

... RADON is constantly emanated from the Earth into its atmosphere, normally in minute amounts. ... is constantly emanated from the Earth into its atmosphere, normally in minute amounts. Radon emanation is known to be anomalously large on active faults and to show temporal variations ...

Chi-Yu King

1978-02-09T23:59:59.000Z

65

Earth science: Radon and rock deformation  

Science Journals Connector (OSTI)

... crustal deformation. This ‘unproven’ category includes the well-documented precursory decrease and increase of radon concentration before the 1978 Izu-Oshima earthquake in Japan (Fig. 1), as well ... local electric field. Trique et al. now report that various phenomena — bursts of radon gas, changes of electric potential, and departures of ground tilt from that predicted on ...

Evelyn Roeloffs

1999-05-13T23:59:59.000Z

66

Radon and the risks of cancer  

Science Journals Connector (OSTI)

... of April, Denis Henshaw and colleagues1 published their finding of significant correlations between average indoor radon levels in different countries and the incidence of leukaemia and other cancers in children, ... a similar correlation for prostatic cancer2. Significant regional correlations have also been reported between indoor radon and acute myeloid leukaemia in Britain3 and Canada1.

Julian Peto

1990-05-31T23:59:59.000Z

67

Safe as houses? The risks of radon  

Science Journals Connector (OSTI)

... general lack of public concern about the health risks caused by the natural radioactive gas radon is one of the odder features of modern life. Whatever the reasons for that ... it deals with other alpha emitters, ingested rather than inhaled, as well as with radon and its short-lived decay products. These other alpha emitters will usually be found ...

John Fremlin

1988-09-08T23:59:59.000Z

68

National Radon Contractor Proficiency (RCP) Program. Proficiency report, June 1991  

SciTech Connect (OSTI)

The primary objective of the U.S. Environmental Protection Agency's (EPA) efforts to address the indoor radon problem is to reduce radon levels in buildings throughout the country. Achieving the objective requires a nationwide supply of capable radon mitigation contractors. In the Indoor Radon Abatement Act of 1988, Congress authorized EPA to establish a program to evaluate radon mitigation contractors and to provide the information to the public in cooperation with the States. The Radon Contractor Proficiency (RCP) Program was developed to assist States, EPA Regions, local government officials, and the public in selecting contractors who have demonstrated their proficiency in reducing indoor radon levels. The program is managed by the EPA Office of Radiation Programs' Radon Division. Under the voluntary program, radon contractors demonstrate their proficiency by meeting specific Program requirements. Individual contractors who meet these requirements are then listed in periodic RCP Proficiency Reports.

Not Available

1991-06-01T23:59:59.000Z

69

Isotope Analysis  

Science Journals Connector (OSTI)

Naturally occurring oxygen includes three stable isotopes,16O,17O, and18O, with the relative abundances of 99.763%, 0.0375%, and 0.1995%, respectively. Isotopic analysis does not consider the absolute abundances ...

Tandong Yao; Wusheng Yu; Huabiao Zhao…

2014-08-01T23:59:59.000Z

70

Ris-R-1201(EN) Radon Transport Modelling  

E-Print Network [OSTI]

in atmospheric pressure. It can also be used for flux calculations of radon from the soil surface or to model of soil gas and combined generation, radioactive decay, diffusion and advection of radon can be solved. Moisture is included in the model, and partitioning of radon between air, water and soil grains (adsorption

71

Generalised finite radon transform for N x N images  

Science Journals Connector (OSTI)

This paper extends the domain of the finite radon transform (FRT) to apply to square arrays of arbitrary size. The FRT is a discrete formalism of the Radon transform that assumes the image is periodic over the finite array Z"N^2 and requires only arithmetic ... Keywords: Discrete projection, Discrete radon transform, Fourier slice theorem, Image representation

Andrew Kingston; Imants Svalbe

2007-10-01T23:59:59.000Z

72

Carbon Isotopes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atmospheric Trace Gases » Carbon Isotopes Atmospheric Trace Gases » Carbon Isotopes Carbon Isotopes Gateway Pages to Isotopes Data Modern Records of Carbon and Oxygen Isotopes in Atmospheric Carbon Dioxide and Carbon-13 in Methane 800,000 Deuterium Record and Shorter Records of Various Isotopic Species from Ice Cores Carbon-13 13C in CO Measurements from Niwot Ridge, Colorado and Montana de Oro, California (Tyler) 13C in CO2 NOAA/CMDL Flask Network (White and Vaughn) CSIRO GASLAB Flask Network (Allison, Francey, and Krummel) CSIRO in situ measurements at Cape Grim, Tasmania (Francey and Allison) Scripps Institution of Oceanography (Keeling et al.) 13C in CH4 NOAA/CMDL Flask Network (Miller and White) Northern & Southern Hemisphere Sites (Quay and Stutsman) Northern & Southern Hemisphere Sites (Stevens)

73

URANIUM MILL TAILINGS RADON FLUX CALCULATIONS  

E-Print Network [OSTI]

at the Piñon Ridge Property in western Montrose County, Colorado. The Piñon Ridge Mill includesURANIUM MILL TAILINGS RADON FLUX CALCULATIONS PI�ON RIDGE PROJECT MONTROSE COUNTY, COLORADO Submitted To: Energy Fuels Resources Corporation 44 Union Boulevard, Suite 600 Lakewood, Colorado 80228

74

SWOT analysis of the Czech Radon programme  

Science Journals Connector (OSTI)

......the population in healthy housing Aggressive sales campaigns...Czech men in having their new house in good shape Builders underestimate...Davies M., Wilkinson P. Home energy efficiency and radon related risk of...in low energy and passive houses in Austria. (2012) RADPAR......

I. Fojtíková

2014-07-01T23:59:59.000Z

75

Residential radon remediation: performance over 17 years  

Science Journals Connector (OSTI)

......covering about 1000 m2. Water drains into the basin...sub-slab ventilation remediation system installed, i...sub-slab ventilation remediation (Bq mSE). Measured...concentration with height above ground level. For example...had a sub-slab radon remediation system installed that......

Naomi H. Harley; Passaporn Chittaporn; Anthony Marsicano

2011-05-01T23:59:59.000Z

76

An investigation into the knowledge and attitudes towards radon testing among residents in a high radon area  

Science Journals Connector (OSTI)

The aim of this study was to investigate the knowledge and attitudes of residents in the Castleisland area to radon. Castleisland in Co. Kerry was described as a high radon area following the discovery of a house in the area with radon levels 245 times that of the national reference level. Residents in this area were then asked to measure their homes for radon in the Castleisland radon survey. The uptake of this measurement was 17%. In order to investigate this response rate further, a questionnaire was designed and distributed to residents in the Castleisland area. This questionnaire measured the testing history of the participants, the reasons for testing/not testing, the factors important to them when considering having their home tested, radon knowledge and finally intentions to measure their home for radon. It was found that the main reason people do not test their home for radon is that they believe their home does not have a problem. Optimistic bias was thought to play a role here. The subjective norm component of the theory of planned behaviour was found to have a significant independent contribution in the variation in intentions to measure one's home for radon and this in turn could be targeted to increase uptake of radon measurement in the future.

Susan Clifford; David Hevey; Gerard Menezes

2012-01-01T23:59:59.000Z

77

from Isotope Production Facility  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cancer-fighting treatment gets boost from Isotope Production Facility April 13, 2012 Isotope Production Facility produces cancer-fighting actinium 2:32 Isotope cancer treatment...

78

Reassessing Radon in Drinking Water: Searching for Perspective on Radiation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Reassessing Radon in Drinking Water: Searching for Perspective on Radiation Reassessing Radon in Drinking Water: Searching for Perspective on Radiation Risks Speaker(s): Richard Sextro Date: October 27, 1998 - 12:00pm Location: 90-3148 Although most of the exposures to radon and its radioactive decay products arise from indoor airborne radon originating in the soil adjacent to buildings, some contact with radon can occur due to its presence in drinking water. The exposures and health risks associated with radon dissolved in drinking water are typically much smaller, although the magnitude of the exposures and risks have been uncertain and the subject of some controversy. The 1996 Amendments to the (U.S.) Safe Drinking Water Act required the U.S. Environmental Protection Agency to contract with the U.S. National Academy of Sciences (NAS) to re-evaluate the risks associated with

79

Ambient Radon-222 Monitoring in Amargosa Valley, Nevada  

SciTech Connect (OSTI)

As part of a program to characterize and baseline selected environmental parameters in the region around the proposed repository at Yucca Mountain, Nevada, ambient radon-222 monitoring was conducted in the rural community of Amargosa Valley, the community closest to the proposed repository site. Passive integrating radon monitors and a continuous radon monitoring instrument were deployed adjacent to the Community Environmental Monitoring Program (CEMP) (http://www.cemp.dri.edu/index.html) station located in the Amargosa Valley Community Center near the library. The CEMP station provided real-time ambient gamma exposure and meteorological data used to correct the integrated radon measurements as well as verify meteorological data collected by the continuous radon monitoring instrument. Additionally, different types of environmental enclosures that housed the monitors and instrument were used to determine if particular designs influenced the ambient radon measurements.

L.H. Karr; J.J. Tappen; D. Shafer; K.J. Gray

2008-06-05T23:59:59.000Z

80

High Radon Levels in Homes Spark Moves To Combat Pollutant  

Science Journals Connector (OSTI)

High Radon Levels in Homes Spark Moves To Combat Pollutant ... Federal, state agencies have initiated programs to monitor levels of this inert radioactive gas in homes in certain areas and work out control strategy ... Health care officials have been concerned about radon for more than 20 years, but public attention reached a new high recently with the discovery of high levels of radon inside homes in the New Jersey- Pennsylvania-New York area. ...

DAVID J. HANSON

1985-11-18T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

WHO network and international collaborative project on residential radon risk  

Science Journals Connector (OSTI)

This paper describes WHO's project on assessment of health risks from residential radon exposure and development of an evidence base for guidelines and policies for Member States. The project will assess global burden of disease associated with in-door radon exposure and provide tools for risk communication on radon risks and mitigation procedures. The purpose of the paper is to draw attention and encourage participation of the international scientific community and national authorities to the new initiative of WHO.

Zhanat Carr; Michael Repacholi

2005-01-01T23:59:59.000Z

82

Isotope studies in photosynthesis  

Science Journals Connector (OSTI)

Isotope studies in photosynthesis ... Examines the use of isotopic oxygen, hydrogen, carbon, and phosphorus in the study of photosynthesis. ...

J. A. Bassham; A. A. Benson; Melvin Calvin

1953-01-01T23:59:59.000Z

83

Applications of radon distribution and radon flux for the determination of oceanic mixing and air-sea gas exchange  

E-Print Network [OSTI]

APPLICATIONS OF RADON DISTRIBUTION AND RADON FLUX FOR THE DETERS 1INATION Ol OCEANIC IvfIXING AND AIR -SEA GAS EXCHA NGE A Thesis by ROBERT I. EWIS BREWER Submitted to the Graduate College oi T e xa s A '4 I'. 1 Univ c r s i ty in partial... luiiillment of the requirement for the degree of KIASTER OF SCIENCE May 1977 Major Subject: Oceanography APPLICATIONS OF RADON DIS TBIBUTION AND RADON FLUX FOR THE DETERMINATION OF OCEANIC MIXING A ND AIR ? SEA GAS EXCIdA NGE A Thesis by ROBERT LEWIS...

Brewer, Robert Lewis

2012-06-07T23:59:59.000Z

84

Radon release and dispersion from an open pit uranium mine  

SciTech Connect (OSTI)

Radon-222 flux from representative sections of the United Nuclear St. Anthony open-pit mine complex was measured. The collected radon was adsorbed on activated charcoal and the radon activity was measured by gamma spectroscopy. System design, calibration, and the procedure to determine radon flux density (pCi/m/sup 2/.s) are described. A continuous series of radon flux densities were measured over a 5-month period at a control point in the mine. The average flux density at the control point was 1.9 pCi/m/sup 2/.s. A close correlation between radon flux density variations and changes in barometric pressure was observed by a comparison of meteorological data and average daily radon flux density measured at the control point. The release rate from each section of the mine was calculated from the average radon flux density and the area of the section, as determined from enlarged aerial photographs. The average radon flux density for eight locations over the ore-bearing section was 7.3 pCi/m/sup 2/.s. The average flux density for four locations over undisturbed topsoil was 0.17 pCi/m/sup 2/.s. The average Ra-226 content of ten samples taken from the ore-bearing region was 102 pCi/g ore. The ratio of radon flux density to radium content (specific flux) was 0.072. The release rate from the entire St. Anthony open pit was determined to be 3.5 x 10/sup 5/ pCi/s. This rate is comparable to the natural release of radon from one square mile of undisturbed topsoil. 16 refs., 31 figs., 11 tabs.

Kisieleski, W.E.

1980-06-01T23:59:59.000Z

85

Radon control systems in existing and new construction: a review  

Science Journals Connector (OSTI)

......home. In crawl spaces, the sheeting is...infiltration after construction. The results of...techniques in new construction are presented in...radon levels Crawl space Minimal Moderate...Modifications to heating, ventilation and...public and private sector radon mitigation......

Naureen Mahbub Rahman; Bliss L. Tracy

2009-08-01T23:59:59.000Z

86

Indoor radon problem in energy efficient multi-storey buildings  

Science Journals Connector (OSTI)

......Against Radon at Home and at Work Indoor radon problem in energy efficient multi-storey...amount of the total energy consumption in developed countries...approaches for designing energy-efficient buildings...registration of 1 h average value. Dwellers......

I. V. Yarmoshenko; A. V. Vasilyev; A. D. Onishchenko; S. M. Kiselev; M. V. Zhukovsky

2014-07-01T23:59:59.000Z

87

Follow-up study of indoor radon in Greek buildings  

Science Journals Connector (OSTI)

......Greece 3 Greek Atomic Energy Commission, Agia...the Greek Atomic Energy Commission (GAEC...exposure to radon in the home and workplace. It...m3 increase in the average radon concentration...the Greek Atomic Energy Commission (GAEC...increase in energy consumption from wood products......

A. Clouvas; S. Xanthos; M. Kolovou; C. Potiriadis; G. Takoudis; J. Guilhot

2013-12-01T23:59:59.000Z

88

Radon control systems in existing and new construction: a review  

Science Journals Connector (OSTI)

......intervals after remediation, perhaps once...radon in the ground can penetrate...buildings from ground water and from building...holes around the water or electricity...Another option for remediation in existing homes...drawn from the ground by thermal convection...non-pressurised ground water solved the radon......

Naureen Mahbub Rahman; Bliss L. Tracy

2009-08-01T23:59:59.000Z

89

Radiation and Radon from Natural Stone May 7, 2008  

E-Print Network [OSTI]

Radiation and Radon from Natural Stone May 7, 2008 W.J. Llope Rice University, Houston, TX 77005 is "radiation" and the other is "radon." Radioactive elements, by their very nature, seek stability by decaying the outside and cause damage to cells and DNA, potentially causing cancer. Also, naturally occurring Uranium

Llope, William J.

90

Indoor Dose Conversion Coefficients for Radon Progeny for Different  

E-Print Network [OSTI]

Indoor Dose Conversion Coefficients for Radon Progeny for Different Ambient Environments K . N . Y ambient environments on the indoor radon dose (in terms of the dose conversion coefficient or DCC of the human respiratory tract. Epidemiological studies of under- ground miners of uranium and other minerals

Yu, K.N.

91

Relation of Radon to Non-active Air Contamination  

Science Journals Connector (OSTI)

... Identification of the activity as radon products was obtained by tracing the decay through periods longer than two hours, and ... transmitted to that of a clean filter paper by a photoelectric densitometer. Although variations in radon over this period were considerably less (under a 20 to 1 maximum) than instances ...

C. D. THOMAS; M. K. GAINER; T. W. BALL

1955-04-23T23:59:59.000Z

92

Radon-222 Daughter Concentrations in Uranium Mine Atmospheres  

Science Journals Connector (OSTI)

... undertaken to measure the concentrations of 210Pb and 210Po in uranium mine atmospheres at various radon daughter concentration levels, and to determine the amount of 210Pb in the mine atmosphere ... atmosphere relative to that which would be produced from the decay of the short-lived radon daughters deposited in the lungs. Radium-226 was also measured in air so as ...

RICHARD L. BLANCHARD

1969-07-19T23:59:59.000Z

93

Determination of radon concentrations of the Dikili geothermal area in western turkey  

Science Journals Connector (OSTI)

......Figure 3 shows the average indoor radon concentrations...the Turkish Atomic Energy Commission for indoor...distribution of average indoor radon concentrations...Variation of the average indoor radon concentrations...and bottling, the consumption of interest in the...against radon-222 at home and at work, ICRP......

Y. Yarar; T. Günaydi; N. Çelebi

2006-04-01T23:59:59.000Z

94

The Austrian radon activities on the way to the national radon action plan  

Science Journals Connector (OSTI)

......radon concentration in water or air)-is listed...well as workplace on ground floor and basement level...building materials, water). A list of issues...type, measurement, remediation and prevention measures...situation (annual mean, ground floor, no basement......

V. Gruber; W. Ringer; G. Wurm; W. Haider

2014-07-01T23:59:59.000Z

95

The Austrian radon activities on the way to the national radon action plan  

Science Journals Connector (OSTI)

......AGES - Austrian Agency for Health and Food Safety, National...the OIB-3 guideline under dangerous immissions and refers to the...radon exposure and associated health risks(4), which is covered...within the Austrian Agency for Health and Food Safety (AGES......

V. Gruber; W. Ringer; G. Wurm; W. Haider

2014-07-01T23:59:59.000Z

96

National radon database documentation. Volume 5. The EPA/state residential radon surveys: Years 5 and 6. Final report 1986-1992  

SciTech Connect (OSTI)

The National Radon Database has been developed by the U.S. Environmental Protection Agency (EPA) to distribute information collected in two recently completed radon surveys: the EPA/State Residential Radon Surveys, Years 1 to 6; and The National Residential Radon Survey. The goals of the state radon surveys were twofold. Some measure of the distribution of radon levels among residences was desired for major geographic areas within each state and for each state as a whole. In addition, it was desired that each state survey would be able to identify areas of potentially high residential radon concentrations (hot spots) in the state, enabling the state to focus its attention on areas where indoor radon concentrations might pose a greater health threat. The document discusses year 5, 1990-91. The areas surveyed are: Arkansas; Illinois; Maryland; Eastern Cherokee Nation; Mississippi; Texas; and Washington.

Not Available

1993-01-01T23:59:59.000Z

97

lead-isotope dating  

Science Journals Connector (OSTI)

lead-isotope dating, lead-lead dating, lead-isotope age measurement, lead-lead age measurement ? Blei-Isotopen(-Alters)bestimmung, f, Blei-Isotopen-Datierung

2014-08-01T23:59:59.000Z

98

isotopic ratio | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

isotopic ratio isotopic ratio Leads No leads are available at this time. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a candidate...

99

Energy deposition and radiation quality of radon and radon daughters. Final report  

SciTech Connect (OSTI)

This program was aimed at creating a quantitative physical description, at the micrometer and nanometer levels, of the physical interactions of the alpha particles from radon and its daughters with cells at risk in the bronchial epithelium. The authors calculated alpha-particle energy spectra incident upon the cells and also energy deposition spectra in micrometer- and nanometer-sized sites as a function of cell depth, site size, airway diameter, activities of {sup 218}Po and {sup 214}Po, and other parameters. These data are now being applied, using biophysical models of radiation effects, to predict cell killing, mutations, and cell transformation. The model predictions are then compared to experimental biophysical, biochemical, and biological information. These studies contribute to a detailed understanding of the mechanisms of the biological effectiveness of the radiations emitted by radon and its progeny.

Karam, L.R.; Caswell, R.S.

1996-09-09T23:59:59.000Z

100

Radon in homes and other technologically enhanced radioactivity  

SciTech Connect (OSTI)

The results are described of recent observations at Argonne National Laboratory, contributing to our knowledge of such factors as the origin of high levels of radon in houses, its variability with time or otherwise, its uniformity throughout the house or otherwise, and the behavior and fate of the short-lived daughter-products. In a sample of 110 houses, mostly in the west suburban area of Chicago, 15% had radon concentrations in excess of 6 pCi litre/sup -1/ and 96% greater than 10 pCi litre /sup -1/. If this distribution is representative of all houses in the USA, the population being exposed to such high concentrations of radon is far greater than the number of people in Grand Junction being exposed to quite similar concentrations from technologically enhanced radioactivity. There is a great need for far more extensive data on radon in houses.

Rundo, J.; Toohey, R.E.

1983-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Exposure to radon in dwellings in the Sharri community, Kosovo  

Science Journals Connector (OSTI)

......major cause of lung cancer, second only to cigarette...course of prospecting for uranium between 1983 and 1989...because they were hit by depleted uranium projectiles during the...although no impact of depleted uranium on radon levels was......

M. Bahtijari; J. Vaupotic; A. Gregoric; P. Stegnar; I. Kobal

2008-06-01T23:59:59.000Z

102

History of the measurement of radon in central Bohemia  

Science Journals Connector (OSTI)

......is radium needles in depleted uranium shielding. The chamber's...Jerabek J. Lung cancer risk in relation to long-term...radiation exposure in uranium mines. Trnovec T...Holecek J. Study of lung cancer and residential radon......

Ivo Burian; Petr Otahal

2008-06-01T23:59:59.000Z

103

Measurement of indoor radon concentration in kindergartens in Sofia, Bulgaria  

Science Journals Connector (OSTI)

......significance of the overall factors for indoor radon concentration was tested by analysis of variance (ANOVA) and Kruskal-Wallis non-parametric test at a significance level of 95 %. Number of measurements, minimum, median, maximum, GM......

Kremena Ivanova; Zdenka Stojanovska; Martina Tsenova; Viktor Badulin; Bistra Kunovska

2014-11-01T23:59:59.000Z

104

Radon in context of natural radiation exposure: the Czech experience  

Science Journals Connector (OSTI)

......doses from ingestion of water are reasonably avertable...and intervention (remediation of existing exposure...effective dose caused by water containing 1000 Bq l1...radon concentrations in ground water vary from some Becquerel......

J. Hulka

2008-06-01T23:59:59.000Z

105

Effect of Irradiating the Tubercle Bacillus with Radon  

Science Journals Connector (OSTI)

... tubercle bacillus (1 mgm./c.c.) using the whole of the radiation of radon dissolved in the culture. The teclinique we have elaborated enables us to obtain reproducible ... -radiations aro negligible.) The following results are observed.

P. BONET-MAURY; H. R. OLIVIER

1939-11-11T23:59:59.000Z

106

Radon attenuation handbook for uranium mill tailings cover design  

SciTech Connect (OSTI)

This handbook has been prepared to facilitate the design of earthen covers to control radon emission from uranium mill tailings. Radon emissions from bare and covered uranium mill tailings can be estimated from equations based on diffusion theory. Basic equations are presented for calculating surface radon fluxes from covered tailings, or alternately, the cover thicknesses required to satisfy a given radon flux criterion. Also described is a computer code, RAECOM, for calculating cover thicknesses and surface fluxes. Methods are also described for measuring diffusion coefficients for radon, or for estimating them from empirical correlations. Since long-term soil moisture content is a critical parameter in determining the value of the diffusion coefficient, methods are given for estimating the long-term moisture contents of soils. The effects of cover defects or advection are also discussed and guidelines are given for determining if they are significant. For most practical cases, advection and cover defect effects on radon flux can be neglected. Several examples are given to demonstrate cover design calculations, and an extensive list of references is included. 63 references, 18 figures, 6 tables.

Rogers, V.C.; Nielson, K.K.; Kalkwarf, D.R.

1984-04-01T23:59:59.000Z

107

Indoor and soil gas radon simultaneous measurements for the purpose of detail analysis of radon entry pathways into houses  

Science Journals Connector (OSTI)

......on the modification of the standard BD method described in detail...concentration is variable during the standard indoor measurement campaign...symmetric against each other and standard indoor radon measurement...householder activities, including HVAC (heating, ventilation and......

A. Fronka

2011-05-01T23:59:59.000Z

108

Isotope Science and Production  

E-Print Network [OSTI]

of Energy National Isotope Program http://www.nuclear.energy.gov/isotopes/nelsotopes2a.html Isotopes for Environmental Science Isotopes produced at Los Alamos National Laboratory are used as environmental tracers change and its effects. Los Alamos National Laboratory can produce Si-32 needed for oceanographic tracing

109

Stable isotope studies  

SciTech Connect (OSTI)

The research has been in four general areas: (1) correlation of isotope effects with molecular forces and molecular structures, (2) correlation of zero-point energy and its isotope effects with molecular structure and molecular forces, (3) vapor pressure isotope effects, and (4) fractionation of stable isotopes. 73 refs, 38 figs, 29 tabs.

Ishida, T.

1992-01-01T23:59:59.000Z

110

Indoor Radon and Its Decay Products: Concentrations, Causes, and Control Strategies  

E-Print Network [OSTI]

Radon and Its Decay Products in Indoor Air, Wiley, New York.radon daughter products in indoor air, Radiat. Prot. Dosim..and their decay products in indoor air, Health Phys. , 34,

Nero, A.V.

2008-01-01T23:59:59.000Z

111

Incidence characteristics of alpha particles on detectors irradiated in a radon progeny atmosphere  

E-Print Network [OSTI]

regarding short-lived radon prog- eny has attracted much attention in the field of radon dosimetry. Nuclear state nuclear track detectors (SSNTDs). Here, we should mention the double detector method, in which one

Yu, K.N.

112

Protection from radon exposure at home and at work in the directive 2013/59/Euratom  

Science Journals Connector (OSTI)

......RL for (annual average) radon concentration...as an annual average) exceeding the...as programmes on energy saving and indoor...due to tobacco consumption, energy saving and other...et al. Radon in homes and lung cancer......

F. Bochicchio

2014-07-01T23:59:59.000Z

113

Indoor radon in rural dwellings of the South-Pannonian region  

Science Journals Connector (OSTI)

......are possibly due to the uranium content of deep underground...Lj. Simple method for depleted uranium determination. Jpn J...underestimate the radon-related health risk. The elevated radon...explained by elevated uranium levels of surface soil......

S. Forkapic; I. Bikit; J. Slivka; Lj. Conkic; M. Veskovic; N. Todorovic; E. Varga; D. Mrda; E. Hulber

2007-02-01T23:59:59.000Z

114

THE EFFECT OF RADON TRANSPORT IN GROUNDWATER UPON GAMMA-RAY BOREHOLE LOGS  

E-Print Network [OSTI]

Estimation of the Lung Tissue Dose from Inhalation of Radon and Daughters," Health Physics 10, 1137 Federal Radiation

Nelson, P.H.

2010-01-01T23:59:59.000Z

115

Rectangular discrete radon transform for buildings extraction from high resolution satellite images  

Science Journals Connector (OSTI)

This paper presents a new approach titled Rectangular Discrete Radon Transform (RDRT) which is based on the generalization of the classical Radon transform to project the images with rectangular objects instead of straight lines. The RDRT was conceived ... Keywords: high resolution satellite image, rectangular buildings, rectangular discrete radon transform

Elouedi Ines; Hamouda Atef; Rojbani Hmida

2012-06-01T23:59:59.000Z

116

1) Title of the paper: Lossless Compression Based on a Discrete and Exact Radon Transform: A  

E-Print Network [OSTI]

the difference between several sim- ilar finite Radon projections. Two differential encoding tech- niques are needed to efficiently encode the Radon trans- formed data. An intra-projection encoding technique in such projections. The second step consists in encoding the similarities between Radon projections

Autrusseau, Florent

117

DTW for Matching Radon Features: A Pattern Recognition and Retrieval Method  

E-Print Network [OSTI]

. This allows to exploit the Radon property to include both boundary as internal structure of shapes, whileDTW for Matching Radon Features: A Pattern Recognition and Retrieval Method Santosh K.C.1 , Bart. It is basically based on dynamic programming for matching the Radon features. The key char- acteristic

Boyer, Edmond

118

Isotopically pumped isotopic CF4 laser  

Science Journals Connector (OSTI)

Single-mode optical pumping of CF4 to generate 16-µm frequencies has been extended to include the isotopic species 12CF4,...

Eckhardt, Roger; Telle, John; Haynes, Larry

1982-01-01T23:59:59.000Z

119

Seasonal variation of radon concentrations in UK homes  

Science Journals Connector (OSTI)

The patterns of seasonal variation of radon concentrations were measured in 91 homes in five regions of the UK over a period of two years. The results showed that there was no significant difference between the regions in the pattern or magnitude of seasonal variation in radon concentrations. The arithmetic mean variation was found to be close to that found previously in the UK national survey. Differences in the pattern between the two years of the study were not significant. Two-thirds of homes in the study followed the expected pattern of high radon in the winter and low radon in the summer. Most of the rest showed little seasonal variation, and a few showed a reversed seasonal pattern. The study does not provide any clear evidence for the recorded house characteristics having an effect on the seasonal variation in radon concentrations in UK homes, though the statistical power for determining such effects is limited in this study. The magnitude of the seasonal variation varied widely between homes. Analysis of the individual results from the homes showed that because of the wide variation in the amount of seasonal variation, applying seasonal correction factors to the results of three-month measurements can yield only relatively small improvements in the accuracy of estimates of annual mean concentrations.

J C H Miles; C B Howarth; N Hunter

2012-01-01T23:59:59.000Z

120

Isotope Geothermometry | Open Energy Information  

Open Energy Info (EERE)

Isotope Geothermometry Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Isotope Geothermometry Details Activities (0) Areas (0) Regions (0)...

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

THE ISOTOPES OF AMERICIUM  

E-Print Network [OSTI]

spectrographic analysis of the americium samples. It is a48 J'---_I" THE ISOTOPES OF AMERICIUM K. Street, Jr. , A.Elements THE ISOTOPES OF AMERICIUM K. Street, Jr. , A.

Street, K.; Ghiroso, A.; Seaborg, G.T.

2008-01-01T23:59:59.000Z

122

Assessment of the Exposure to and Dose from Radon Decay Products in Normally Occupied Homes  

Science Journals Connector (OSTI)

Assessment of the Exposure to and Dose from Radon Decay Products in Normally Occupied Homes ... In homes supplied by water with a high radon content, inhalation exposure from the radon in the water may occur on two different time scales: (a) long-term exposure that occurs due to an increase in the background radon concentration from radon released ... ... Experimental Assessment of the Short- and Long-Term Effects of 222Rn from Domestic Shower Water on the Dose Burden Incurred in Normally Occupied Homes ...

Philip K. Hopke; Bent. Jensen; Chih-Shan. Li; Nathalie. Montassier; Piotr. Wasiolek; Alfred J. Cavallo; Kenneth. Gatsby; Robert H. Socolow; Anthony C. James

1995-05-01T23:59:59.000Z

123

Electrochemical Isotope Effect and Lithium Isotope Separation  

Science Journals Connector (OSTI)

In a series of papers Kavner et al. (2005, 2008)(2, 3) derive an equation predicting isotopic fractionation due to an electrochemical isotope effect (?EIE), defined by the ratio of electron transfer rates (k?/k) for isotopically substituted species (prime for heavy isotopologues): where v, ?G, kB, T, m, ?eq, QP/QR, z, e, and ? denote collision frequency, activation free energy, Boltzmann’s constant, temperature, mass in motion, equilibrium fractionation factor, partition function ratio of abundant isotopologues of product (P) and reactant (R), number of electrons, charge of electron, and Marcus reorganization energy, respectively. ... fractional isotope evolution of Zn isotopes during an electroplating process which stepwise removes most of the Zn from the aq. ...

Jay R. Black; Grant Umeda; Bruce Dunn; William F. McDonough; Abby Kavner

2009-07-06T23:59:59.000Z

124

Perchlorate Isotope Forensics  

Science Journals Connector (OSTI)

In this study, comprehensive stable isotope analyses (37Cl/35Cl and 18O/17O/16O) of perchlorate from known synthetic and natural sources reveal systematic differences in isotopic characteristics that are related to the formation mechanisms. ... ?37Cl and ?18O are measures of mass-dependent fractionation of Cl and O isotopes by normal physical, chemical, or biological processes. ...

John Karl Böhlke; Neil C. Sturchio; Baohua Gu; Juske Horita; Gilbert M. Brown; W. Andrew Jackson; Jacimaria Batista; Paul B. Hatzinger

2005-11-04T23:59:59.000Z

125

Isotope Effect in Adhesion  

Science Journals Connector (OSTI)

Isotope Effect in Adhesion ... We report the first observation of an isotope effect in adhesion. ... The results are presented in Figure 3. Clearly, the isotope effect is very significant, substantiating the proposed H-bonding interactions between the PDMS and Si?OH(D) surfaces. ...

Gun Young Choi; Abraham Ulman; Yitzhak Shnidman; Walter Zurawsky; Cathy Fleischer

2000-05-25T23:59:59.000Z

126

Determination of Airborne Fission Product Radioactivity using Gamma-Ray Spectrometry  

Science Journals Connector (OSTI)

... portion thereof by means of an end-window Geiger-Miiller counter or other suitable detector. Radon and thoron along with their radioactive daughter products are universally present in surface air in ... determine airborne fission product radioactivity it is necessary to differentiate it from that arising from radon and thoron daughters. The concentration of ...

P. F. GUSTAFSON; S. S. BRAR; U. C. MISHRA

1962-08-11T23:59:59.000Z

127

ARM - Measurement - Isotope ratio  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

govMeasurementsIsotope ratio govMeasurementsIsotope ratio ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Isotope ratio Ratio of stable isotope concentrations. Categories Atmospheric Carbon, Atmospheric State Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments FLASK : Flask Samplers for Carbon Cycle Gases and Isotopes Field Campaign Instruments FLASK : Flask Samplers for Carbon Cycle Gases and Isotopes Datastreams FLASK : Flask Samplers for Carbon Cycle Gases and Isotopes

128

Isotope Program Transportation | Department of Energy  

Office of Environmental Management (EM)

Isotope Program Transportation Isotope Program Transportation Isotope Program Transportation More Documents & Publications Nuclear Fuel Storage and Transportation Planning Project...

129

Indoor radon concentrations in the town of Niksic, Montenegro  

Science Journals Connector (OSTI)

......ac.yu 1 Faculty of Natural Sciences and Mathematics...filter, which allows radon gas to enter the chamber volume...ranges from 7 Bq m3 (Cyprus) to 120 Bq m3 (Albania...283-291. Monograph Rare Gas Geochemistry - Applications...Montenegro. | Faculty of Natural Sciences and Mathematics......

N. Antovic; P. Vukotic; R. Zekic; R. Ilic

2007-05-01T23:59:59.000Z

130

Achievements and current activities of the Canadian radon program  

Science Journals Connector (OSTI)

......territorial governments to review the Canadian radon...of practices and standards for radiation protection...Quality assurance plans have been established...the USA and the Standards Council of Canada...2008 to develop a standard protocol for mapping...such as ground uranium concentration from......

Jing Chen; Ken Ford; Jeff Whyte; Kelley Bush; Deborah Moir; Jack Cornett

2011-07-01T23:59:59.000Z

131

Dennis, Eberhart, Dulikravich & Radons FINITE ELEMENT SIMULATION OF COOLING  

E-Print Network [OSTI]

). The simulations performed in this study consider ice packs applied to head and neck as well as using a head-cooling1 Dennis, Eberhart, Dulikravich & Radons FINITE ELEMENT SIMULATION OF COOLING OF REALISTIC 3-D Rapid cooling of the brain in the first minutes following the onset of cerebral ischemia

Dennis, Brian

132

Indoor radon problem in energy efficient multi-storey buildings  

Science Journals Connector (OSTI)

......estimated. INTRODUCTION The problems of energy saving and energy efficiency are in the spotlight of society. Buildings account for a...percentile exceeds 10 and only in one room it is 4. In each house, the minimal registered radon concentration drops below......

I. V. Yarmoshenko; A. V. Vasilyev; A. D. Onishchenko; S. M. Kiselev; M. V. Zhukovsky

2014-07-01T23:59:59.000Z

133

Radon control systems in existing and new construction: a review  

Science Journals Connector (OSTI)

......maintenance. In the active/passive house ventilation system, natural...unique characteristics of each house, the level of radon, the...soil gases as well, increases energy efficiency, uses a passive system that...walls before it can enter the house (wall suction) or blows air......

Naureen Mahbub Rahman; Bliss L. Tracy

2009-08-01T23:59:59.000Z

134

Distillation purification and radon assay of liquid xenon  

SciTech Connect (OSTI)

We succeeded to reduce the Kr contamination in liquid xenon by a factor of 1/1000 with a distillation system in Kamioka mine. Then, the remaining radioactivities (Radon and Kr) in purified liquid xenon were measured with the XMASS prototype detector. In this talk, the distillation system and the remaining internal radioactivity levels are reported.

Takeuchi, Yasuo [Kamioka Observatory, ICRR, Univ. of Tokyo, Kamioka-cho, Hida-shi, Gifu 506-1205 (Japan)

2005-09-08T23:59:59.000Z

135

Long-Term Observations of Indoor and Outdoor Radon Concentrations  

Science Journals Connector (OSTI)

......Radiation Protection Dosimetry Article Long-Term Observations of Indoor and Outdoor...Lapere Two sets of data obtained by long-term observations of radon concentration...phosphogypsum was used. Around a nuclear waste storage place containing radium, 22 dosemeters......

J. Uyttenhove; R. Lapere

1988-08-01T23:59:59.000Z

136

Radon control systems in existing and new construction: a review  

Science Journals Connector (OSTI)

......air-tightness of a home. The quantities...estimates of the total average radon entry rate...buildings due to energy saving measures or...measures are costs, energy consumption, incomplete diagnostic...process. Surveys among home-owners could provide......

Naureen Mahbub Rahman; Bliss L. Tracy

2009-08-01T23:59:59.000Z

137

The history of radon from a Swedish perspective  

Science Journals Connector (OSTI)

......increase when saving energy by decreasing...rate during the energy crisis in 1974...The country-averages of the indoor...representative sampling of consumption water in Sweden...recommendations of 1993 for homes and workplaces...regarding the averages, with radon...is unfit for consumption. More than 100......

Gun Astri Swedjemark

2004-07-01T23:59:59.000Z

138

The newest international trend about regulation of indoor radon  

Science Journals Connector (OSTI)

......AL of 400 Bq m3 for above-ground workplaces and an AL in the...soil, building materials or water. A list of elements to be...100-200(18) aAbove-ground workplaces. bUnderground workplaces...RADPAR-Radon Prevention and Remediation, grant agreement No. 20081217......

Francesco Bochicchio

2011-07-01T23:59:59.000Z

139

Content based image hashing via wavelet and radon transform  

Science Journals Connector (OSTI)

Image hash function based on the image content has applications in watermarking, authentication and image retrieval. This paper presents an algorithm for generating an image hash that is robust against content-preserving modifications and at the same ... Keywords: image hashing, radon transform, wavelet transform

Xin C. Guo; Dimitrios Hatzinakos

2007-12-01T23:59:59.000Z

140

Spherical radon transforms and mathematical problems of thermoacoustic tomography  

E-Print Network [OSTI]

The spherical Radon transform (SRT) integrates a function over the set of all spheres with a given set of centers. Such transforms play an important role in some newly developing types of tomography as well as in several areas of mathematics...

Ambartsoumian, Gaik

2009-06-02T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Radon releases from Australian uranium mining and milling projects: assessing the UNSCEAR approach  

Science Journals Connector (OSTI)

The release of radon gas and progeny from the mining and milling of uranium-bearing ores has long been recognised as a potential radiological health hazard. The standards for exposure to radon and progeny have decreased over time as the understanding of their health risk has improved. In recent years there has been debate on the long-term releases (10,000 years) of radon from uranium mining and milling sites, focusing on abandoned, operational and rehabilitated sites. The primary purpose has been estimates of the radiation exposure of both local and global populations. Although there has been an increasing number of radon release studies over recent years in the USA, Australia, Canada and elsewhere, a systematic evaluation of this work has yet to be published in the international literature. This paper presents a detailed compilation and analysis of Australian studies. In order to quantify radon sources, a review of data on uranium mining and milling wastes in Australia, as they influence radon releases, is presented. An extensive compilation of the available radon release data is then assembled for the various projects, including a comparison to predictions of radon behaviour where available. An analysis of cumulative radon releases is then developed and compared to the UNSCEAR approach. The implications for the various assessments of long-term releases of radon are discussed, including aspects such as the need for ongoing monitoring of rehabilitation at uranium mining and milling sites and life-cycle accounting.

Gavin M. Mudd

2008-01-01T23:59:59.000Z

142

Mass-Independent Isotope Effects  

Science Journals Connector (OSTI)

Scientific interests: ESR and NMR spectroscopies, molecular magnets, mechanisms of chemical and biochemical reactions, spin physics and chemistry, isotopes and isotope effects in chemistry and biochemistry. ... Another mass-independent isotope effect was detected in 1983 as a deviation of isotopic distribution in reaction products from that which would be expected from the mass-dependent isotope effect. ... Later, Nomura et al.(92) have found isotopic 233U anomaly in the U4+–U6+ exchange reaction; they noted that the isotope effect was correlated with isotope shifts in the atomic spectra of uranium isotopes. ...

Anatoly L. Buchachenko

2013-01-09T23:59:59.000Z

143

Hybrid isotope separation scheme  

DOE Patents [OSTI]

A method is described for yielding selectively a desired enrichment in a specific isotope including the steps of inputting into a spinning chamber a gas from which a scavenger, radiating the gas with a wave length or frequency characteristic of the absorption of a particular isotope of the atomic or molecular gas, thereby inducing a photochemical reaction between the scavenger, and collecting the specific isotope-containing chemical by using a recombination surface or by a scooping apparatus. 2 figures.

Maya, J.

1991-06-18T23:59:59.000Z

144

Hybrid isotope separation scheme  

DOE Patents [OSTI]

A method of yielding selectively a desired enrichment in a specific isotope including the steps of inputting into a spinning chamber a gas from which a scavenger, radiating the gas with a wave length or frequency characteristic of the absorption of a particular isotope of the atomic or molecular gas, thereby inducing a photochemical reaction between the scavenger, and collecting the specific isotope-containing chemical by using a recombination surface or by a scooping apparatus.

Maya, Jakob (Brookline, MA)

1991-01-01T23:59:59.000Z

145

A Prototype Radon Filter for Air A typical, recurring problem in low-background physics is the contamination of sensitive  

E-Print Network [OSTI]

is the contamination of sensitive surfaces of experimental apparata with the radioactive decay products of 222Rn . What since all its daughters are short-lived and decay away in a few days (see the 232Th radioactive chain.1: The 232Th natural radioactive chain. Diffusion of thoron (220Rn) and plate out of its daughters doesn

146

Stable isotope enrichment  

SciTech Connect (OSTI)

Brian Egle is working to increase the nation's capacity to produce stable isotopes for use including medicine, industry and national security.

Egle, Brian

2014-07-14T23:59:59.000Z

147

EMSL - isotopic ratio  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

isotopic-ratio en Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. http:www.emsl.pnl.govemslwebpublicationsmagnesium-behavior-and-structural-def...

148

Radon flux measurements on Gardinier and Royster phosphogypsum piles near Tampa and Mulberry, Florida  

SciTech Connect (OSTI)

As part of the planned Environmental Protection Agency (EPA) radon flux monitoring program for the Florida phosphogypsum piles, Pacific Northwest Laboratory (PNL), under contract to the EPA, constructed 50 large-area passive radon collection devices and demonstrated their use at two phosphogypsum piles near Tampa and Mulberry, Florida. The passive devices were also compared to the PNL large-area flow-through system. The main objectives of the field tests were to demonstrate the use of the large-area passive radon collection devices to EPA and PEI personnel and to determine the number of radon flux measurement locations needed to estimate the average radon flux from a phosphogypsum pile. This report presents the results of the field test, provides recommendations for long-term monitoring, and includes a procedure for making the radon flux measurements.

Hartley, J.N.; Freeman, H.D.

1986-01-01T23:59:59.000Z

149

The effectiveness of radon preventive and remedial measures in Irish homes  

Science Journals Connector (OSTI)

It is estimated that approximately 100?000 Irish homes have radon concentrations above the reference level of 200 Bq m?3. To minimise the number of new homes with this problem, building regulations require that all new homes built since July 1998 in high radon areas are installed with radon barriers during construction. Measurements on local authority homes in a number of high radon areas have allowed the impact of these new regulations to be assessed. In County Cork a reduction of up to 70% in the mean radon concentration was observed in homes built since 1998 relative to those built before this date. A reduction in both the number of homes exceeding the reference level and the maximum concentration measured in homes was also measured. Homes exceeding the reference level were remediated with the use of an active sump. The results of this remedial work are also presented and show that the mean reduction in radon concentration achieved was 92%.

S Long; D Fenton; M Cremin; A Morgan

2013-01-01T23:59:59.000Z

150

Radon Progeny as a experimental tool for dosimetry of nanoaerosols  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Radon Progeny as a experimental tool for dosimetry of nanoaerosols Radon Progeny as a experimental tool for dosimetry of nanoaerosols Title Radon Progeny as a experimental tool for dosimetry of nanoaerosols Publication Type Journal Article LBNL Report Number LBNL-117E Year of Publication 2009 Authors Ruzer, Lev S., and Michael G. Apte Journal Radiation Biology. Radioecology (Russian) Volume 49 Start Page Chapter Issue 3 Pagination 395-404 Other Numbers LBNL-117E Abstract The study of aerosol exposure and dosimetry measurements and related quantitation of health effects are important to the understanding of the consequences of air pollution, and are discussed widely in the scientific literature. During the last 10 years the need to correlate aerosol exposure and biological effects has become especially important due to rapid development of a new, revolutionary industry - nanotechnology. Nanoproduct commerce is predicted to top $1 trillion by 2015. Quantitative assessment of aerosol particle behavior in air and in lung deposition, and dosimetry in different parts of the lung, particularly for nanoaerosols, remains poor despite several decades of study. Direct measurements on humans are still needed in order to validate the hollow cast, animal studies, and lung deposition modeling. We discuss here the use of nanoscale radon decay products as an experimental tool in the study of local deposition and lung dosimetry for nanoaerosols. The issue of the safe use of radon progeny in such measurements is discussed based on a comparison of measured exposure in 3 settings: general population, miners, and in a human experiment conducted at the Paul Scherer Institute (PSI) in Switzerland. One of the properties of radon progeny is that they consist partly of 1 nm radioactive particles called unattached activity; having extremely small size and high diffusion coefficients, these particles can be potentially useful as radioactive tracers in the study of nanometer-sized aerosols. We present a theoretical and experimental study of the correlation between the unattached activity and aerosol particle surface area, together with a description of its calibration and method for measurement of the unattached fraction

151

Unattached radon progeny as an experimental tool for dosimetry of  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Unattached radon progeny as an experimental tool for dosimetry of Unattached radon progeny as an experimental tool for dosimetry of nanoaerosols: Proposed method and research strategy Title Unattached radon progeny as an experimental tool for dosimetry of nanoaerosols: Proposed method and research strategy Publication Type Journal Article LBNL Report Number LBNL-117E Year of Publication 2010 Authors Ruzer, Lev S., and Michael G. Apte Journal Inhalation Toxicology Volume 22 Pagination 760-766 Abstract The study of aerosol exposure and dosimetry measurements and related quantitation of health effects are important to the understanding of the consequences of air pollution, and are discussed widely in the scientific literature. During the last 10 years the need to correlate aerosol exposure and biological effects has become especially important due to rapid development of a new, revolutionary industry - nanotechnology. Nanoproduct commerce is predicted to top $1 trillion by 2015. Quantitative assessment of aerosol particle behavior in air and in lung deposition, and dosimetry in different parts of the lung, particularly for nanoaerosols, remains poor despite several decades of study. Direct measurements on humans are still needed in order to validate the hollow cast, animal studies, and lung deposition modeling. We discuss here the use of nanoscale radon decay products as an experimental tool in the study of local deposition and lung dosimetry for nanoaerosols. The issue of the safe use of radon progeny in such measurements is discussed based on a comparison of measured exposure in 3 settings: general population, miners, and in a human experiment conducted at the Paul Scherer Institute (PSI) in Switzerland. One of the properties of radon progeny is that they consist partly of 1 nm radioactive particles called unattached activity; having extremely small size and high diffusion coefficients, these particles can be potentially useful as radioactive tracers in the study of nanometer-sized aerosols. We present a theoretical and experimental study of the correlation between the unattached activity and aerosol particle surface area, together with a description of its calibration and method for measurement of the unattached fraction

152

E-Print Network 3.0 - au radon gaz Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

est gal au rapport des intensits du tube de radon... place au milieu d'un tube Fis. 2. Une enveloppe ... Source: Ecole Polytechnique, Centre de mathmatiques Collection:...

153

E-Print Network 3.0 - atmospheric radon-222 concentration Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1. Radon-222... concentrations in air include ... Source: Baskaran, Mark - Department of Geology, Wayne State University Collection: Geosciences ; Chemistry 30 1.0 MAJOR STUDIES...

154

National Radon Database. Volume 5. The EPA/state residential radon surveys: AR, IL, MD, MT, MS, TX, VA, WA and the Eastern Cherokee Nation, 1990-1992 (5 1/4 inch 1. 2mb) (for microcomputers). Data file  

SciTech Connect (OSTI)

The National Radon Database (NRDB) was developed by the United States Environmental Protection Agency (USEPA) to distribute information in two recent radon surveys: the EPA/State Residential Radon Surveys and the National Residential Radon Survey. The National Residential Radon Surveys collected annual average radon measurements on all levels of approximately 5,700 homes nationwide. Information collected during survey includes a detailed questionnaire on house characteristics, as well as radon measurements. The radon survey data for Volume 6 is contained on two diskettes. The data diskettes are accompanied by comprehensive documentation on the design and implementation of the survey, the development and use of sampling weights, a summary of survey results, and information concerning the household questionnaire.

Not Available

1992-01-01T23:59:59.000Z

155

National Radon Database. Volume 5. The EPA/state residential radon surveys: AR, IL, MD, MT, MS, TX, VA, WA, and the Eastern Cherokee Nation, 1990-1992 (3 1/2 inch, 1. 44mb) (for microcomputers). Data file  

SciTech Connect (OSTI)

The National Radon Database (NRDB) was developed by the United States Environmental Protection Agency (USEPA) to distribute information in two recent radon surveys: the EPA/State Residential Radon Surveys and the National Residential Radon Survey. The National Residential Radon Surveys collected annual average radon measurements on all levels of approximately 5,700 homes nationwide. Information collected during survey includes a detailed questionnaire on house characteristics, as well as radon measurements. The radon survey data for Volume 6 is contained on two diskettes. The data diskettes are accompanied by comprehensive documentation on the design and implementation of the survey, the development and use of sampling weights, a summary of survey results, and information concerning the household questionnaire.

Not Available

1992-01-01T23:59:59.000Z

156

Celebrating The Isotope  

Science Journals Connector (OSTI)

Celebrating The Isotope ... The notion of isotopes and the rest of Soddy’s lifetime body of work on radioactivity, the group displacement laws, the social responsibility of scientists, and the environment have had a profound effect on science and society. ...

GEORGE B. KAUFFMAN

2013-12-02T23:59:59.000Z

157

Isotope - based Quantum Information  

E-Print Network [OSTI]

This paper is brief review of three aspects of the isotope - based quantum information: computation, teleportation and cryptography. Our results demonstrate not only that entanglement exists in elementary excitation of isotope - mixed solids but also it can be used for quantum information processing.

Vladimir G. Plekhanov

2009-09-04T23:59:59.000Z

158

Technical Report No.7, Investigation of radon and helium as possible fluid-phase precursors to earthquakes. Technical Report No. 2, Additional task: Radon, helium and geochemical monitoring on the Palmdale uplift.  

E-Print Network [OSTI]

Imperial Valley) HELIUM AND All with RADON IN WELL SAMPLES of the wells in the Southern Network are geothermal

Craig, H; Lupton, J E; Chung, Y; Horowitz, R M

1977-01-01T23:59:59.000Z

159

Influence of energy-saving measures on the radon concentration in some kindergartens in the Czech Republic  

Science Journals Connector (OSTI)

......Radon at Home and at Work Influence of energy-saving...obtain the average activity...current energy consumption standards...that recent energy-saving...long-term average indoor radon...et al. Home energy efficiency......

I. Fojtikova; K. Navratilova Rovenska

2014-07-01T23:59:59.000Z

160

A study of radon-222 concentrations in North Carolina groundwater  

SciTech Connect (OSTI)

The groundwater of 400 North Carolina homes was sampled to ascertain the distribution and extent of {sup 222}Rn in North Carolina groundwater. Arithmetic mean (AM) and geometric mean (GM) concentrations of 1,816 pCi L{sup {minus}1} and 656 pCi L{sup {minus}1} were found for the state. These results indicate that two-thirds of 114{degree}C. homes served by groundwater exceed the EPA proposed 300 pCi L{sup {minus}1} maximum contaminant level (MCL). Only 2% of NC homes exceeded 10,000 pCi L-1. The Eastern region had the lowest radon concentrations by far, with a GM of 2-)0 pCi L{sup {minus}1}. The Central region and Western region had GM`s of 794 pCi L{sup {minus}1} and 1,032 pCi L{sup {minus}1} respectively. The groundwater data approached a log normal distribution. No consistent trends were noted in the relationship between indoor radon concentrations and groundwater radon concentrations. A correlation coefficient of 0.00921 revealed a very weak linear relationship.

Evans, J.P.

1992-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Radon emanation measurement using French and Russian track detectors  

Science Journals Connector (OSTI)

This paper presents the first results of a new Franco-Russian project: the International Centre for Radon Expertise (I.C.R.E.). The objectives of this center include determining the sources and contents of natural radioactive gases and their radioactive daughters in order to provide protection against radiation for the population and the environment, and trace the migration of radioactive elements in the soil and plants. Passive radon measurement techniques developed in France and in Russia have been used together to conduct preliminary studies. The results of a comparison of the two techniques, applied both in laboratory and outdoors, are also presented. In order to develop the one passive technique that will be used in future studies, the possibility of optimization using various French and Russian detectors has been investigated. Attempts have been made to compare the response of original measurement cells with nuclear track detectors. Comparisons of such track detector responses have been performed at the university of Franche-Comte in France using various radon environmental conditions (atmospheric gas, soil gas and in water).

D Klein; V Pautov; A Chambaudet; G Barenboim

1995-01-01T23:59:59.000Z

162

A modelling methodology for the analysis of radon potential based on environmental geology and geographically weighted regression  

Science Journals Connector (OSTI)

Many countries have promoted environmental studies and established national radon programmes in order to identify those geographical areas where high indoor exposure risk of people to this radioactive gas are more likely to be found (often referred to ... Keywords: Environmental geology, Environmental radon potential modelling, Geographically Weighted Regression, Geostatistic, Indoor radon, Local spatial effect

Antonio Pasculli; Sergio Palermi; Annalina Sarra; Tommaso Piacentini; Enrico Miccadei

2014-04-01T23:59:59.000Z

163

Soil gas radon measurements in a region of the Bohemian Massif: investigations in the framework of an Austrian pilot study  

Science Journals Connector (OSTI)

......AGES - Austrian Agency for Health and Food Safety, Competence...the Austrian population. The health effects of indoor radon have...radon concentrations may be dangerous(2). Most people are exposed...According to the WHO, the actual health risk of indoor radon was underestimated......

Claudia Seidel; Andreas Baumgartner; Wolfgang Ringer; Joachim Gräser; Harry Friedmann; Heribert Kaineder; Franz Josef Maringer

2011-05-01T23:59:59.000Z

164

Development and management of a radon assessment strategy suitable for underground railway tunnelling projects  

Science Journals Connector (OSTI)

......annum for the duration of each project. INTRODUCTION The construction...best practice at the time of project development and for tunnelling...national authorities are at liberty to choose a different (lower...throughout the duration of the project. Pylon radon gas and radon......

C. J. Purnell; G. Frommer; K. Chan; A. A. Auch

2004-04-01T23:59:59.000Z

165

Monitoring trends in civil engineering and their effect on indoor radon  

Science Journals Connector (OSTI)

......Against Radon at Home and at Work Monitoring...discussed. The effect of energy-efficient construction...high radon levels in energy-efficient new houses...level of 26 % in average. Among the various...for such trends are energy-efficient construction...the overall energy consumption. New building concepts......

W. Ringer

2014-07-01T23:59:59.000Z

166

IMPLEMENTATION OF THE NEW INTERNATIONAL STANDARDS IN SWISS LEGISLATION ON RADON PROTECTION IN DWELLINGS  

Science Journals Connector (OSTI)

......is to be given to the remediation of new builds that fail...prevent the entry of water, water steam and radon. It...direct contact with the ground or with a dirt-floor...Proportionality of radon remediation The switch from a limit......

Martha Palacios (Gruson); Fabio Barazza; Christophe Murith; Salome Ryf

2014-10-01T23:59:59.000Z

167

Radon impact in patients with broncho-pulmonary cancer in centre areas of Transylvania  

Science Journals Connector (OSTI)

Lung cancer is the most frequent cause of mortality caused by malignancies in the world. Radon, the second recognized carcinogenic agent involved in the development of lung cancer, after smoking, is a noble gas with a high mobility. By being continuously ... Keywords: lung cancer, morpho-pathological type of the lung cancer, prevention, radon, smoking, smoking cessation

Doina Adina Todea; Constantin Cosma; Loredana Elena Rosca; Andreea Cristina Herescu; Tiberius Dicu; Natalia Neagoe

2009-09-01T23:59:59.000Z

168

Journal of Hazardous Materials 132 (2006) 98110 Assessment of environmental radon hazard using human  

E-Print Network [OSTI]

. Dosimetric calculations gave a dose conversion coefficient of 15 mSv/WLM, which is higher than the value 5 m rights reserved. Keywords: Radon; Radon progeny; Human respiratory tract; Dose conversion coefficient serve as an indicator of underground uranium ores. It can also pass the surface between the soil

Yu, K.N.

169

Estimate of risk from environmental exposure to radon-222 and its decay products  

Science Journals Connector (OSTI)

... principal ways in which members of the public receive natural irradiation is by breathing the radon-222 decay products in air. ... -222 decay products in air. Radon gas is emitted by soil, rocks and building materials, all of which contain the ...

R. D. Evans; J. H. Harley; W. Jacobi; A. S. McLean; W. A. Mills; C. G. Stewart

1981-03-12T23:59:59.000Z

170

Meteorological Conditions Dependence of Radon Concentration in the Air above the Atlantic Ocean  

Science Journals Connector (OSTI)

... very likely to happen in June, and, finally, we have connected the concentration of radon and of its descendants to the origin of the air masses, for the air ... If the air comes from the north-west of France or from Great Britain, its radon concentration is always between 10 and 27 pc./m3; the mean speed wind blowing ...

J. FONTAN; D. BLANC; A. BOUVILLE; J. LACAZE

1963-02-09T23:59:59.000Z

171

Use of Radon to Trace the Flow Pattern of Gases in Furnaces  

Science Journals Connector (OSTI)

... cm.) has shown that the method is quite practicable. A 20 millicurie sample of radon was mixed with air in a gas-holder of about 350 litres capacity, and ... 4,000 litres per min. The aperture was of such size as to give the radon-air about the same linear velocity as the main stream. Samples of the gas ...

R. MAYORCAS; M. W. THRING

1943-12-18T23:59:59.000Z

172

Concentrations of Radon-222 in Coal Mines in England and Scotland  

Science Journals Connector (OSTI)

... in each mine and then taken to the Radiological Protection Service laboratory for content of radon to be measured. The sample was transferred to a vessel containing a zinc sulphide ... vessel containing a zinc sulphide screen held at a negative potential. The decay of the radon atoms produces positively charged radium-A atoms which are attracted to the screen, and ...

M. J. DUGGAN; D. M. HOWELL; P. J. SOILLEUX

1968-09-14T23:59:59.000Z

173

Radon-222, CO, CH4 and Continental Dust over the Greenland and Norwegian Seas  

Science Journals Connector (OSTI)

... The experiment was undertaken to investigate the relationships between these parameters and air mass trajectories. Radon (222Rn)-a radioactive rare gas emanating essentially from large continental land areas-and dust ... removed by coagulation and fallout or washed out by rain or fog, although comparison of radon level and dust data may be helpful in tracing the trajectory and mixing of air ...

R. E. LARSON; R. A. LAMONTAGNE; P. E. WILKNISS; W. I. WITTMANN

1972-12-08T23:59:59.000Z

174

Radon emanation and electric potential variations associated with transient deformation near reservoir lakes  

Science Journals Connector (OSTI)

... Two of the most often cited earthquake precursors are radon emanation and electric potential variations, but these few reported examples have generally been deemed ... few reported examples have generally been deemed questionable. If a mechanism relating crustal deformation to radon emanation or electrical signals does indeed exist, it is thought to involve fluids. Some ...

M. Trique; P. Richon; F. Perrier; J. P. Avouac; J. C. Sabroux

1999-05-13T23:59:59.000Z

175

New radon cancer hazard study no cause for alarm in Britain  

Science Journals Connector (OSTI)

... subject of a major health study to determine how cancers caused by the emission of radon gas from their foundations can be prevented. ... gas from their foundations can be prevented.Radon-222, a naturally occurring radioactive gas emitted from igneous rock with uranium content such ...

Bill Johnstone

1987-02-05T23:59:59.000Z

176

Fault location by radon and mercury detection at an active volcano in Nicaragua  

Science Journals Connector (OSTI)

... Radon was detected using a sensitive film enclosed in Track Etch Detector Cups which were buried ... -30 days. Analyses of the tracks on the film were performed by the manufacturer. Radon is reported as tracks per mm2 per 30 days (0.91 tracks per mm2 ...

William B. Crenshaw; Stanley N. Williams; Richard E. Stoiber

1982-11-25T23:59:59.000Z

177

? decay of the very neutron-deficient isotopes 197–199Fr  

Science Journals Connector (OSTI)

Decay properties of the very neutron-deficient isotopes 197–199Fr were studied at the velocity filter Separator for Heavy Ion reaction Products (SHIP) at GSI in Darmstadt. The isotopes were produced in the 2n–4n evaporation channels of the fusion-evaporation reaction 60Ni+141Pr ? 201Fr*. Improved ?-decay properties of 199Fr were determined and the possible existence of two ?-decaying states in this nucleus is discussed. For the isotope 198Fr a broad ?-decay energy distribution was detected in the range of (7470–7930) keV and two ?-decaying states were observed with half-lives of 1.1(7) and 15(3) ms. The new isotope 197Fr was identified based on the observation of one ?-decay chain yielding E?=7728(15) keV and T1/2=0.6?0.3+3.0 ms. The systematics of reduced ?-decay widths are presented for neutron-deficient francium, radon, and astatine isotopes.

Z. Kalaninová; A. N. Andreyev; S. Antalic; F. P. Heßberger; D. Ackermann; B. Andel; M. C. Drummond; S. Hofmann; M. Huyse; B. Kindler; J. F. W. Lane; V. Liberati; B. Lommel; R. D. Page; E. Rapisarda; K. Sandhu; Š. Šáro; A. Thornthwaite; P. Van Duppen

2013-04-29T23:59:59.000Z

178

Construction and measurements of a vacuum-swing-adsorption radon-mitigation system  

E-Print Network [OSTI]

Long-lived alpha and beta emitters in the $^{222}$Rn decay chain on (and near) detector surfaces may be the limiting background in many experiments attempting to detect dark matter or neutrinoless double-beta decay, and in screening detectors. In order to reduce backgrounds from radon-daughter plate-out onto the wires of the BetaCage during its assembly, an ultra-low-radon cleanroom is being commissioned at Syracuse University using a vacuum-swing-adsorption radon-mitigation system. The radon filter shows ~20$\\times$ reduction at its output, from 7.47$\\pm$0.56 to 0.37$\\pm$0.12 Bq/m$^3$, and the cleanroom radon activity meets project requirements, with a lowest achieved value consistent with that of the filter, and levels consistently < 2 Bq/m$^3$.

R. W. Schnee; R. Bunker; G. Ghulam; D. Jardin; M. Kos; A. S. Tenney

2014-04-23T23:59:59.000Z

179

Study on radon and radium concentrations in drinking water in west region of Iran  

E-Print Network [OSTI]

One of the most important characterizations of social health is existence the availability of safe drinking water. Since one of the sources of water contamination is nuclear contamination from radon gas, so in this research radon 222 concentration levels in water supplies in the Toyserkan (a region located in the west of Iran) is investigated. For measuring radon gas in water wells and springs Lucas chamber method is used. Review the results of these measurements that taken from 15th place show that, only five sites have radon concentrations above the limit dose. To reduce radon concentration, it is better to keep water in open pools in contact with air before the water is delivered to users.

Forozani, Ghasem

2011-01-01T23:59:59.000Z

180

lead-isotope age  

Science Journals Connector (OSTI)

lead-isotope age, lead-lead age [An age in years calculated from the ratio of lead-207 to lead-206, a by-product of the uranium-thorium-lead age method] ? Blei-Isotopen-Alter n

2014-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

ISOTOPES IN WATER  

Science Journals Connector (OSTI)

The study of isotopic prosies ha two different though related basic aims: an understanding of the way in which the water cycle in linked to alterations in climate, and how the carbon cycle has responded to the...

W. GEORGE DARLING; ADRIAN H. BATH…

2006-01-01T23:59:59.000Z

182

Nuclear isotope thermometry  

Science Journals Connector (OSTI)

We discuss different aspects which might influence temperatures deduced from experimental isotopic yields in the multifragmentation process. It is shown that fluctuations due to the finite size of the system and distortions due to the decay of hot primary fragments conspire to blur the temperature determination in multifragmentation reactions. These facts suggest that caloric curves obtained through isotope thermometers, which were taken as evidence for a first-order phase transition in nuclear matter, should be investigated very carefully.

S. R. Souza, W. P. Tan, R. Donangelo, C. K. Gelbke, W. G. Lynch, and M. B. Tsang

2000-11-10T23:59:59.000Z

183

Atomic Spectroscopy and Separated Isotopes  

Science Journals Connector (OSTI)

The advantages in the use of separated isotopes in atomic spectroscopy for the determination of nuclear momentsI ? Q and for studies of the isotope-shift phenomena are discussed. Illustrations of spectra are given for mercury uranium and samarium. In addition a summary is given of twenty-two so-called problem nuclei i.e. those naturally occurring isotopes for which the nuclear moments are completely uncertain. Concluding remarks are made on such problems as the evaluation of the absolute magnitude of isotope shifts the role of “forbidden transitions” in isotope spectra and the potential future value of spectro-isotopic assay techniques.

J. R. McNally Jr.

1952-01-01T23:59:59.000Z

184

Radioactive Kr Isotopes  

Science Journals Connector (OSTI)

A radioactive isotope of 1.1-hour half-life has been produced in krypton by alpha-particle bombardment of Se74, enriched electromagnetically from 0.9 percent to 14.1 percent. Assignment of the isotope is made to Kr77. Aluminum absorption measurements indicate a positron end point of 1.7 Mev. In addition to annihilation radiation, gamma-rays and K-capture have been observed. The ratio of K-capture to positron emission from the Se74(?,n) reaction is computed as 2.6. The krypton 1.42-day isotope has been produced by an ?,n reaction on electromagnetically enriched Se76. The isotope is located as Kr79 and its half-life confirmed. A positron end point of 1.0 Mev is determined by aluminum absorption measurements. In addition to annihilation radiation, gamma-rays and K-capture have been observed. The ratio of K-capture to positron emission from the Se76(?,n) reaction is computed to be 50. The cross-section ratio for formation of Kr77 compared to Kr79 by alpha-particle bombardment of selenium is computed as 1.4. The 4.6-hour Kr85 isotope has been produced by a Se(?,n) reaction.

L. L. Woodward; D. A. Mccown; M. L. Pool

1948-10-01T23:59:59.000Z

185

Isotope separation apparatus  

DOE Patents [OSTI]

Isotope separation apparatus consisting of a plurality of cells disposed adjacent to each other in an evacuated container. A common magnetic field is established extending through all of the cells. A source of energetic electrons at one end of the container generates electrons which pass through the cells along the magnetic field lines. Each cell includes an array of collector plates arranged in parallel or in tandem within a common magnetic field. Sets of collector plates are disposed adjacent to each other in each cell. Means are provided for differentially energizing ions of a desired isotope by applying energy at the cyclotron resonant frequency of the desired isotope. As a result, the energized desired ions are preferentially collected by the collector plates.

Arnush, Donald (Rancho Palos Verdes, CA); MacKenzie, Kenneth R. (Pacific Palisades, CA); Wuerker, Ralph F. (Palos Verdes Estates, CA)

1980-01-01T23:59:59.000Z

186

GENERATION OF RADIOXENON ISOTOPES  

SciTech Connect (OSTI)

With the continued population of the International Monitoring System (IMS) network and the certification of radioxenon laboratory systems it has become necessary to calibrate and test these systems using as many of the radioxenon isotopes as possible. Several very promising techniques have been explored recently that allow for convenient production of Xe-133, Xe-131m, the short-lived isotope Xe-135, and even the difficult to obtain Xe-133m. IMS national and international laboratories have traditionally obtained Xe-133 from medical isotope suppliers. The activity of these medical dose samples is extremely high (~ 740 MBq) and requires very careful fume hood work to dilute down to appropriate levels (~ 10 Bq). By waiting for 10 or more half-lives it is possible to reduce the handling regimen considerably, while also obtaining a strong Xe-131m signature due to its longer half-life (11.9 days). The short-lived isotope Xe-135 (9.14 hrs) and the longer lived parent nuclide Xe-133m (2.2 day half-life) are never present in these samples. To obtain these isotopes another source or technique is required. This paper will discuss the two techniques developed and implemented at Pacific Northwest National Lab (PNNL) and show the results obtained from each technique. The first is an in-house method that allows for on demand production of two of these isotopes, Xe-133 and Xe-135, using HEU and a modest flux neutron source. The second method uses a research reactor at the Pullman campus of Washington State University to produce Xe-133, Xe-133m and Xe-135.

McIntyre, Justin I.; Pratt, Sharon L.; Bowyer, Ted W.; Cooper, Matthew W.; Hayes, James C.; Heimbigner, Tom R.; Hubbard, Charles W.; Miley, Harry S.; Ripplinger, Mike D.

2008-09-23T23:59:59.000Z

187

Isotope Effect of Mercury Diffusion in Air  

Science Journals Connector (OSTI)

Isotope fractionation describes the separation of a reservoir with one isotope composition into “fractions” with different isotope compositions due to small isotopic differences in equilibrium partitioning, rates of mass transfer, or rates of transformation. ... (29) ?202Hg is the value most frequently used to examine mass dependent fractionation of mercury isotopes as 202Hg is the heaviest mercury isotope without significant isobaric interferences. ...

Paul G. Koster van Groos; Bradley K. Esser; Ross W. Williams; James R. Hunt

2013-12-23T23:59:59.000Z

188

Ground radon survey of a geothermal area in Hawaii | Open Energy  

Open Energy Info (EERE)

radon survey of a geothermal area in Hawaii radon survey of a geothermal area in Hawaii Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Ground radon survey of a geothermal area in Hawaii Abstract Rates of ground radon emanation, inthe Puna geothermal area on the lower east riftof Kilauea volcano, were measured by alpha particle sensitive cellulose nitrate films. The survey successfully defined an area of thermal significance associated with the rift structure,and suggests that a thermally driven ground gas convection system exists within, and peripheralto, the rift. This type of survey was found suitable for the basaltic island environment characteristic of Hawaii and is now used in Hawaii as a routine geothermal exploration technique. Author Malcolm E. Cox Published Journal

189

Radon Concentration in Groundwater in the Central Region of Gyeongju, Korea - 13130  

SciTech Connect (OSTI)

Radon is a naturally occurring radioactive gas that is a well known cause of lung cancer through inhalation. Nevertheless, stomach cancer can also occur if radon-containing water is ingested. This study measured the radon concentration in groundwater for drinking or other domestic uses in the central region of Gyeongju, Korea. The groundwater samples were taken from 11 points chosen from the 11 administrative districts in the central region of Gyeongju by selecting a point per district considering the demographic distribution including the number of tourists who visit the ancient ruins and archaeological sites. The mean radon concentrations in the groundwater samples ranged from 14.38 to 9050.73 Bq.m{sup -3}, which were below the recommendations by the U.S. EPA and WHO. (authors)

Lee, Jung Min; Lee, A. Rim; Park, Chan Hee; Moon, Joo Hyun [Dongguk University, Seokjangdong, Gyeongju, Gyeongbuk, 780-714 (Korea, Republic of)] [Dongguk University, Seokjangdong, Gyeongju, Gyeongbuk, 780-714 (Korea, Republic of)

2013-07-01T23:59:59.000Z

190

Radon entry rate analyses using in situ tracer gas method application  

Science Journals Connector (OSTI)

......underestimate the complexity of energy retrofitting itself. In...Hazards Associated With Home Energy Retrofits. (2012) The National Renewable Energy Laboratory, U.S. Department...for the purpose of radon mitigation effectiveness proper evaluation......

A. Fro?ka; K. Jílek

2014-07-01T23:59:59.000Z

191

Preventing radon in new homes well worth it in the UK  

Science Journals Connector (OSTI)

Implementing basic preventive measures against radon in new homes is likely to be a “highly cost effective public health intervention”, with the potential to make a “modest but worthwhile” contribution to reducin...

2009-02-01T23:59:59.000Z

192

Indoor radon concentration measurements in some dwellings of the Penisola Sorrentina, South Italy  

Science Journals Connector (OSTI)

......multiple groups were performed by non-parametric Kruskal-Wallis test. All statistical analyses were performed using...values are represented by dots. The application of Kruskal-Wallis test demonstrated that the annual radon concentrations......

Maria Quarto; Mariagabriella Pugliese; Filomena Loffredo; Vincenzo Roca

2013-09-01T23:59:59.000Z

193

Radon levels and doses in dwellings in two villages in Kosovo, affected by depleted uranium  

Science Journals Connector (OSTI)

......villages in Kosovo, affected by depleted uranium G. Nafezi 1 A. Gregoric 2...included in the study was hit by depleted uranium projectiles during the North...1999. Although no impact of depleted uranium on radon levels has been observed......

G. Nafezi; A. Gregoric; J. Vaupotic; M. Bahtijari; M. Kuqali

2014-02-01T23:59:59.000Z

194

RADIATIOh RESEARCH 142,61-69 (1995) The Biological Effectiveness of Radon-ProgenyAlpha Particles.  

E-Print Network [OSTI]

for uranium miners or on data derived from A-bomb sur- vivors; comparison of domestic radon risk estimates studied. (d)The conversion from effective dose per unit exposure in a mine to effective dose per unit

Brenner, David Jonathan

195

Development and application of the scintillation flask technique for the measurement of indoor radon-222 concentrations  

E-Print Network [OSTI]

continuous occupancy to conservatively calculate the number of WLM/year a person might receive. 29 TABLE 6 Radon Exposures (WLM/yr) in Selective Buildings on the Texas A 6 M University Campus. Minimum" ~MLM/ r Maximum* ~MLM/ Average* ~MLM... continuous occupancy to conservatively calculate the number of WLM/year a person might receive. 29 TABLE 6 Radon Exposures (WLM/yr) in Selective Buildings on the Texas A 6 M University Campus. Minimum" ~MLM/ r Maximum* ~MLM/ Average* ~MLM...

Vasquez, Gerard Michael

2012-06-07T23:59:59.000Z

196

The influence of fractal size distribution of covers on radon exhalation from uranium mill tailings  

Science Journals Connector (OSTI)

Tailings produced during mining and milling of uranium ores represent potentially large volumes of low level radioactive materials. A typical environmental problem associated with mill tailings is radon emanation. Covering tailings is widely applied to reduce radon exhalation rate. In this paper, the fractal theories and field covering tests are used to study the fractal characters of size distribution of six types of covering materials, including waste rock, sand, laterite, kaolin, mixture of sand and laterite, and mixture of waste rock and laterite, and their influences on radon exhalation. The size distributions of uranium tailings and the six aforementioned covering materials all exhibit a good fractal structure. The contents of fine grain increase with the increasing value of fractal dimension. The results of field radon measurement show that the radon emanation rate of tailings without covers is 14.7–18.6 Bq/m2 s. Covering tests were carried out of the six abovementioned covering materials with thickness of 0.4 m, 0.8 m, 1.2 m, 1.6 m and 2.0 m. The results indicate that the application of these materials for cover layers can decrease the radon exhalation rate markedly. The effectiveness of a cover layer in reducing radon exhalation is related to its fractal texture of size distribution. Under the same thickness conditions, the attenuation coefficient of radon exhalation rate increases with the increasing fractal dimension of size distribution of covers. The empirical expressions of the attenuation coefficients in relation to fractal dimension D of size distribution and thickness x of covers is obtained for evaluating the effectiveness of final covers for uranium tailings impoundments.

Kaixuan Tan; Zehua Liu; Liangshu Xia; Junwen Lv; Hanqiao Hu

2012-01-01T23:59:59.000Z

197

Estimation of heat and chemical fluxes from a seafloor hydrothermal vent field using radon measurements  

Science Journals Connector (OSTI)

... exists at about 200 m above the depth of the vent field12'13. Distinct excess radon levels have been observed at Endeavour both in vent water and in the effluent plume ... vent water and in the effluent plume up to 17 km from the ridge axis14.Radon is a chemically inert gas with a radioactive half life of 3.85 days. ...

N. D. Rosenberg; J. E. Lupton; D. Kadko; R. Collier; M. D. Lilley; H. Pak

1988-08-18T23:59:59.000Z

198

Development of a method for determination of radon emanation from small soil samples  

E-Print Network [OSTI]

DEVELOPMENT OF A METHOD FOR DETERMINATION OF RADON EMANATION FROM S~ SOIL SAMPLES A Thesis by MICHAEL VINCENT MADONIA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1990 Major Subject: Health Physics DEVELOPMENT OF A METHOD FOR DETERMINATION OF RADON EMANATION FROM SMALL SOIL SAMPLES A Thesis by MICHAEL VINCENT MADONIA Approved as to style and content by: Milton E. Mc...

Madonia, Michael Vincent

2012-06-07T23:59:59.000Z

199

Influence of radon diffusion on the /sup 210/Pb distribution in sediments  

SciTech Connect (OSTI)

A mathematical model is presented which describes the distribution of radon 222 in sediments having a constant or variable depth distribution of radium 226. The model is extended to the distribution of lead 210, taking into account the mobility of radon (the precursor of /sup 210/Pb) within the sediment column. The /sup 210/Pb model is compared, at constant radium activity, with the conventional approach which disregards the radon diffusion when estimating sedimentation rates by the /sup 210/Pb method. The ratio between apparent and real sedimentation rate, s'/s, expressed as a function of three dimensionless parameters, demonstrates the importance of the radon diffusion effect. This effect is particularly important for sediments with small initial excess /sup 210/Pb activity, small sedimentation rate, large radon diffusivity, or a combination of these factors. Applied to Lake Geneva, the sedimentation is estimated to be larger by 30--50% than the original value by Krishnaswami et al, (1971). In sediments which are mixed at the surface (physical mixing or bioturbation), the /sup 210/PB activity in the mixed layer is diminished compared to that in the settling sediment material (Robbins et al., 1977), and radon diffusion makes the activity difference even larger, especially for low initial excess /sup 210/Pb activity, small sedimentation rate, and large mixing intensity. This result may be of importance for the balance of /sup 210/Pb in an aquatic system if the calculations are based on activities measured in the sediment.

Imboden, D.M.; Stiller, M.

1982-01-20T23:59:59.000Z

200

Development of radon sources with a high stability and a wide range  

SciTech Connect (OSTI)

A solid {sup 222}Rn (radon) source using a fibrous and porous SiC ceramic disk was developed. The emission rate of radon emanated from the disk depended on the content of {sup 226}Ra and the sintering temperature. A {sup 226}Ra sulfate ({sup 226}RaSO{sub 4}) solution was dropped on a fibrous SiC ceramic disk (33 mm?) of 1 mm in thickness, and sintered at 400 °C. The radon concentration from a disk containing {sup 226}Ra of 1.85 MBq was measured to be 38 kBq m{sup ?3} at a carrier airflow rate of 0.5 L min{sup ?1}. By adjusting the {sup 226}Ra content or the sweep airflow rate, the radon concentrations were easily controlled over a wide range of over three orders of magnitude. The concentration was very stable for a long term. The compactness of the source disk made is easy for handling the source container and the shielding of gamma radiation from {sup 226}Ra and its decay products. Such advantages in a radon generation system are desirable for experiments of high-level, large-scale radon exposure.

Fukutsu, K.; Yamada, Y. [National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555 (Japan)] [National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555 (Japan)

2013-12-15T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

UN PROCD DE DOSAGE CONTINU DU RADON DANS L'AIR ATMOSPHRIQUE. APPLICATION A LA PROSPECTION DE L'URANIUM  

E-Print Network [OSTI]

: it permits measurement of the activity of radioactive products of radon in air ; the air permits pass through176 UN PROC�D� DE DOSAGE CONTINU DU RADON DANS L'AIR ATMOSPH�RIQUE. APPLICATION A LA PROSPECTION DE radon de l'air atmo- sphérique. Une pompe à grand débit aspire l'air à analyser à travers un papier

Boyer, Edmond

202

Comparisons between stable isotope tr  

Science Journals Connector (OSTI)

Nitrogen spiraling in streams: Comparisons between stable isotope tracer and nutrient addition experiments. Abstract—A common method to quantify stream.

2007-05-31T23:59:59.000Z

203

Nuclear Instruments and Methods in Physics Research A 564 (2006) 319323 Passive monitoring of the equilibrium factor inside a radon exposure  

E-Print Network [OSTI]

-lived radon progeny contributes about half of the total exposure of human beings to ionizing radiation of the determined ranges of F for a few LR 115 SSNTDs can give a very good estimate of the true equilibrium factor. It is also well known that the radon dose delivered to the lungs is not attributed to the radon gas itself

Yu, K.N.

204

RADIOCHEMICAL STUDIES OF NEUTRON DEFICIENT ACTINIDE ISOTOPES  

E-Print Network [OSTI]

Isotope Targets and Foils, AERE-R 5097, Paper 10 (1965). V.Isotope Targets and Foils, AERE-R 5097 Paper 12 (1965). K.M.Isotope Targets and Foils, AERE-R-5097 Paper 11 (1965). M.

Williams, Kimberly Eve

2011-01-01T23:59:59.000Z

205

Advanced isotope separation  

SciTech Connect (OSTI)

The Study Group briefly reviewed the technical status of the three Advanced Isotope Separation (AIS) processes. It also reviewed the evaluation work that has been carried out by DOE's Process Evaluation Board (PEB) and the Union Carbide Corporation-Nuclear Division (UCCND). The Study Group briefly reviewed a recent draft assessment made for DOE staff of the nonproliferation implications of the AIS technologies. The staff also very briefly summarized the status of GCEP and Advanced Centrifuge development. The Study Group concluded that: (1) there has not been sufficient progress to provide a firm scientific, technical or economic basis on which to select one of the three competing AIS processes for full-scale engineering development at this time; and (2) however, should budgetary restraints or other factors force such a selection, we believe that the evaluation process that is being carried out by the PEB provides the best basis available for making a decision. The Study Group recommended that: (1) any decisions on AIS processes should include a comparison with gas centrifuge processes, and should not be made independently from the plutonium isotope program; (2) in evaluating the various enrichment processes, all applicable costs (including R and D and sales overhead) and an appropriate discounting approach should be included in order to make comparisons on a private industry basis; (3) if the three AIS programs continue with limited resources, the work should be reoriented to focus only on the most pressing technical problems; and (4) if a decision is made to develop the Atomic Vapor Laser Isotope Separation process, the solid collector option should be pursued in parallel to alleviate the potential program impact of liquid collector thermal control problems.

Not Available

1982-05-04T23:59:59.000Z

206

Predicting New Hampshire Indoor Radon Concentrations from geologic information and other covariates  

SciTech Connect (OSTI)

Generalized geologic province information and data on house construction were used to predict indoor radon concentrations in New Hampshire (NH). A mixed-effects regression model was used to predict the geometric mean (GM) short-term radon concentrations in 259 NH towns. Bayesian methods were used to avoid over-fitting and to minimize the effects of small sample variation within towns. Data from a random survey of short-term radon measurements, individual residence building characteristics, along with geologic unit information, and average surface radium concentration by town, were variables used in the model. Predicted town GM short-term indoor radon concentrations for detached houses with usable basements range from 34 Bq/m{sup 3} (1 pCi/l) to 558 Bq/m{sup 3} (15 pCi/l), with uncertainties of about 30%. A geologic province consisting of glacial deposits and marine sediments, was associated with significantly elevated radon levels, after adjustment for radium concentration, and building type. Validation and interpretation of results are discussed.

Apte, M.G.; Price, P.N.; Nero, A.V.; Revzan, K.L.

1998-05-01T23:59:59.000Z

207

An indoor radon survey of the X-ray rooms of Mexico City hospitals  

SciTech Connect (OSTI)

This paper presents the results of measurements of indoor radon concentrations in the X-ray rooms of a selection of hospitals in the metropolitan area of Mexico City. The metropolitan area of Mexico City is Mexico's largest metropolitan area by population; the number of patients requiring the use of X-rays is also the highest. An understanding of indoor radon concentrations in X-ray rooms is necessary for the estimation of the radiological risk to which patients, radiologists and medical technicians are exposed. The indoor radon concentrations were monitored for a period of six months using nuclear track detectors (NTD) consisting of a closed-end cup system with CR-39 (Lantrack Registered-Sign ) polycarbonate as detector material. The indoor radon concentrations were found to be between 75 and 170 Bq m{sup -3}, below the USEPA-recommended indoor radon action level for working places of 400 Bq m{sup -3}. It is hoped that the results of this study will contribute to the establishment of recommended action levels by the Mexican regulatory authorities responsible for nuclear safety.

Juarez, Faustino [Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario No. 100. Estado de Mexico, 50000, Mexico. Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Circuito (Mexico); Reyes, Pedro G. [Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario No. 100. Estado de Mexico, 50000 (Mexico); Espinosa, Guillermo [Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Circuito Exterior Ciudad Universitaria, Mexico D.F. Cp.04510 (Mexico)

2013-07-03T23:59:59.000Z

208

Problems Found Using a Radon Stripping Algorithm for Retrospective Assessment of Air Filter Samples  

SciTech Connect (OSTI)

An evaluation of a large number of air sample filters was undertaken using a commercial alpha and beta spectroscopy system employing a passive implanted planar silicon (PIPS) detector. Samples were only measured after air flow through the filters had ceased. Use of a commercial radon stripping algorithm was implemented to discriminate anthropogenic alpha activity on the filters from the radon progeny. When uncontaminated air filters were evaluated, the results showed that there was a time-dependent bias in both average estimates and measurement dispersion of anthropogenic activity estimates with the relative bias being small compared to the dispersion, indicating that the system would not give false positive indications for an appropriately set decision level. By also measuring environmental air sample filters simultaneously with electroplated alpha filters, use of the radon stripping algorithm demonstrated a number of substantial unexpected deviations from calibrated values indicating that the system would give false negative indications. Use of the current algorithm is, therefore, not recommended for general assay applications. Use of the PIPS detector should only be utilized for gross counting without appropriate modifications to the curve-fitting algorithm. As a screening method, the radon stripping algorithm might be expected to see elevated alpha activities on air sample filters (not due to radon progeny) around the 200 disintegrations per minute level.

Robert Hayes

2008-04-01T23:59:59.000Z

209

Use of a Radon Stripping Algorithm for Retrospective Assessment of Air Filter Samples  

SciTech Connect (OSTI)

An evaluation of a large number of air sample filters was undertaken using a commercial alpha and beta spectroscopy system employing a passive implanted planar silicon (PIPS) detector. Samples were only measured after air flow through the filters had ceased. Use of a commercial radon stripping algorithm was implemented to discriminate anthropogenic alpha and beta activity on the filters from the radon progeny. When uncontaminated air filters were evaluated, the results showed that there was a time-dependent bias in both average estimates and measurement dispersion with the relative bias being small compared to the dispersion. By also measuring environmental air sample filters simultaneously with electroplated alpha and beta sources, use of the radon stripping algorithm demonstrated a number of substantial unexpected deviations. Use of the current algorithm is therefore not recommended for assay applications and so use of the PIPS detector should only be utilized for gross counting without appropriate modifications to the curve fitting algorithm. As a screening method, the radon stripping algorithm might be expected to see elevated alpha and beta activities on air sample filters (not due to radon progeny) around the 200 dpm level.

Robert Hayes

2009-01-23T23:59:59.000Z

210

Radon in Soil Gas Above Bedrock Fracture Sets at the Shepley’s Hill Superfund Site  

SciTech Connect (OSTI)

The Idaho National Laboratory (INL) recently provided technical support for ongoing environmental remediation activities at the Shepley’s Hill remediation site near Devens, MA (Figure 1). The technical support was requested as follow-on work to an initial screening level radiation survey conducted in 2008. The purpose of the original study was to assess the efficacy of the INL-developed Backpack Sodium Iodide System (BaSIS) for detecting elevated areas of natural radioactivity due to the decay of radon-222 gases emanating from the underlying fracture sets. Although the results from the initial study were mixed, the BaSIS radiation surveys did confirm that exposed bedrock outcrops have higher natural radioactivity than the surficial soils, thus a high potential for detecting elevated levels of radon and/or radon daughter products. (INL 2009) The short count times associated with the BaSIS measurements limited the ability of the system to respond to elevated levels of radioactivity from a subsurface source, in this instance radon gas emanating from fracture sets. Thus, it was postulated that a different methodology be employed to directly detect the radon in the soil gases. The CR-39 particle track detectors were investigated through an extensive literature and technology search. The relatively long deployment or “detection” time of several days, as well as the sensitivity of the measurement and robustness of the detectors made the CR-39 technology promising for deployment at the Shepley’s Hill site.

J.R. Giles; T.L. McLing; M.V. Carpenter; C.J. Smith; W. Brandon

2012-12-01T23:59:59.000Z

211

In-vivo measurements of Pb-210 to determine cumulative exposure to radon daughters: A pilot study  

SciTech Connect (OSTI)

The objective of this study is to demonstrate the feasibility of estimating cumulative exposure of individuals to low concentrations of radon by measuring the amount of Pb-A-10 in their skeletons. This report presents progress to date establishing the validity of an vivo technique to measure skeletal burdens of Pb-210, accumulated from exposure to radon and radon progeny. With the skeletal content of Pb--210 and a model for Pb metabolism, cumulative exposure to radon and its short-lived daughters (radon/daughters) may be calculated for use in deriving a dose-response relationship between lung cancer and exposure to radon/daughters. Data are presented for 29 subjects exposed to above-average'' radon concentrations in their homes, showing the correlation between measured Pb--210 burdens, and measured pCi/l and WLM exposure estimates. Their results are compared to measurements of a population of 24 subject's presumed exposed to average concentrations. Measurements of a Pennsylvania family exposed for a year in a home with an extremely high radon content are also presented. Update of results of an ongoing study of the biological half-time of Pb--210 in man involving measurements, of a retired radiation worker with a 40 year old skeletal burden of Pb-210.

Laurer, G.R.; Cohen, N. (New York Univ. Medical Center, Tuxedo, NY (United States). Dept. of Environmental Medicine); Stark, A.; Ju, C. (New York State Dept. of Health, Albany, NY (United States). Bureau of Environmental and Occupational Epidemiology)

1991-05-01T23:59:59.000Z

212

Removal of Xenon and Radon from Contaminated Atmospheres with Dioxygenyl Hexafluoroantimonate, O2SbF6  

Science Journals Connector (OSTI)

... process gas, and the excess fluorine must be removed afterwards. I have shown that radon, the heaviest noble gas, can be collected by oxidation with liquid bromine trifluoride and ... ). I report here further experiments with a dioxygenyl salt, O2SbF6, which reacts with radon and xenon at 25 C and which appears very promising as a reagent for removing ...

L. STEIN

1973-05-04T23:59:59.000Z

213

Isotopic Analysis- Fluid | Open Energy Information  

Open Energy Info (EERE)

Isotopic Analysis- Fluid Isotopic Analysis- Fluid Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Isotopic Analysis- Fluid Details Activities (61) Areas (32) Regions (6) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Fluid Lab Analysis Parent Exploration Technique: Fluid Lab Analysis Information Provided by Technique Lithology: Water rock interaction Stratigraphic/Structural: Hydrological: Origin of hydrothermal fluids; Mixing of hydrothermal fluids Thermal: Isotopic ratios can be used to characterize and locate subsurface thermal anomalies. Dictionary.png Isotopic Analysis- Fluid: Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in

214

Isotope Development & Production | Nuclear Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of the "Calutrons" (electromagnetic enrichment devices) were converted by ORNL to the separation and enrichment of stable isotopes and some actinide isotopes. Until 1998 when...

215

Radon-222 progeny surface deposition and resuspension - residential materials  

SciTech Connect (OSTI)

In evaluating the hazards from indoor {sup 222}Rn, it is imperative that the behavior of the four short-lived particulate progeny are fully understood since they are the radioisotopes that deliver most of the radiobiological damage to occupants. One known characteristic of these radon progeny is that they deposit (plate out) onto macroscopic surfaces. Some of these plated-out atoms become resuspended when they disintegrate and decay to the next progeny, in particular, {sup 218}Po. Both of these mechanisms, plateout and resuspension, affect the airborne population of the individual daughters and their impact on the radiation energy delivered to the human respiratory system. There are two specific and separate areas of concern, One is that monitoring {sup 222} Rn levels alone, such as with charcoal canisters, is obviously not sufficient to determine the radiation dose since the daughters are never in absolute equilibrium with {sup 222}Rn. Further, from an internal dose standpoint, the {open_quotes}unattached{close_quotes} fraction (free ions) of the daughters are believed, by virtue of their deeper tissue depositions in the tracheo-bronchial tract, to deliver the greatest dose in the body. Currently, there are virtually no data on the measurements of both plateout rates and resuspension factors for specific individual residential material surfaces. This report presents experimental data of plateout rates in an indoor house for typical indoor materials. Results of measurements of resuspension factors for some of the materials are provided.

Leonard, B.E.

1994-12-31T23:59:59.000Z

216

Training Activities on Radioactive Waste Management at Moscow SIA -Radon-: Experience, Practice, Theory  

SciTech Connect (OSTI)

Management of radioactive waste relates to the category of hazardous activities. Hence the requirements to the professional level of managers and personnel working in this industry are very high. Education, training and examination of managers, operators and workers are important elements of assuring safe and efficient operation of radioactive waste management sites. The International Education Training Centre (IETC) at Moscow State Unitary Enterprise Scientific and Industrial Association 'Radon' (SIA 'Radon'), in co-operation with the International Atomic Energy Agency (IAEA), has developed expertise and provided training to waste management personnel for the last 10 years. The paper summarizes the current experience of the SIA 'Radon' in the organisation and implementation of the IAEA sponsored training and others events and outlines some of strategic educational elements, which IETC will continue to pursue in the coming years. (authors)

Batyukhnova, O.G.; Arustamov, A.E.; Dmitriev, S.A.; Agrinenko, V.V. [SUE SIA -Radon-, The 7-th Rostovsky Lane 2/14, Moscow (Russian Federation); Ojovan, M.I. [Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building (United Kingdom); Drace, Z. [International Atomic Energy Agency, Vienna (Austria)

2008-07-01T23:59:59.000Z

217

ISOTOPE FRACTIONATION Isotopes are atoms whose nuclei contain the same number of protons but a different number of neutrons. The  

E-Print Network [OSTI]

the most abundant isotope appears in the denominator: b R = b E / a E (stable boron isotopes = , [ ] [ ] [ ] [ ]OOCOOC2 OOCOOC2 O 16181616 16181818 CO 18 2 + + = . The isotopic composition, , of a sample, determined____________________________ ISOTOPE FRACTIONATION ____________________________ Isotopes are atoms

Zeebe, Richard E.

218

Radon concentrations in ground and drinking water in the state of Chihuahua, Mexico  

Science Journals Connector (OSTI)

This paper reports 222Rn concentrations in ground and drinking water of nine cities of Chihuahua State, Mexico. Fifty percent of the 114 sampled wells exhibited 222Rn concentrations exceeding 11 Bq/L, the maximum contaminant level (MCL) recommended by the USEPA. Furthermore, around 48% (123 samples) of the tap-water samples taken from 255 dwellings showed radon concentrations over the MCL. There is an apparent correlation between total dissolved solids and radon concentration in ground-water. The high levels of 222Rn found may be entirely attributed to the nature of aquifer rocks.

L. Villalba; L. Colmenero Sujo; M.E. Montero Cabrera; A. Cano Jiménez; M. Rentería Villalobos; C.J. Delgado Mendoza; L.A. Jurado Tenorio; I. Dávila Rangel; E.F. Herrera Peraza

2005-01-01T23:59:59.000Z

219

Technical manual, redesigned ARC-2A automatic radon counter. Final report  

SciTech Connect (OSTI)

The ARC-2A Automatic Radon Counter (Serial No. 87003) was manufactured in 1987 by Ocean Communication Systems, Inc, Panama City, Florida. It was designed as a stand-alone system, but was consistently plagued with problems. The manufacturer could not repair the machine. The ARC-2A was completely redesigned at NCCOSC RDT and E Division. It is now interfaced to a computer. A new manual was written with updated information and user instructions. The ARC-2A is an integral part of ongoing electro-optic propagation studies.... Radon, Electro-optics, Aerosol.

Littfin, K.M.

1992-09-01T23:59:59.000Z

220

The improvement of methods used to estimate radon concentration in air using nuclear track film  

E-Print Network [OSTI]

THE IMPROVEMENT OF METHODS USED TO ESTIMATE RADON CONCENTRATION IN AIR USING NUCLEAR TRACK FILM A Thesis by JAMES G. JESSICK Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December t 9BB Major Subject: Health Physics THE IMPROVEMENT OF METHODS USED TO ESTIMATE RADON CONCENTRATION IN AIR USING NUCLEAR TRACK FILM A Thesis by JAMES G. JESSICK Approved as to style and content by: Milton E...

Jessick, James G.

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Apparatus and process for separating hydrogen isotopes  

DOE Patents [OSTI]

The apparatus and process for separating hydrogen isotopes is provided using dual columns, each column having an opposite hydrogen isotopic effect such that when a hydrogen isotope mixture feedstock is cycled between the two respective columns, two different hydrogen isotopes are separated from the feedstock.

Heung, Leung K; Sessions, Henry T; Xiao, Xin

2013-06-25T23:59:59.000Z

222

Isotopic Analysis- Rock | Open Energy Information  

Open Energy Info (EERE)

Isotopic Analysis- Rock Isotopic Analysis- Rock Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Isotopic Analysis- Rock Details Activities (13) Areas (11) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Rock Lab Analysis Parent Exploration Technique: Rock Lab Analysis Information Provided by Technique Lithology: Water rock interaction Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Isotopic Analysis- Rock: Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in a given system, while the conditions which increase/decrease the number of neutrons are well understood and measurable.

223

Novel hybrid isotope separation scheme and apparatus  

DOE Patents [OSTI]

A method is described for yielding selectively a desired enrichment in a specific isotope including the steps of inputting into a spinning chamber a gas from which the specific isotope is to be isolated, radiating the gas with frequencies characteristic of the absorption of a particular isotope of the atomic or molecular gas, thereby inducing a photoionization reaction of the desired isotope, and collecting the specific isotope ion by suitable ion collection means. 3 figures.

Maya, J.

1991-06-18T23:59:59.000Z

224

Novel hybrid isotope separation scheme and apparatus  

DOE Patents [OSTI]

A method of yielding selectively a desired enrichment in a specific isotope including the steps of inputting into a spinning chamber a gas from which the specific isotope is to be isolated, radiating the gas with frequencies characteristic of the absorption of a particular isotope of the atomic or molecular gas, thereby inducing a photoionization reaction of the desired isotope, and collecting the specific isotope ion by suitable ion collection means.

Maya, Jakob (Brookline, MA)

1991-01-01T23:59:59.000Z

225

Concentrations of dissolved radon-222 in water from selected wells and springs in Idaho, 1989-91  

SciTech Connect (OSTI)

Concentrations of dissolved radon-222, a naturally occurring radioactive gas, are found in water in Idaho. The U.S. Geological Survey collected water samples for radon-222 analyses from 338 Idaho wells and springs during 1989-91. These water samples were collected as part of ongoing monitoring programs with the Idaho Department of Water Resources and the U.S. Department of Energy. Concentrations of dissolved radon-222 in 372 of the water samples ranged from -58{+-}30 to 5,715{+-}66 picocuries per liter; the mean and median concentrations were 446{+-}35 and 242{+-}25 picocuries per liter, respectively.

Cecil, L.D.; Parliman, D.J.; Edwards, D.D.; Young, H.W.

1994-11-01T23:59:59.000Z

226

QA programme for radon and its short-lived progeny measuring instruments in NRPI Prague  

Science Journals Connector (OSTI)

......radon using a radium water solution standard with...to 2 bars of absolute atmospheric pressure with a system...store tank up to normal atmospheric pressure, which is...carnauba wax aerosol generator, pump, etc.) and...carnauba wax aerosol generator, production of well-defined......

K. Jílek; J. Thomas; M. Brabec

2008-06-01T23:59:59.000Z

227

Protection from radon exposure at home and at work in the directive 2013/59/Euratom  

Science Journals Connector (OSTI)

......national action plan). The basic...basic safety standards. On the other...are kept under review. This situation...transpose such standards into national...Radon action plan) and in Annex...schedules for reviews of the action plan (10) strategy......

F. Bochicchio

2014-07-01T23:59:59.000Z

228

Radon entry rate analyses using in situ tracer gas method application  

Science Journals Connector (OSTI)

......indoor environment, standard methods of radon diagnosis...ventilation (specific modes of HVAC systems operation...for new houses given in standards. Table-5. Results...efforts to comply with the standard requirements on new buildings...services in buildings like HVAC systems, water and gas......

A. Fro?ka; K. Jílek

2014-07-01T23:59:59.000Z

229

Monitoring trends in civil engineering and their effect on indoor radon  

Science Journals Connector (OSTI)

......with natural floors and clay houses. RADON AND ENERGY-EFFICIENT...In the European Union, the housing sector is currently responsible...building to reach a high level of energy efficiency. Within the EU-project...37 low-energy and passive houses in Austria. Both long-term......

W. Ringer

2014-07-01T23:59:59.000Z

230

A TIME-DEPENDENT METHOD FOR CHARACTERIZING THE DIFFUSION OF RADON-222 IN CONCRETE  

SciTech Connect (OSTI)

The porosity and diffusion length of concrete have been determined by measuring the time-dependent diffusion of radon through a thin slab of the material, One surface of the slab is exposed to a large, fixed radon concentration beginning at t=0. The radon that diffuses out of a portion of the opposite surface is collected during several contiguous time intervals. The total activity collected over a set of intervals beginning at t=0 and the steady-state flux of activity are used to calculate the porosity and diffusion length, As a test of these parameters, they are then used to predict the activity collected during other time intervals and for other sample thicknesses, Samples from two types of concrete were tested: one type yielded a porosity of 0.068 and a diffusion length of 12.6 cm; the respective values for the other were 0.32 and 16.9 cm. The predicted and experimental results agreed well, thereby verifying the assumption that concrete may be treated as a homogenous diffusion medium for radon.

Zapalac, Geordie H.

1981-07-01T23:59:59.000Z

231

Prevention of Lung Cancer by Remediation of Residential Exposure to Radon Daughters  

Science Journals Connector (OSTI)

......Exposure to Radon Daughters J.A. Mahaffey F.T. Cross J.R. Johnson M.C. Baechler The United States Bonneville Power Administration (BPA), as a part of an energy conservation programme in the states of Washington, Oregon, Idaho, Wyoming......

J.A. Mahaffey; F.T. Cross; J.R. Johnson; M.C. Baechler

1991-06-01T23:59:59.000Z

232

Dosimetric and epidemiological approaches to assessing radon doses?can the differences be reconciled?  

Science Journals Connector (OSTI)

......reconcile the two approaches. This is of importance...INTRODUCTION The management of the risk of...based on one of two approaches. The first uses...National Academy of Sciences and National Research...Amsterdam: Elsevier Science) (2003). Dosimetric...epidemiological approaches to assessing radon......

John W. Stather

2004-12-01T23:59:59.000Z

233

Does the Addition of Fly Ash to Concrete Present a Radon Hazard? J. A. Siegel1  

E-Print Network [OSTI]

Street, Suite 450, Austin, Texas, 78701, USA Summary: Fly ash, a waste material from coal-fired power of fly ash [9]. Fly ash is a waste material from coal fired power plants; when added to concrete, fly ashDoes the Addition of Fly Ash to Concrete Present a Radon Hazard? J. A. Siegel1 , M. Juenger1 and J

Siegel, Jeffrey

234

Filter for on-line air monitor unaffected by radon progeny and method of using same  

DOE Patents [OSTI]

An apparatus for testing air having contaminants and radon progeny therein. The apparatus includes a sampling box having an inlet for receiving the air and an outlet for discharging the air. The sampling box includes a filter made of a plate of sintered stainless steel. The filter traps the contaminants, yet allows at least a portion of the radon progeny to pass therethrough. A method of testing air having contaminants and radon progeny therein. The method includes providing a testing apparatus that has a sampling box with an inlet for receiving the air and an outlet for discharging the air, and has a sintered stainless steel filter disposed within said sampling box; drawing air from a source into the sampling box using a vacuum pump; passing the air through the filter; monitoring the contaminants trapped by the filter; and providing an alarm when a selected level of contaminants is reached. The filter traps the contaminants, yet allows at least a portion of the radon progeny to pass therethrough.

Phillips, Terrance D. (Aiken, SC); Edwards, Howard D. (Augusta, GA)

1999-01-01T23:59:59.000Z

235

Radon Series Comp. Appl. Math 8, 129 c de Gruyter 2009 Optimal consumption and investment with  

E-Print Network [OSTI]

Radon Series Comp. Appl. Math 8, 1�29 c de Gruyter 2009 Optimal consumption and investment investment/con- sumption problem for continuous time market models. By applying results from sto- chastic, together with margin tradings on certain financial products, the exposure to losses of investments

Paris-Sud XI, Université de

236

RADON AND RADIUM CONCENTRATION IN WATER FROM NORTH-WEST OF ROMANIA AND THE ESTIMATED DOSES  

Science Journals Connector (OSTI)

......524 Bq l1 with the average of 0.085 Bq l1...population during the consumption of water. Table-2 shows that the average of committed effective...expected doses from the consumption of water in Romania...Assessment for Radon in Homes and Workplaces...International Atomic Energy Agency. International......

M. Moldovan; V. Benea; D. C. Ni??; B. Papp; B. D. Burghele; N. Bican-Bri?an; C. Cosma

2014-07-01T23:59:59.000Z

237

Diurnal and seasonal variability of outdoor radon concentration in the area of the NRPI Prague  

Science Journals Connector (OSTI)

......Against Radon at Home and at Work Diurnal...designed to be low energy consuming and independent...NRPI, where hourly averages of temperature and...Typical current consumption of the entire station...Diurnal and monthly averages of measured atmospheric...are given monthly averages of a v, of the......

K. Jilek; M. Slezákova; J. Thomas

2014-07-01T23:59:59.000Z

238

CORRELATIVE AND MULTIVARIATE ANALYSIS OF INCREASED RADON CONCENTRATION IN UNDERGROUND LABORATORY  

Science Journals Connector (OSTI)

......regression methods for the indoor radon measurements. Nucl. Technol. Radiat. Prot. (2014) 29(1):17-23. 4 Brun R. , Rademakers F. ROOT-an object oriented data analysis framework. Nucl. Inst. Methods Phys. Res. A (1997) 389:81. 5 Hoecker......

Dimitrije M. Maleti?; Vladimir I. Udovi?i?; Radomir M. Banjanac; Dejan R. Jokovi?; Aleksandar L. Dragi?; Nikola B. Veselinovi?; Jelena Filipovi?

2014-07-01T23:59:59.000Z

239

Radon spectroscopy of packet delay Andre Broido, Ryan King, Evi Nemeth, kc claffy  

E-Print Network [OSTI]

techniques, specifically the Radon transform previously applied in geophysics [6] and computer tomography [7 the feasibility of Internet spectroscopy techniques for analysis of rate limiting, packet interarrival delay packet trace data, we find that delay's quantization in micro- and millisecond range is ubiquitous

California at San Diego, University of

240

Effect of radon dose on cleanup criteria and using RESRAD for chemical risk assessment  

SciTech Connect (OSTI)

The US Department of Energy has used RESRAD, a pathway analysis program developed at Argonne National Laboratory, in conjunction with the as low as reasonably achievable (ALARA) principle to develop site-specific residual radioactive material guidelines (cleanup criteria) for many sites. This study examines the effects of the radon pathway, recently added to the RESRAD program, on the calculation of uranium, radium, and thorium cleanup criteria. The results show that the derived uranium guidelines will not be affected by the radon ingrowth considerations. The effect of radon on radium and thorium generic guidelines is more significant, but the model does indicate that at the generic soil limits used for radium and thorium the indoor radon decay product concentrations would be below the 0.02 working level standard. This study also examines the feasibility of applying RESRAD to chemical risk assessment. The results show that RESRAD can perform risk assessment of toxic chemicals after simple modifications. Expansion of the RESRAD database to include chemical compounds will increase its capability to handle chemical risk assessments. 11 refs., 3 tabs.

Yu, C.; Cheng, J.-J. (Argonne National Lab., IL (United States)); Wallo, A. III (USDOE, Washington, DC (United States))

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

395NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.37 NO.4, AUGUST 2005 CONSTRUCTION OF AN ENVIRONMENTAL RADON  

E-Print Network [OSTI]

395NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.37 NO.4, AUGUST 2005 CONSTRUCTION OF AN ENVIRONMENTAL RADON MONITORING SYSTEM USING CR-39 NUCLEAR TRACK DETECTORS GIL HOON AHN* and JAI-KI LEE1 National Nuclear Management & Control Agency 305-600, POX 114 Yuseong, Daejeon, Korea 1 Dept. of Nuclear

242

Automated data extraction from in situ protein stable isotope...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

data extraction from in situ protein stable isotope probing studies. Automated data extraction from in situ protein stable isotope probing studies. Abstract: Protein stable isotope...

243

Copper isotope fractionation in acid mine drainage. | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Copper isotope fractionation in acid mine drainage. Copper isotope fractionation in acid mine drainage. Abstract: We surveyed the Cu isotopic composition of primary minerals and...

244

Isotope production facility produces cancer-fighting actinium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cancer therapy gets a boost from new isotope Isotope production facility produces cancer-fighting actinium A new medical isotope project shows promise for rapidly producing major...

245

Definition: Isotopic Analysis- Fluid | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Isotopic Analysis- Fluid Jump to: navigation, search Dictionary.png Isotopic Analysis- Fluid Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in a given system, while the conditions which increase/decrease the number of neutrons are well understood and measurable. Fluid isotopes are used to characterize a fluids origin, age, and/or interaction with rocks or other fluids based on unique isotopic ratios or concentrations.[1] View on Wikipedia Wikipedia Definition Isotope geochemistry is an aspect of geology based upon study of the relative and absolute concentrations of the elements and their isotopes in

246

Definition: Isotopic Analysis | Open Energy Information  

Open Energy Info (EERE)

Analysis Analysis Jump to: navigation, search Dictionary.png Isotopic Analysis Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in a given system, while the conditions which increase/decrease the number of neutrons are well understood and measurable.[1] View on Wikipedia Wikipedia Definition Isotope analysis is the identification of isotopic signature, the distribution of certain stable isotopes and chemical elements within chemical compounds. This can be applied to a food web to make it possible to draw direct inferences regarding diet, trophic level, and subsistence. Isotope ratios are measured using mass spectrometry, which separates the different isotopes of an element on the basis of their mass-to-charge

247

Calculation of gamma radiation dose rate and radon concentration due to granites used as building materials in Iran  

Science Journals Connector (OSTI)

......G. Magusa, North Cyprus, via Mersin 10, Turkey Natural radioactivity concentrations...equivalent from all natural sources of radiation...health(4). Radon gas is a radionuclide present...to determining the natural radioactivity concentration......

A. Abbasi

2013-07-01T23:59:59.000Z

248

Identification of anomalous radon concentrations due to geodynamic processes by elimination of Rn variations caused by other factors  

Science Journals Connector (OSTI)

......dissolved in underground water (Mishel 1987...fluctuations in atmospheric pressure (Dowell...usually a major generator of radon in underground...convection due to lower atmospheric heating. Towards...the underground water, at Fuchu Observatory......

M. Finkelstein; S. Brenner; L. Eppelbaum; E. Ne'Eman

1998-05-01T23:59:59.000Z

249

Influence of energy-saving measures on the radon concentration in some kindergartens in the Czech Republic  

Science Journals Connector (OSTI)

......improvements to the energy efficiency of the buildings...increasing the energy efficiency of buildings...villa-type house built at the...et al. Home energy efficiency and radon related...Energy and Passive Houses in Austria......

I. Fojtikova; K. Navratilova Rovenska

2014-07-01T23:59:59.000Z

250

Sediment-water chemical exchange in the coastal zone traced by in situ radon-222 flux measurements  

SciTech Connect (OSTI)

In situ radon-222 flux experiments conducted in benthic chambers in Cape Lookout Bight, a small marine basin on the North Carolina coast, reveal that enhanced chemical transport across the sediment-water interface during summer months is caused by abiogenic bubble tube structures. Transport rates for dissolved radon, methane, and ammonium more than three times greater than those predicted on the basis of molecular diffusion occur when open tubes are maintained by semidiurnal low-tide bubbling.

Martens, C.S. (Univ. of North Carolina, Chapel Hill); Kipphut, G.W.; Klump, J.V.

1980-04-18T23:59:59.000Z

251

AVLIS enrichment of medical isotopes  

SciTech Connect (OSTI)

Under the Sponsorship of the United states Enrichment Corporation (USEC), we are currently investigating the large scale separation of several isotopes of medical interest using atomic vapor isotope separation (AVLIS). This work includes analysis and experiments in the enrichment of thallium 203 as a precursor to the production of thallium 201 used in cardiac imaging following heart attacks, on the stripping of strontium 84 from natural strontium as precursor to the production of strontium 89, and on the stripping of lead 210 from lead used in integrated circuits to reduce the number of alpha particle induced logic errors.

Haynam, C.A.; Scheibner, K.F.; Stern, R.C.; Worden, E.F. [Lawrence Livermore National Laboratory, CA (United States)

1996-12-31T23:59:59.000Z

252

Identification of isotopically primitive interplanetary dust particles: A NanoSIMS isotopic imaging study  

E-Print Network [OSTI]

Identification of isotopically primitive interplanetary dust particles: A NanoSIMS isotopic imaging contain larger regions with more modest enrichments in 15 N, leading to average bulk N isotopic of those IDPs that have anomalous bulk N isotopic compositions. These particles typically also contain

253

Spinelolivine magnesium isotope thermometry in the mantle and implications for the Mg isotopic composition of Earth  

E-Print Network [OSTI]

Spinel­olivine magnesium isotope thermometry in the mantle and implications for the Mg isotopic: magnesium isotopes mantle geochemistry meteorites MC-ICPMS The magnesium isotopic composition of Earth., 2004; Poitrasson et al., 2005; Georg et al., 2007; Poitrasson, 2007; Weyer et al., 2007). Magnesium

Manning, Craig

254

Online Catalog of Isotope Products from DOE's National Isotope Development Center  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The National Isotope Development Center (NIDC) interfaces with the User Community and manages the coordination of isotope production across the facilities and business operations involved in the production, sale, and distribution of isotopes. A virtual center, the NIDC is funded by the Isotope Development and Production for Research and Applications (IDPRA) subprogram of the Office of Nuclear Physics in the U.S. Department of Energy Office of Science. The Isotope subprogram supports the production, and the development of production techniques of radioactive and stable isotopes that are in short supply for research and applications. Isotopes are high-priority commodities of strategic importance for the Nation and are essential for energy, medical, and national security applications and for basic research; a goal of the program is to make critical isotopes more readily available to meet domestic U.S. needs. This subprogram is steward of the Isotope Production Facility (IPF) at Los Alamos National Laboratory (LANL), the Brookhaven Linear Isotope Producer (BLIP) facility at BNL, and hot cell facilities for processing isotopes at ORNL, BNL and LANL. The subprogram also coordinates and supports isotope production at a suite of university, national laboratory, and commercial accelerator and reactor facilities throughout the Nation to promote a reliable supply of domestic isotopes. The National Isotope Development Center (NIDC) at ORNL coordinates isotope production across the many facilities and manages the business operations of the sale and distribution of isotopes.

255

Respiration, photosynthesis, and oxygen isotope fractionation in ...  

Science Journals Connector (OSTI)

Jan 25, 1971 ... Respiration, photosynthesis, and oxygen isotope fractionation in oceanic surface water1. Peter M. Kroopnick. Department of Oceanography,.

2000-01-04T23:59:59.000Z

256

Magnesium Isotope Effects in Enzymatic Phosphorylation  

Science Journals Connector (OSTI)

So far as magnesium isotope effect in phosphorylation is an unexpected and unusual phenomenon, it is worthy to shortly describe materials and technologies used in isotopic biochemical experiments. ... Isotope-containing MgCl2 samples were obtained using treatment of magnesium oxides 24MgO, 25MgO, 26MgO, and *MgO with analytically pure HCl (*Mg means magnesium with natural abundance of the three isotopes; see Table 1). ...

Anatoly L. Buchachenko; Dmitry A. Kouznetsov; Natalia N. Breslavskaya; Marina A. Orlova

2008-02-05T23:59:59.000Z

257

Magnetic Isotope Effect in the Photolysis of Organotin Compounds  

Science Journals Connector (OSTI)

Fractionation of isotopes in chemical and biochemical reactions is induced by two isotope effects; their origin and physical nature are shown in Figure 1. ... The classical isotope effect (CIE) sorts isotopic nuclei on their masses; the magnetic isotope effect (MIE) demonstrates nuclear spin selectivity of reactions and separates isotopic nuclei according to their magnetic moments.1 ...

Anatoly L. Buchachenko; Vladimir L. Ivanov; Vitaly A. Roznyatovsky; Yuri A. Ustynyuk

2006-03-02T23:59:59.000Z

258

Photo-oxidation of Water by Molecular Oxygen: Isotope Exchange and Isotope Effects  

Science Journals Connector (OSTI)

In order to detect the reaction, we used water highly enriched with isotopes 17O and 18O, controlling the isotope composition of molecular oxygen before and after reaction. ... stability of heavy-isotope clumps'; slower kinetics of reactions requiring the breakage of bonds between heavy isotopes; the mass dependence of diffusive and thermo-gravitational fractionations; mixing between components that differ from one another in bulk isotopic compn.; biochem. ... Study of oxygen three-isotope behavior during thermal decompn. of naturally occurring carbonates of calcium and magnesium in vacuo revealed that, surprisingly, anomalous isotopic compns. ...

Anatoly L. Buchachenko; Elena O. Dubinina

2011-03-30T23:59:59.000Z

259

The Measurement of Body Radioactivity: Conference at Leeds  

Science Journals Connector (OSTI)

... Thames water (since this has a considerably lower radioactivity than Stockholm water) and the radon content of the air is reduced by forced ventilation. With these precautions to reduce ... all the differences in radium content. Dr. Hultqvist also described a survey of the radon and thoron content of air in Swedish homes of various building materials3, and showed ...

G. W. REED

1956-07-28T23:59:59.000Z

260

METEORITES AND THE AGE OF THE SOLAR SYSTEM  

Science Journals Connector (OSTI)

... hydrochloric acid. (4) During this process sometimes not only the helium but also the radon liberated from the meteorite was collected and measured5. (5) After dissolution, the radium ... together with barium, as sulphates, and converted into chlorides. (6) The thoron and radon evolved from these chloride solutions were measured in an ioniza-tion chamber connected with an ...

W. J. ARROL; R. B. JACOBI; F. A. PANETH

1942-02-28T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Isotope Evidence for Ozone Formation on Surfaces  

Science Journals Connector (OSTI)

Remarkably, the gas-phase recombination or association reaction of ozone has an unusually large (?10%) isotope effect and shows almost equal enrichments of the ozone molecules containing two different oxygen isotopes. ... For a better understanding of the pressure and temperature dependence of ozone isotopic composition in oxygen discharges, we developed a relatively simple isotope kinetic model that accounts for the processes of (i) heterogeneous ozone formation at the reactor walls, (ii) isotope exchange of oxygen atoms with O2 molecules, and (iii) ozone formation in the gas phase. ...

Christof Janssen; Béla Tuzson

2010-05-06T23:59:59.000Z

262

Magnesium-Isotope Fractionation During Plant Growth  

Science Journals Connector (OSTI)

With three stable isotopes naturally abundant (24Mg, 78.992%; 25Mg, 10.003%; 26Mg, 11.005%), magnesium stable isotope fractionation may provide insights into these cycles. ... Measurements of the magnesium isotopic composition of chlorophylls, seeds, shoots, roots, leaves, exudates, and the limiting nutrient solution over time show that the plant appears to establish an isotopic equilibrium with the nutrient available to it and that the plant (in particular, the seeds and exudates) becomes enriched in the heavy isotopes of magnesium in a mass-dependent relationship as the plant reaches maturity. ...

Jay R. Black; Emanuel Epstein; William D. Rains; Qing-zhu Yin; William H. Casey

2008-10-01T23:59:59.000Z

263

Slow Neutron Scattering by the Titanium Isotopes  

Science Journals Connector (OSTI)

Neutron diffraction studies are reported on isotopically enriched samples of TiO2 from which are evaluated the coherent scattering amplitudes of the titanium isotopes. Scattering amplitudes of +0.48, +0.33, -0.58, +0.08, and +0.55×10-12 cm were established for the titanium isotopes of mass 46, 47, 48, 49, and 50, respectively. The major isotope Ti48 is thus responsible for the anomalous scattering amplitude, -0.34×10-12 cm, characteristic of the normal element. Pronounced nuclear scattering resonance effects on the observed neutron scattering are suggested to occur for most of the isotopes.

C. G. Shull; M. K. Wilkinson; M. H. Mueller

1960-05-01T23:59:59.000Z

264

Isotope Effects in Isotope-Exchange Reactions:? Evidence for a Large 12C/13C Kinetic Isotope Effect in the Gas Phase  

Science Journals Connector (OSTI)

Isotope effects are key to understanding reaction mechanisms because isotopic substitution affects reaction rates and equilibrium constants. ... These values are considered in relation to the vapor pressures of isotopic compds., the geologic abundance of C and O isotopes, the relative abundance of O isotopes in air and H2O, and variations in the at. ...

Giulia de Petris; Anna Troiani

2008-03-05T23:59:59.000Z

265

Definition: Isotopic Analysis- Rock | Open Energy Information  

Open Energy Info (EERE)

Isotopic Analysis- Rock Isotopic Analysis- Rock Jump to: navigation, search Dictionary.png Isotopic Analysis- Rock Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in a given system, while the conditions which increase/decrease the number of neutrons are well understood and measurable.[1] View on Wikipedia Wikipedia Definition References ↑ http://wwwrcamnl.wr.usgs.gov/isoig/isopubs/itchch2.html Ret LikeLike UnlikeLike You like this.Sign Up to see what your friends like. rieved from "http://en.openei.org/w/index.php?title=Definition:Isotopic_Analysis-_Rock&oldid=687702" Category: Definitions What links here Related changes Special pages Printable version Permanent link Browse properties

266

Isotope hydrology of catchment basins: lithogenic and cosmogenic isotopic systems  

SciTech Connect (OSTI)

A variety of physical processes affect solute concentrations within catchment waters. The isotopic compositions of the solutes can indicate which processes have determined the observed concentrations. These processes together constitute the physical history of the water. Many solutes in natural waters are derived from the interaction between the water and the rock and/or soil within the system - these are termed `lithogenic` solutes. The isotopic compositions of these solutes provide information regarding rock-water interactions. Many other solutes have their isotopic compositions determined both within and outside of the catchment - i.e., in addition to being derived from catchment rock and soil, they are solutes that are also transported into the catchment. Important members of this group include solutes that have isotopic compositions produced by atomic particle interactions with other nuclides. The source of the atomic particles can be cosmic radiation (producing `cosmogenic` nuclides in the atmosphere and land surface), anthropogenic nuclear reactions (producing `thermonuclear` nuclides), or radioactive and fission decay of naturally-occurring elements, principally {sup 238}U (producing `in-situ` lithogenic nuclides in the deep subsurface). Current language usage often combines all of the atomic particle-produced nuclides under the heading `cosmogenic nuclides`, and for simplicity we will often follow that usage here, although always indicating which variety is being discussed. This paper addresses the processes that affect the lithogenic and cosmogenic solute concentrations in catchment waters, and how the isotopic compositions of the solutes can be used in integrative ways to identify these processes, thereby revealing the physical history of the water within a catchment system. The concept of a `system` is important in catchment hydrology. A catchment is the smallest landscape unit that can both participate in all of the aspects of the hydrologic cycle and also be treated as a mostly closed system for mass balance considerations. It is the near closure of the system that permits well- constrained chemical mass balance calculations to be made. These calculations generally focus of lithogenic solutes, and therefore in our discussions of lithogenic nuclides in the paper, the concept of chemical mass balance in a nearly dosed system will play an important role. Examination of the isotopic compositions of solutes provides a better understanding of the variety of processes controlling mass balance. It is with this approach that we examined the variety of processes occurring within the catchment system, such as weathering and soil production, generation of stormflow and streamflow (hydrograph separation), movement of soil pore water, groundwater flow, and the overall processes involved with basinal water balance. In this paper, the term `nuclide` will be used when referring to a nuclear species that contains a particular number of protons and neutrons. The term is not specific to any element. The term `isotope` will be used to distinguish nuclear species of a given element (atoms with the same number of protons). That is to say, there are many nuclides in nature - for example, {sup 36}Cl, {sup 87}Sr, {sup 238}U; the element has four naturally-occurring isotopes - {sup 87}Sr, and {sup 88}Sr. This paper will first discuss the general principles that underlie the study of lithogenic and cosmogenic nuclides in hydrology, and provide references to some of the more important studies applying these principles and nuclides. We then turn in the second section to a discussion of their specific applications in catchment- scale systems. The final section of this paper discusses new directions in the application of lithogenic and cosmogenic nuclides to catchment hydrology, with some thoughts concerning possible applications that still remain unexplored.

Nimz, G. J., LLNL

1998-06-01T23:59:59.000Z

267

Kinetic Isotope Effects in Cycloreversion of Rhenium (V) Diolates  

Science Journals Connector (OSTI)

The isotope effects were all calculated from these ratios according to the equation25 (F = extent of reaction; R = isotopic ratio vs reference at extent of reaction F; R0 = initial isotopic ratio vs reference). ... The magnitudes of small kinetic isotope effects (KIEs) are amplified in the isotopic compn. of starting materials recovered from reactions taken to high conversions. ... The magnitudes of small kinetic isotope effects (KIEs) are amplified in the isotopic compn. of starting materials recovered from reactions taken to high conversions. ...

Kevin P. Gable; Fedor A. Zhuravlev

2002-03-21T23:59:59.000Z

268

An investigation of radon exhalation rate and estimation of radiation doses in coal and fly ash samples  

Science Journals Connector (OSTI)

Coal is a technologically important material used for power generation. Its cinder (fly ash) is used in the manufacturing of bricks, sheets, cement, land filling etc. Coal and its by-products often contain significant amounts of radionuclides, including uranium which is the ultimate source of the radioactive gas radon. Burning of coal and the subsequent atmospheric emission cause the redistribution of toxic radioactive trace elements in the environment. In the present study, radon exhalation rates in coal and fly ash samples from the thermal power plants at Kolaghat (W.B.) and Kasimpur (U.P.) have been measured using sealed Can technique having LR-115 type II detectors. The activity concentrations of 238U, 232Th, and 40K in the samples of Kolaghat power station are also measured. It is observed that the radon exhalation rate from fly ash samples from Kolaghat is higher than from coal samples and activity concentration of radionuclides in fly ash is enhanced after the combustion of coal. Fly ash samples from Kasimpur show no appreciable change in radon exhalation. Radiation doses from the fly ash samples have been estimated from radon exhalation rate and radionuclide concentrations.

A.K. Mahur; Rajesh Kumar; Meena Mishra; D. Sengupta; Rajendra Prasad

2008-01-01T23:59:59.000Z

269

In-vivo measurements of Pb-210 to determine cumulative exposure to radon daughters: A pilot study. Final report, 1 March, 1990--May 31, 1991  

SciTech Connect (OSTI)

The objective of this study is to demonstrate the feasibility of estimating cumulative exposure of individuals to low concentrations of radon by measuring the amount of Pb-A-10 in their skeletons. This report presents progress to date establishing the validity of an vivo technique to measure skeletal burdens of Pb-210, accumulated from exposure to radon and radon progeny. With the skeletal content of Pb--210 and a model for Pb metabolism, cumulative exposure to radon and its short-lived daughters (radon/daughters) may be calculated for use in deriving a dose-response relationship between lung cancer and exposure to radon/daughters. Data are presented for 29 subjects exposed to ``above-average`` radon concentrations in their homes, showing the correlation between measured Pb--210 burdens, and measured pCi/l and WLM exposure estimates. Their results are compared to measurements of a population of 24 subject`s presumed exposed to average concentrations. Measurements of a Pennsylvania family exposed for a year in a home with an extremely high radon content are also presented. Update of results of an ongoing study of the biological half-time of Pb--210 in man involving measurements, of a retired radiation worker with a 40 year old skeletal burden of Pb-210.

Laurer, G.R.; Cohen, N. [New York Univ. Medical Center, Tuxedo, NY (United States). Dept. of Environmental Medicine; Stark, A.; Ju, C. [New York State Dept. of Health, Albany, NY (United States). Bureau of Environmental and Occupational Epidemiology

1991-05-01T23:59:59.000Z

270

Fusion reactions with germanium isotopes  

Science Journals Connector (OSTI)

Measurements of the fusion of 16O and 27Al with a series of germanium isotopes are analyzed within a coupled-channels approach. It is found that couplings based interactions that are linear in the deformation amplitudes are insufficient in reproducing the data. In order to obtain reasonable fits, it is necessary also to include couplings based on quadratic interactions. The analysis suggests that the nuclear radius of 72Ge is significantly smaller than predicted from a smooth interpolation between other germanium isotopes. The large prolate deformation of 74Ge, which has been proposed as the preferred solution to measurements of the quadrupole moment of the 2+ state, is not supported by the analysis; the near spherical solution is more likely.

H. Esbensen

2003-09-04T23:59:59.000Z

271

Magnesium Isotopes in Halo Stars  

E-Print Network [OSTI]

We have determined Mg isotope ratios in halo field dwarfs and giants in the globular cluster M71 based on high S/N high spectral resolution (R = 10$^5$) Keck HIRES spectra. Unlike previous claims of an important contribution from intermediate-mass AGB stars to the Galactic halo, we find that our $^{26}$Mg/$^{24}$Mg ratios can be explained by massive stars.

Jorge Melendez; Judith G. Cohen

2007-08-29T23:59:59.000Z

272

Nuclear Energy Protocol for Research Isotopes Owen Lowe  

Broader source: Energy.gov (indexed) [DOE]

Protocol for Protocol for Research Isotopes Owen Lowe Office of Isotopes for Medicine and Science Office of Nuclear Energy, Science and Technology April 16, 2002 Isotopes for Life Isotopes for Life Isotopes for Life Office of Nuclear Energy, Science and Technology Lowe/April16_02 NEPRI to NERAC.ppt (2) Nuclear Energy Protocol For Research Isotopes Nuclear Energy Protocol For Research Isotopes Why NEPRI? 6 NEPRI implements DOE funding priorities for fiscal year 2003 6 NEPRI will * Bring order to DOE's responses to requests for research isotopes * Introduce a high-quality peer review to the selection of research isotopes * Enable DOE to concentrate on operating its unique isotope production facilities Isotopes for Life Isotopes for Life Isotopes for Life Office of Nuclear Energy, Science and Technology

273

The ENVIRAD project: a way to control and to teach how to protect from high indoor radon level  

Science Journals Connector (OSTI)

The environmental radioactivity (ENVIRAD) project involves students of Italian secondary schools with the aim to make them acquainted with the radon measurement techniques. The first step of the project has consisted of the introduction of the participants into some themes not treated in usual curricula to supply the student with the cultural skill to carry out survey about radon concentrations in the school and eventually in other buildings. The second ENVIRAD's part is the creation of a network for the continuous on-line measurements of radon exhalation from soil for geophysical applications. The feasibility of the project has been verified by 1-year work with a pilot school during the season 2002/2003. In the following year, 18 schools will join the project.

A.M. Esposito; M. Ambrosio; E. Balzano; L. Gialanella; M. Pugliese; V. Roca; M. Romano; C. Sabbarese; G. Venoso

2005-01-01T23:59:59.000Z

274

Strategic Isotope Production | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Strategic Isotope Strategic Isotope Production SHARE Strategic Isotope Production Typical capsules used in the transport of 252Cf source material inside heavily shielded shipping casks. ORNL's unique facilities at the High Flux Isotope Reactor (HFIR), Radiochemical Engineering Development Center (REDC), Irradiated Fuels Examination Laboratory (IFEL), and Irradiated Materials Examination Testing facility (IMET) are routinely used in the production, purification, packaging, and shipping of a number of isotopes of national importance, including: 75Se, 63Ni, 238Pu, 252Cf, and others. The intense neutron flux of the HFIR (2.0 x 1015 neutrons/cm²·s) permits the rapid formation of such isotopes. These highly irradiated materials are then processed and packaged for shipping using the facilities at the REDC, IFEL, and IMET.

275

Electromagnetic Isotope Separation Lab (EMIS) | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electromagnetic Isotope Separation Lab Electromagnetic Isotope Separation Lab May 30, 2013 ORNL established the Stable Isotope Enrichment Laboratory (SIEL) as part of a project funded by the DOE Office of Science, Nuclear Physics Program to develop a modernized electromagnetic isotope separator (EMIS), optimized for separation of a wide range of stable isotopes. The SIEL is located in the Building 6010 Shield Test Station, space formerly allocated to the Oak Ridge Electron Linear Accelerator, on the main campus of ORNL. ORNL staff have designed and built a nominal 10 mA ion current EMIS (sum of all isotopes at the collector) in the SIEL. This EMIS is currently being tested to determine basic performance metrics such as throughput and enrichment factor per pass. This EMIS unit and space will be used to

276

Enforcement Letter, International Isotopes Idaho Inc - August...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Isotopes Idaho, Inc. related to the Relocation of an Irradiated Pellet at the Test Reactor Area Hot Cell Facility at the Idaho National Engineering and Environmental...

277

EIS-0249: Medical Isotopes Production Project  

Broader source: Energy.gov [DOE]

This EIS evaluates the potential environmental impacts of a proposal to establish a production capability for molybdenum-99 (Mo-99) and related medical isotopes.

278

Category:Isotope Geothermometry | Open Energy Information  

Open Energy Info (EERE)

Login | Sign Up Search Category Edit History Facebook icon Twitter icon Category:Isotope Geothermometry Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home...

279

Integration of Nontraditional Isotopic Systems Into Reaction...  

Broader source: Energy.gov (indexed) [DOE]

minerals in geothermal systems (feldspars, epidote, and calcite) often control fracture permeability changes. Measurements of Ca and Sr isotopic fractionation at high...

280

Science with Beams of Radioactive Isotopes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2015 The International Chemical Congress of Pacific Basin Societies Science with Beams of Radioactive Isotopes ( 340) Honolulu, Hawaii, USA December 15-20, 2015 Science...

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Integration of Nontraditional Isotopic Systems Into Reaction...  

Broader source: Energy.gov (indexed) [DOE]

of EGS For Exploration, Evaluation of Water-Rock Interaction, and Impacts of Water Chemistry on Reservoir Sustainability Integration of Nontraditional Isotopic Systems Into...

282

Research with fast radioactive isotope beams at RIKEN  

Science Journals Connector (OSTI)

......moments of neutron-rich boron isotopes were measured by the...many neutron-rich isotopes. To exploit fully the...most straightforward determination of the charge distribution...called KISS (KEK isotope separation system......

Tohru Motobayashi; Hiroyoshi Sakurai

2012-01-01T23:59:59.000Z

283

Isotope-Selective Detection and Imaging of Organic Nanolayers  

Science Journals Connector (OSTI)

Isotope-Selective Detection and Imaging of Organic Nanolayers ... We show isotopic selectivity of MRFM for three nuclei, 1H, 31P, and 13C, in organic materials. ... data to further distinguish and characterize the 2 isotopes. ...

H. J. Mamin; T. H. Oosterkamp; M. Poggio; C. L. Degen; C. T. Rettner; D. Rugar

2009-07-09T23:59:59.000Z

284

Solvent Isotope-Induced Equilibrium Perturbation for Isocitrate Lyase  

Science Journals Connector (OSTI)

Solvent Isotope-Induced Equilibrium Perturbation for Isocitrate Lyase ... Solvent isotopic composition can influence both the rates of enzyme-catalyzed reactions (solvent kinetic isotope effects) and, in the case of solvent-derived deuterium incorporation into nonexchangeable C–H bonds in products, solvent equilibrium isotope effects. ... In this study, we report the solvent isotope-induced transient change in the concentration and isotopic composition of the reactants. ...

Christine E. Quartararo; Timin Hadi; Sean M. Cahill; John S. Blanchard

2013-11-21T23:59:59.000Z

285

CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope...  

Broader source: Energy.gov (indexed) [DOE]

Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C to DOE G...

286

CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope...  

Broader source: Energy.gov (indexed) [DOE]

Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of...

287

CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope...  

Broader source: Energy.gov (indexed) [DOE]

Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR...

288

CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope...  

Broader source: Energy.gov (indexed) [DOE]

Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR...

289

CRAD, Management- Oak Ridge National Laboratory High Flux Isotope...  

Broader source: Energy.gov (indexed) [DOE]

Management- Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Management- Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C...

290

Stable Isotope, Site-Specific Mass Tagging For Protein Identification  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Stable Isotope, Site-Specific Mass Tagging For Protein Identification Stable Isotope, Site-Specific Mass Tagging For Protein Identification Proteolytic peptide mass mapping as...

291

Enriched Stable Isotope Materials and Chemistry | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Enriched Stable Isotope Materials and Chemistry SHARE Enriched Stable Isotope Materials and Chemistry Reductiondistillation of calcium-48 metal valued at over 900,000. An...

292

Isotopic Analysis- Gas At Chena Geothermal Area (Kolker, Et Al...  

Open Energy Info (EERE)

Laboratory sampling and analysis of He isotopes from Chena Hot Springs. Notes Helium isotope measurements indicate there is no magmatic or mantle input at the Chena Geothermal...

293

Development of a Micropyrolyzer for Enhanced Isotope Ratio Measurement...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Micropyrolyzer for Enhanced Isotope Ratio Measurement. Development of a Micropyrolyzer for Enhanced Isotope Ratio Measurement. Abstract: This paper presents design, fabrication and...

294

The Quest for the Heaviest Uranium Isotope  

E-Print Network [OSTI]

We study Uranium isotopes and surrounding elements at very large neutron number excess. Relativistic mean field and Skyrme-type approaches with different parametrizations are used in the study. Most models show clear indications for isotopes that are stable with respect to neutron emission far beyond N=184 up to the range of around N=258.

S. Schramm; D. Gridnev; D. V. Tarasov; V. N. Tarasov; W. Greiner

2011-07-06T23:59:59.000Z

295

Advanced Mass Spectrometers for Hydrogen Isotope Analyses  

SciTech Connect (OSTI)

This report is a summary of the results of a joint Savannah River Laboratory (SRL) - Savannah River Plant (SRP) ''Hydrogen Isotope Mass Spectrometer Evaluation Program''. The program was undertaken to evaluate two prototype hydrogen isotope mass spectrometers and obtain sufficient data to permit SRP personnel to specify the mass spectrometers to replace obsolete instruments.

Chastagner, P.

2001-08-01T23:59:59.000Z

296

Isotopes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

are saving lives, advancing cutting-edge research and keeping the U.S. safe. Strontium-82 produced at Los Alamos is used in hospitals nation- and world-wide for critical...

297

ISOTOPES  

E-Print Network [OSTI]

Research, Division of Nuclear Sciences of the Basic Energy Sciences ProgramResearch, Division of Nuclear Sciences of the Basic Energy Sciences Program

Lederer, C. Michael

2013-01-01T23:59:59.000Z

298

ISOTOPES  

E-Print Network [OSTI]

5-7. 1975, British Nuclear Engineering Society (1975). 87.London, March British Nuclear Engineering Society (1975).T.H. Pigford, Nuclear Chemical Engineering (1St edition),

Lederer, C. Michael

2013-01-01T23:59:59.000Z

299

ISOTOPES  

E-Print Network [OSTI]

uranium, heavy-water-moderated CANDU reactor, as contrastedis important, and in the CANDU power reactor, which uses

Lederer, C. Michael

2013-01-01T23:59:59.000Z

300

Device and method for separating oxygen isotopes  

DOE Patents [OSTI]

A device and method for separating oxygen isotopes with an ArF laser which produces coherent radiation at approximately 193 nm. The output of the ArF laser is filtered in natural air and applied to an irradiation cell where it preferentially photodissociates molecules of oxygen gas containing .sup.17 O or .sup.18 O oxygen nuclides. A scavenger such as O.sub.2, CO or ethylene is used to collect the preferentially dissociated oxygen atoms and recycled to produce isotopically enriched molecular oxygen gas. Other embodiments utilize an ArF laser which is narrowly tuned with a prism or diffraction grating to preferentially photodissociate desired isotopes. Similarly, desired mixtures of isotopic gas can be used as a filter to photodissociate enriched preselected isotopes of oxygen.

Rockwood, Stephen D. (Los Alamos, NM); Sander, Robert K. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Selected Isotopes for Optimized Fuel Assembly Tags  

SciTech Connect (OSTI)

In support of our ongoing signatures project we present information on 3 isotopes selected for possible application in optimized tags that could be applied to fuel assemblies to provide an objective measure of burnup. 1. Important factors for an optimized tag are compatibility with the reactor environment (corrosion resistance), low radioactive activation, at least 2 stable isotopes, moderate neutron absorption cross-section, which gives significant changes in isotope ratios over typical fuel assembly irradiation levels, and ease of measurement in the SIMS machine 2. From the candidate isotopes presented in the 3rd FY 08 Quarterly Report, the most promising appear to be Titanium, Hafnium, and Platinum. The other candidate isotopes (Iron, Tungsten, exhibited inadequate corrosion resistance and/or had neutron capture cross-sections either too high or too low for the burnup range of interest.

Gerlach, David C.; Mitchell, Mark R.; Reid, Bruce D.; Gesh, Christopher J.; Hurley, David E.

2008-10-01T23:59:59.000Z

302

Radon monitoring in groundwater samples from some areas of northern Rajasthan, India, using a RAD7 detector  

Science Journals Connector (OSTI)

......and groundwater. Natural water contains dissolved...rocks(1). Radon gas and its radioactive...water samples from Cyprus and Greece in the...16.29.3 (8) Cyprus 0.3-20 5.9...water in Greece and Cyprus: implications to...water from various natural sources using nuclear......

Asha Rani; Rohit Mehra; Vikas Duggal

2013-03-01T23:59:59.000Z

303

The Dispersion of Radon Above Deeply Buried Uranium Ore: Millennium Deposit, Athabasca Basin, SK , K Hattori1  

E-Print Network [OSTI]

The Dispersion of Radon Above Deeply Buried Uranium Ore: Millennium Deposit, Athabasca Basin, SK M, Ottawa, ON, 2 Cameco Corporation, Saskatoon, SK Depth Profiles Canada Mining Innovation Council Natural., Portella, P., Olson, R.A., 2007. Unconformity- associated uranium deposits of the Athabasca Basin

304

A pilot study of the dependence of radon concentration on the tectonic structures, using simple geophysical methods  

Science Journals Connector (OSTI)

......concentration of 40K and uranium is more or less stable. The low radon and uranium concentrations measured...supported by the research plan MSM6840770040 of...McMurry P. H. A review of atmospheric aerosol...Plastino W. , et al. Uranium groundwater anomalies...main unit with standard accessories, multi-electrode......

L. Thinova; A. Fronka; K. Rovenska

2011-05-01T23:59:59.000Z

305

Residential Radon Exposure, Histologic Types, and Lung Cancer Risk. A Case–Control Study in Galicia, Spain  

Science Journals Connector (OSTI)

...a federal action plan for saving lives...Radon_Action_Plan.pdf . 6. A citizen's...exposure? A systematic review.Int J Radiat Biol...and American Indian uranium miners: an update...carcinoma in German uranium miners.Cancer 2006...was measured using standard procedures. Results...

Juan Miguel Barros-Dios; Alberto Ruano-Ravina; Mónica Pérez-Ríos; Margarita Castro-Bernárdez; Jose Abal-Arca; and Marta Tojo-Castro

2012-06-01T23:59:59.000Z

306

Residential Radon Exposure, Histologic Types, and Lung Cancer Risk. A Case–Control Study in Galicia, Spain  

Science Journals Connector (OSTI)

...in miners (WISMUT Mining Company) have revealed...Perez-Rios Writing, review, and/or revision...a federal action plan for saving lives...Radon_Action_Plan.pdf . 6. A citizen's...exposure? A systematic review.Int J Radiat Biol...was measured using standard procedures. Results...

Juan Miguel Barros-Dios; Alberto Ruano-Ravina; Mónica Pérez-Ríos; Margarita Castro-Bernárdez; Jose Abal-Arca; and Marta Tojo-Castro

2012-06-01T23:59:59.000Z

307

Radon concentration in drinking water and supplementary exposure in Bia-tei mining area, Bihor county (Romania)  

Science Journals Connector (OSTI)

......partially of the Sectoral Operational Programme-Increase of Economic Competitiveness co-financed by the European Regional Development...Heloisa F. Radon (222Rn) concentration in indoor air near the coal mining area of Nui Beo, North of Vietnam. J. Environ. Radioact......

Mircea Moldovan; Dan Constantin Nita; Alexandra Cucos-Dinu; Tiberius Dicu; Nicoleta Bican-Brisan; Constantin Cosma

2014-03-01T23:59:59.000Z

308

Atomic vapor laser isotope separation of lead-210 isotope  

DOE Patents [OSTI]

An isotopically selective laser process and apparatus for removal of Pb-210 from natural lead that involves a one-photon near-resonant, two-photon resonant excitation of one or more Rydberg levels, followed by field ionization and then electrostatic extraction. The wavelength to the near-resonant intermediate state is counter propagated with respect to the second wavelength required to populate the final Rydberg state. This scheme takes advantage of the large first excited state cross section, and only modest laser fluences are required. The non-resonant process helps to avoid two problems: first, stimulated Raman Gain due to the nearby F=3/2 hyperfine component of Pb-207 and, second, direct absorption of the first transition process light by Pb-207.

Scheibner, Karl F. (Tracy, CA); Haynam, Christopher A. (Pleasanton, CA); Johnson, Michael A. (Pleasanton, CA); Worden, Earl F. (Diablo, CA)

1999-01-01T23:59:59.000Z

309

Atomic vapor laser isotope separation of lead-210 isotope  

DOE Patents [OSTI]

An isotopically selective laser process and apparatus for removal of Pb-210 from natural lead that involves a one-photon near-resonant, two-photon resonant excitation of one or more Rydberg levels, followed by field ionization and then electrostatic extraction. The wavelength to the near-resonant intermediate state is counter propagated with respect to the second wavelength required to populate the final Rydberg state. This scheme takes advantage of the large first excited state cross section, and only modest laser fluences are required. The non-resonant process helps to avoid two problems: first, stimulated Raman Gain due to the nearby F=3/2 hyperfine component of Pb-207 and, second, direct absorption of the first transition process light by Pb-207. 5 figs.

Scheibner, K.F.; Haynam, C.A.; Johnson, M.A.; Worden, E.F.

1999-08-31T23:59:59.000Z

310

E-Print Network 3.0 - alpha-particle-emitting isotope 259db Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Department of Chemistry, Texas A&M University Collection: Physics 2 A study of the polyethylene membrane used in diffusion chambers for radon gas concentration measurements...

311

Isotopic composition of Silurian seawater  

SciTech Connect (OSTI)

Direct isotopic analyses of 21 samples of the Silurian hydrosphere preserved as fluid inclusions in Silurian halite deposits in the Michigan Basin Salina Group yield delta/sup 18/O, deltaD ranging from 0.2 to +5.9 and -26 to -73, respectively. delta/sup 18/O has the same range as observed for modern halite facies evaporite waters and is a few per thousand higher than 100 analyses of fluid inclusions in Permian halite. deltaD is about 20 to 30 per thousand lower than modern and Permian examples. The trajectory of evaporating seawater on a deltaD-delta/sup 18/O diagram initially has a positive slope of 3-6, but hooks strongly downward to negative values, the shape of the hook depending upon humidity. Halite begins to precipitate at delta values similar to those observed for the most /sup 18/O rich fluid inclusions. Subsequent evaporation yields progressively more negative delta values as observed for the fluid inclusions. The fluid inclusion data can be readily explained in terms of evaporating seawater and are consistent with the degree of evaporation deduced from measured bromide profiles. These data are strongly inconsistent with arguments that Silurian seawater was 5.5 per thousand depleted in /sup 18/O. delta/sup 18/O for evaporite waters is systematically related to that of seawater, and does not show a -5.5 per thousand shift in the Silurian, even allowing for variables which affect the isotope evaporation trajectory. The lower deltaD may indicate a component of gypsum dehydration waters or may suggest a D-depleted Silurian hydrosphere.

Knauth, L.P.; Kealy, S.; Larimer, S.

1985-01-01T23:59:59.000Z

312

Assessment of radon concentration and external gamma radiation level in the environs of Narwapahar uranium mine, India and its radiological significance  

Science Journals Connector (OSTI)

In the environs of uranium mining, milling and processing facilities and in the uranium mineralized terrain, a little higher ambient radon concentration and gamma radiation level may be expected in comparison ...

B. K. Rana; R. M. Tripathi; J. S. Meena…

2011-11-01T23:59:59.000Z

313

Laser Ablation Molecular Isotopic Spectrometry: Parameter influence on boron isotope measurements  

Science Journals Connector (OSTI)

Laser Ablation Molecular Isotopic Spectrometry (LAMIS) was recently reported for optical isotopic analysis of condensed samples in ambient air and at ambient pressure. LAMIS utilizes molecular emissions which exhibit larger isotopic spectral shits than in atomic transitions. For boron monoxide 10BO and 11BO, the isotopic shifts extend from 114 cm?1 (0.74 nm) to 145–238 cm?1 (5–8 nm) at the B 2?+ (v = 0) ? X 2?+ (v = 2) and A 2?i (v = 0) ? X 2?+ (v = 3) transitions, respectively. These molecular isotopic shifts are over two orders of magnitude larger than the maximum isotopic shift of approximately 0.6 cm?1 in atomic boron. This paper describes how boron isotope abundance can be quantitatively determined using LAMIS and how atomic, ionic, and molecular optical emission develops in a plasma emanating from laser ablation of solid samples with various boron isotopic composition. We demonstrate that requirements for spectral resolution of the measurement system can be significantly relaxed when the isotopic abundance ratio is determined using chemometric analysis of spectra. Sensitivity can be improved by using a second slightly delayed laser pulse arriving into an expanding plume created by the first ablation pulse.

Xianglei Mao; Alexander A. Bol'shakov; Dale L. Perry; Osman Sorkhabi; Richard E. Russo

2011-01-01T23:59:59.000Z

314

It's Elemental - Isotopes of the Element Magnesium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sodium Sodium Previous Element (Sodium) The Periodic Table of Elements Next Element (Aluminum) Aluminum Isotopes of the Element Magnesium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 24 78.99% STABLE 25 10.00% STABLE 26 11.01% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 19 4.0 picoseconds Double Proton Emission 100.00% 20 90.8 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission ~ 27.00% 21 122 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 32.60% Electron Capture with delayed Alpha Decay < 0.50%

315

It's Elemental - Isotopes of the Element Chlorine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sulfur Sulfur Previous Element (Sulfur) The Periodic Table of Elements Next Element (Argon) Argon Isotopes of the Element Chlorine [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 35 75.76% STABLE 37 24.24% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 28 No Data Available Proton Emission (suspected) No Data Available 29 < 20 nanoseconds Proton Emission No Data Available 30 < 30 nanoseconds Proton Emission No Data Available 31 150 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 0.70% 32 298 milliseconds Electron Capture 100.00%

316

It's Elemental - Isotopes of the Element Potassium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Argon Argon Previous Element (Argon) The Periodic Table of Elements Next Element (Calcium) Calcium Isotopes of the Element Potassium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 39 93.2581% STABLE 40 0.0117% 1.248×10+9 years 41 6.7302% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 32 No Data Available Proton Emission (suspected) No Data Available 33 < 25 nanoseconds Proton Emission No Data Available 34 < 25 nanoseconds Proton Emission No Data Available 35 178 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 0.37% 36 342 milliseconds Electron Capture 100.00%

317

It's Elemental - Isotopes of the Element Phosphorus  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Silicon Silicon Previous Element (Silicon) The Periodic Table of Elements Next Element (Sulfur) Sulfur Isotopes of the Element Phosphorus [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 31 100% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 24 No Data Available Electron Capture (suspected) No Data Available Proton Emission (suspected) No Data Available 25 < 30 nanoseconds Proton Emission 100.00% 26 43.7 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission No Data Available 27 260 milliseconds Electron Capture 100.00% Electron Capture with

318

It's Elemental - Isotopes of the Element Oxygen  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nitrogen Nitrogen Previous Element (Nitrogen) The Periodic Table of Elements Next Element (Fluorine) Fluorine Isotopes of the Element Oxygen [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 16 99.757% STABLE 17 0.038% STABLE 18 0.205% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 12 1.139×10-21 seconds Proton Emission No Data Available 13 8.58 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 100.00% 14 70.620 seconds Electron Capture 100.00% 15 122.24 seconds Electron Capture 100.00% 16 STABLE - - 17 STABLE - - 18 STABLE - - 19 26.88 seconds Beta-minus Decay 100.00%

319

It's Elemental - Isotopes of the Element Gallium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Zinc Zinc Previous Element (Zinc) The Periodic Table of Elements Next Element (Germanium) Germanium Isotopes of the Element Gallium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 69 60.108% STABLE 71 39.892% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 56 No Data Available Proton Emission (suspected) No Data Available 57 No Data Available Proton Emission (suspected) No Data Available 58 No Data Available Proton Emission (suspected) No Data Available 59 No Data Available Proton Emission (suspected) No Data Available 60 70 milliseconds Electron Capture 98.40%

320

It's Elemental - Isotopes of the Element Sodium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Neon Neon Previous Element (Neon) The Periodic Table of Elements Next Element (Magnesium) Magnesium Isotopes of the Element Sodium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 23 100% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 18 1.3×10-21 seconds Proton Emission 100.00% 19 < 40 nanoseconds Proton Emission No Data Available 20 447.9 milliseconds Electron Capture with delayed Alpha Decay 20.05% Electron Capture 100.00% 21 22.49 seconds Electron Capture 100.00% 22 2.6027 years Electron Capture 100.00% 23 STABLE - - 24 14.997 hours Beta-minus Decay 100.00%

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

It's Elemental - Isotopes of the Element Neon  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Fluorine Fluorine Previous Element (Fluorine) The Periodic Table of Elements Next Element (Sodium) Sodium Isotopes of the Element Neon [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 20 90.48% STABLE 21 0.27% STABLE 22 9.25% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 16 9×10-21 seconds Double Proton Emission 100.00% 17 109.2 milliseconds Electron Capture with delayed Alpha Decay No Data Available Electron Capture 100.00% Electron Capture with delayed Proton Emission 100.00% 18 1.6670 seconds Electron Capture 100.00% 19 17.22 seconds Electron Capture 100.00% 20 STABLE - -

322

It's Elemental - Isotopes of the Element Copper  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nickel Nickel Previous Element (Nickel) The Periodic Table of Elements Next Element (Zinc) Zinc Isotopes of the Element Copper [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 63 69.15% STABLE 65 30.85% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 52 No Data Available Proton Emission No Data Available 53 < 300 nanoseconds Electron Capture No Data Available Proton Emission No Data Available 54 < 75 nanoseconds Proton Emission No Data Available 55 27 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 15.0% 56 93 milliseconds Electron Capture 100.00%

323

It's Elemental - Isotopes of the Element Boron  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Beryllium Beryllium Previous Element (Beryllium) The Periodic Table of Elements Next Element (Carbon) Carbon Isotopes of the Element Boron [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 10 19.9% STABLE 11 80.1% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 6 No Data Available Double Proton Emission (suspected) No Data Available 7 3.255×10-22 seconds Proton Emission No Data Available Alpha Decay No Data Available 8 770 milliseconds Electron Capture 100.00% Electron Capture with delayed Alpha Decay 100.00% 9 8.439×10-19 seconds Proton Emission 100.00% Double Alpha Decay 100.00%

324

It's Elemental - Isotopes of the Element Tungsten  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tantalum Tantalum Previous Element (Tantalum) The Periodic Table of Elements Next Element (Rhenium) Rhenium Isotopes of the Element Tungsten [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 180 0.12% >= 6.6×10+17 years 182 26.50% STABLE 183 14.31% > 1.3×10+19 years 184 30.64% STABLE 186 28.43% > 2.3×10+19 years Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 157 275 milliseconds Electron Capture No Data Available 158 1.25 milliseconds Alpha Decay 100.00% 158m 0.143 milliseconds Isomeric Transition No Data Available Alpha Decay No Data Available 159 7.3 milliseconds Alpha Decay ~ 99.90%

325

It's Elemental - Isotopes of the Element Carbon  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Boron Boron Previous Element (Boron) The Periodic Table of Elements Next Element (Nitrogen) Nitrogen Isotopes of the Element Carbon [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 12 98.93% STABLE 13 1.07% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 8 1.981×10-21 seconds Proton Emission 100.00% Alpha Decay No Data Available 9 126.5 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 61.60% Electron Capture with delayed Alpha Decay 38.40% 10 19.308 seconds Electron Capture 100.00% 11 20.334 minutes Electron Capture 100.00% 12 STABLE - -

326

It's Elemental - Isotopes of the Element Rhenium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tungsten Tungsten Previous Element (Tungsten) The Periodic Table of Elements Next Element (Osmium) Osmium Isotopes of the Element Rhenium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 185 37.40% STABLE 187 62.60% 4.33×10+10 years Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 159 No Data Available No Data Available No Data Available 160 0.82 milliseconds Proton Emission 91.00% Alpha Decay 9.00% 161 0.44 milliseconds Proton Emission 100.00% Alpha Decay <= 1.40% 161m 14.7 milliseconds Alpha Decay 93.00% Proton Emission 7.00% 162 107 milliseconds Alpha Decay 94.00% Electron Capture 6.00%

327

Isotope ratio determination in boron analysis  

Science Journals Connector (OSTI)

Traditionally, boron (B) isotope ratios have been determined using thermal ionization...+, Cs+, or O-...for analyte ionization. TIMS can be used in negative or positive ion modes with high sensitivity and precisi...

Ram N. Sah; Patrick H. Brown

1998-12-01T23:59:59.000Z

328

Magnetic moments of long isotopic chains  

E-Print Network [OSTI]

Dipole magnetic moments of several long isotopic chains are analyzed within the self-consistent Finite Fermi System theory based on the Generalized Energy Density Functional method with exact account for the pairing and quasi-particle continuum. New data for nuclei far from the beta-stability valley are included in the analysis. For a number of semi-magic isotopes of the tin and lead chains a good description of the data is obtained, with accuracy of 0.1 - 0.2 mu_N. A chain of non-magic isotopes of copper is also analyzed in detail. It is found that the systematic analysis of magnetic moments of this long chain yields rich information on the evolution of the nuclear structure of the Cu isotopes. In particular, it may give a signal of deformation for the ground state of some nuclei in the chain.

I. N. Borzov; E. E. Saperstein; S. V. Tolokonnikov; G. Neyens; N. Severijns

2008-04-28T23:59:59.000Z

329

ICE CORE RECORDS | Greenland Stable Isotopes  

Science Journals Connector (OSTI)

Abstract Greenland ice cores contain a wealth of information on past climatic conditions throughout the Northern Hemisphere. A historical perspective on the climatic interpretation of stable isotopes in water and ice is presented in the introduction, while the remainder of the article is devoted to the current interpretation of stable isotope data from Greenland ice cores. The progress in our understanding of stable isotope signals, on timescales from seasons to glacial cycles, is discussed and evaluated through numerous examples from Greenland ice cores. Stable isotope profiles from the Camp Century, Dye-3, GISP2, GRIP, NGRIP, and Renland deep ice cores are emphasized, as they all provide climatic information dating back into the Eemian period.

B.M. Vinther; S.J. Johnsen

2013-01-01T23:59:59.000Z

330

Nuclear Astrophysics in Rare Isotope Facilities  

E-Print Network [OSTI]

Nuclear reactions in stars are difficult to measure directly in the laboratory at the small astrophysical energies. In recent years indirect methods with rare isotopes have been developed and applied to extract low-energy astrophysical cross sections.

C. A. Bertulani

2009-11-02T23:59:59.000Z

331

Gaseous isotope separation using solar wind phenomena  

Science Journals Connector (OSTI)

...isotope separation using solar wind phenomena Chia-Gee...essentially the same as that of the solar wind propagation, in which...the author was measuring solar wind parameters under Dr. H. S. Bridge at Massachusetts Institute of Technology in...

Chia-Gee Wang

1980-01-01T23:59:59.000Z

332

NONRADIOGENIC ISOTOPES IN GEOLOGY: A REVIEW  

Science Journals Connector (OSTI)

...has revised Brown's figures. Seaborg and Pearlman (1948) and more recently...51, p. 263-300. and Jenks, Glenn (1944) Isotopic composition of...Science,vol. 79, p. 565. Seaborg, Glenn T., and Pearlman, I. (1948...

333

Storage of Hydrogen Isotopes in Uranium Alloys  

Science Journals Connector (OSTI)

Tritium Properties and Interactions with Material / Proceedings of the Third Topical Meeting on Tritium Technology in Fission, Fusion and Isotopic Applications (Toronto, Ontario, Canada, May 1-6, 1988)

T. Yamamoto; Supardjo; T. Terai; F. Ono; S. Tanaka; M. Yamawaki

334

HIGH TEMPERATURE TREATMENT OF INTERMEDIATE-LEVEL RADIOACTIVE WASTES - SIA RADON EXPERIENCE  

SciTech Connect (OSTI)

This review describes high temperature methods of low- and intermediate-level radioactive waste (LILW) treatment currently used at SIA Radon. Solid and liquid organic and mixed organic and inorganic wastes are subjected to plasma heating in a shaft furnace with formation of stable leach resistant slag suitable for disposal in near-surface repositories. Liquid inorganic radioactive waste is vitrified in a cold crucible based plant with borosilicate glass productivity up to 75 kg/h. Radioactive silts from settlers are heat-treated at 500-700 0C in electric furnace forming cake following by cake crushing, charging into 200 L barrels and soaking with cement grout. Various thermochemical technologies for decontamination of metallic, asphalt, and concrete surfaces, treatment of organic wastes (spent ion-exchange resins, polymers, medical and biological wastes), batch vitrification of incinerator ashes, calcines, spent inorganic sorbents, contaminated soil, treatment of carbon containing 14C nuclide, reactor graphite, lubricants have been developed and implemented.

Sobolev, I.A.; Dmitriev, S.A.; Lifanov, F.A.; Kobelev, A.P.; Popkov, V.N.; Polkanov, M.A.; Savkin, A.E.; Varlakov, A.P.; Karlin, S.V.; Stefanovsky, S.V.; Karlina, O.K.; Semenov, K.N.

2003-02-27T23:59:59.000Z

335

Robust Hydraulic Fracture Monitoring (HFM) of Multiple Time Overlapping Events Using a Generalized Discrete Radon Transform  

E-Print Network [OSTI]

In this work we propose a novel algorithm for multiple-event localization for Hydraulic Fracture Monitoring (HFM) through the exploitation of the sparsity of the observed seismic signal when represented in a basis consisting of space time propagators. We provide explicit construction of these propagators using a forward model for wave propagation which depends non-linearly on the problem parameters - the unknown source location and mechanism of fracture, time and extent of event, and the locations of the receivers. Under fairly general assumptions and an appropriate discretization of these parameters we first build an over-complete dictionary of generalized Radon propagators and assume that the data is well represented as a linear superposition of these propagators. Exploiting this structure we propose sparsity penalized algorithms and workflow for super-resolution extraction of time overlapping multiple seismic events from single well data.

Ely, Gregory

2013-01-01T23:59:59.000Z

336

Mechanistic studies using kinetic isotope effects  

E-Print Network [OSTI]

MECHANISTIC STUDIES USING KINETIC ISOTOPE EFFECTS A Thesis by BRIAN E. SCHULMFIER Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requtrements for the degree of MASTER OF SCIENCE December... 1999 Major Subject: Chemistry MECHANISTIC STUDIES USING KINETIC ISOTOPE EFFECTS A Thesis by BRIAN E. SCHULMEIER Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved...

Schulmeier, Brian E.

2012-06-07T23:59:59.000Z

337

Isotope/element fractionation during surface adsorption  

Science Journals Connector (OSTI)

The adsorption of ions onto mineral surfaces accompanies isotope/element fractionation in planets and asteroids. A model based on simple classical physics is presented to predict these fractionations. The agreement between the experimentally observed isotope/element ratios and their predicted values is found to be excellent. This fractionation can be demonstrated experimentally in advanced physics laboratories using macroscopic particles. The success of the model shows students that even a very complex naturally occurring process can be explained quantitatively with simple physics.

Gamini Seneviratne; Asiri Nanayakkara

2004-01-01T23:59:59.000Z

338

Manifestation and Origin of the Isotope Effect  

E-Print Network [OSTI]

This article reviews from one point of view the current status of the manifestations of isotope effect in a nuclear, atomic and molecular as well as solid state physics. Although these manifestations vary, they have one common feature - they all depend on mass. At present time the Standard Model can't explain the origin of the mass of elementary particles and their hierarchy. The last one don't permit to find the origin of the isotope effect.

V. G. Plekhanov

2009-07-12T23:59:59.000Z

339

The Oxygen core inside the Magnesium isotopes  

E-Print Network [OSTI]

We have studied the ground state bulk properties of magnesium isotopes using axially symmetric relativistic mean field formalism. The BCS pairing approach is employed to take care of the pairing correlation for the open shell nuclei. The contour plot of the nucleons distribution are analyzed at various parts of the nucleus, where clusters are located. The presence of an $^{16}$O core along bubble like $\\alpha$-particle(s) and few {\\it nucleons} are found in the Mg isotopes.

Bhuyan, M

2013-01-01T23:59:59.000Z

340

E-Print Network 3.0 - abundance isotopic Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Sample search results for: abundance isotopic Page: << < 1 2 3 4 5 > >> 1 ISOTOPE FRACTIONATION Isotopes are atoms whose nuclei contain the same number of protons but...

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

E-Print Network 3.0 - alpha-deuterium isotope effects Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

deuterium isotope effects Search Powered by Explorit Topic List Advanced Search Sample search results for: alpha-deuterium isotope effects Page: << < 1 2 3 4 5 > >> 1 ISOTOPE...

342

Strontium and carbon isotope stratigraphy of the Llandovery (Early Silurian): Implications for tectonics and weathering  

E-Print Network [OSTI]

Strontium and carbon isotope stratigraphy of the Llandovery (Early Silurian): Implications online 2 June 2010 Keywords: Silurian Strontium isotopes Carbon isotopes Weathering K-bentonites A high

Saltzman, Matthew R.

343

Isotope Program Facilities | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

include the High Flux Isotope Reactor at Oak Ridge National Laboratory and the Advanced Test Reactor at Idaho National Laboratory. The DOE Isotope Program also supports isotope...

344

Oxygen isotope fractionation in the vacuum ultraviolet photodissociation of carbon monoxide: Wavelength, pressure and temperature dependency.  

E-Print Network [OSTI]

Oxygen isotope fractionation in the vacuum ultravioletmeasurement of the associated oxygen isotopic composition ofwavelength dependency of the oxygen isotopic composition in

Chakraborty, Subrata

2013-01-01T23:59:59.000Z

345

E-Print Network 3.0 - applied isotope techniques Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sciences and Ecology ; Biology and Medicine 100 Electrochemical Isotope Effect and Lithium Isotope Separation Jay R. Black, Summary: that the magnitude of isotopic...

346

Final Report, NEAC Subcommittee for Isotope Research & Production Planning  

Broader source: Energy.gov (indexed) [DOE]

Final Report, NEAC Subcommittee for Isotope Research & Production Final Report, NEAC Subcommittee for Isotope Research & Production Planning Final Report, NEAC Subcommittee for Isotope Research & Production Planning Isotopes, including both radioactive and stable isotopes, make important contributions to research, medicine, and industry in the United States and throughout the world. For nearly fifty years, the Department of Energy (DOE) has actively promoted the use of isotopes by funding (a) production of isotopes at a number of national laboratories with unique nuclear reactors or particle accelerators, (b) nuclear medicine research at the laboratories and in academia, (c) research into industrial applications of isotopes, and (d) research into isotope production and processing methods. The radio- pharmaceutical and radiopharmacy industries have their origin in

347

UW Cosmogenic Isotopes Al-Be 1 EXTRACTION OF Al & Be FROM QUARTZ FOR ISOTOPIC ANALYSIS  

E-Print Network [OSTI]

UW Cosmogenic Isotopes Al-Be 1 EXTRACTION OF Al & Be FROM QUARTZ FOR ISOTOPIC ANALYSIS Summary This method is used to separate Al and Be for AMS analysis from pure quartz samples. After adding Be carrier, quartz is dissolved in HF. The solution is sub-sampled for determination of total Al content, then dried

Stone, John

348

TRIFID (TRansuranic Isotopic Fraction Interrogation Device): A second generation plutonium isotopic analysis system  

SciTech Connect (OSTI)

The TRIFID (Transuranic Isotopic Fraction Interrogation Device) system is a second generation plutonium isotopic analysis system which incorporates many new and unique features in the area of isotopic data acquisition and isotopic analysis instrument consisting of a Canberra Series 95-MCA interfaced to a Compaq 386 computer. The entire TRIFID software package, including MCA communications and isotopic analysis routines, was developed using the C programming language. Extensive use has been made of user friendly screens and menus for ease of operation and training and to facilitate use by technical level operators. Automated TRIFID features provide for MCA/ADC setup and acquisition, spectral storage, isotopic analysis, and report generation. One unique feature of the TRIFID system design allows it to be pre-programed for an entire day's counting. The isotopic analysis module (EPICS) contains an expert system formalism which is used to detect and assay for spectral interferences, and to automatically adjust peak fitting constraints based on spectral intensity variations. A TRIFID system has been in operation in a production laboratory at the Rocky Flats Plant since September 1988. Marked decreases in training and hands-on operation time have been achieved in comparison to the older, preceding isotopic systems. 2 refs., 3 figs.

Fleissner, J G; Coressel, T W; Freier, D A; Macklin, L L

1989-01-01T23:59:59.000Z

349

Isotope Effects on the Enzymatic and Nonenzymatic Reactions of Chorismate  

Science Journals Connector (OSTI)

The isotopic composition of the latter was determined by isotope ratio mass spectrometry, enabling determination of isotope effects at the mechanistically interesting key positions O7, C1, and C9. ... Heavy atom isotope effects on the nonenzymatic Claisen rearrangement to give prephenate, 18k1 and 13k1, were determined at 60 °C as described for the enzymatic reactions and calculated from the following relationship: where xk1 is the apparent isotope effect, expressed as a ratio of the rate constants for the light and heavy (x) isotopes. ...

S. Kirk Wright; Michael S. DeClue; Ajay Mandal; Lac Lee; Olaf Wiest; W. Wallace Cleland; Donald Hilvert

2005-08-27T23:59:59.000Z

350

Isotope Shift Measurements of Stable and Short-Lived Lithium Isotopes for Nuclear Charge Radii Determination  

E-Print Network [OSTI]

Changes in the mean-square nuclear charge radii along the lithium isotopic chain were determined using a combination of precise isotope shift measurements and theoretical atomic structure calculations. Nuclear charge radii of light elements are of high interest due to the appearance of the nuclear halo phenomenon in this region of the nuclear chart. During the past years we have developed a new laser spectroscopic approach to determine the charge radii of lithium isotopes which combines high sensitivity, speed, and accuracy to measure the extremely small field shift of an 8 ms lifetime isotope with production rates on the order of only 10,000 atoms/s. The method was applied to all bound isotopes of lithium including the two-neutron halo isotope Li-11 at the on-line isotope separators at GSI, Darmstadt, Germany and at TRIUMF, Vancouver, Canada. We describe the laser spectroscopic method in detail, present updated and improved values from theory and experiment, and discuss the results.

W. Nörtershäuser; R. Sánchez; G. Ewald; A. Dax; J. Behr; P. Bricault; B. A. Bushaw; J. Dilling; M. Dombsky; G. W. F. Drake; S. Götte; H. -J. Kluge; Th. Kühl; J. Lassen; C. D. P. Levy; K. Pachucki; M. Pearson; M. Puchalski; A. Wojtaszek; Z. -C. Yan; C. Zimmermann

2010-09-02T23:59:59.000Z

351

REPORT OF SURVEY OF OAK RIDGE ISOTOPE  

Broader source: Energy.gov (indexed) [DOE]

OAK RIDGE ISOTOPE OAK RIDGE ISOTOPE ENRICHMENT (CALUTRON) FACILITY BUILDING 9204-3 U.S. Department of Energy Office of Environmental Management & Office of Nuclear Energy Report of Survey of Oak Ridge Isotope Enrichment (Calutron) Facility Building 9204-3 FINAL May 8, 2000 Contents 1. Introduction 1.1 Purpose 1.2 Facility Description 1.3 Organization Representatives 1.4 Survey Participants 2. Summary, Conclusions & Recommendations 2.1 Transfer Considerations 2.2 Post-Transfer EM Path Forward & Management Risk 3. Survey Results 4. Stabilization and Other Actions Required for Transfer 5. Surveillance & Maintenance After Transfer 6. Other Transfer Details 7. Attachments and References Appendix A - Detailed Survey Notes

352

Isotopic substitution in a model polaronic system  

Science Journals Connector (OSTI)

The effect of isotopic substitution in the excitation spectrum of a model polaronic system is presented. To study this effect we use a three-site many-body Hamiltonian, with two phonon modes, which includes electronic correlations and electron-phonon interactions. Under isotopic substitution, the shift of the lowest excitation energy changes sign for intermediate electron-phonon coupling, coinciding with the onset of polaronic behavior. This manifests as a strong change of the dynamics of polaron tunneling, a behavior opposite to that found in purely phonon excitations. Additionally, a small change in the static polaronic distortion appears under isotopic substitution. This change in the local structure has opposite signs for low and intermediate electron-phonon coupling compared to that found in the strong-coupling limit.

J. Mustre de Leon; R. de Coss; A. R. Bishop; S. A. Trugman

1999-04-01T23:59:59.000Z

353

Apparatus for separating and recovering hydrogen isotopes  

DOE Patents [OSTI]

An apparatus for recovering hydrogen and separating its isotopes. The apparatus includes a housing bearing at least a fluid inlet and a fluid outlet. A baffle is disposed within the housing, attached thereto by a bracket. A hollow conduit is coiled about the baffle, in spaced relation to the baffle and the housing. The coiled conduit is at least partially filled with a hydride. The hydride can be heated to a high temperature and cooled to a low temperature quickly by circulating a heat transfer fluid in the housing. The spacing between the baffle and the housing maximizes the heat exchange rate between the fluid in the housing and the hydride in the conduit. The apparatus can be used to recover hydrogen isotopes (protium, deuterium and tritium) from gaseous mixtures, or to separate hydrogen isotopes from each other.

Heung, Leung K. (Aiken, SC)

1994-01-01T23:59:59.000Z

354

Atomic line emission analyzer for hydrogen isotopes  

DOE Patents [OSTI]

Apparatus for isotopic analysis of hydrogen comprises a low pressure chamber into which a sample of hydrogen is introduced and then exposed to an electrical discharge to excite the electrons of the hydrogen atoms to higher energy states and thereby cause the emission of light on the return to lower energy states, a Fresnel prism made at least in part of a material anomalously dispersive to the wavelengths of interest for dispersing the emitted light, and a photodiode array for receiving the dispersed light. The light emitted by the sample is filtered to pass only the desired wavelengths, such as one of the lines of the Balmer series for hydrogen, the wavelengths of which differ slightly from one isotope to another. The output of the photodiode array is processed to determine the relative amounts of each isotope present in the sample. Additionally, the sample itself may be recovered using a metal hydride.

Kronberg, James W. (108 Independent Blvd., Aiken, SC 29801)

1993-01-01T23:59:59.000Z

355

Atomic line emission analyzer for hydrogen isotopes  

DOE Patents [OSTI]

Apparatus for isotopic analysis of hydrogen comprises a low pressure chamber into which a sample of hydrogen is introduced and then exposed to an electrical discharge to excite the electrons of the hydrogen atoms to higher energy states and thereby cause the emission of light on the return to lower energy states, a Fresnel prism made at least in part of a material anomalously dispersive to the wavelengths of interest for dispersing the emitted light, and a photodiode array for receiving the dispersed light. The light emitted by the sample is filtered to pass only the desired wavelengths, such as one of the lines of the Balmer series for hydrogen, the wavelengths of which differ slightly from one isotope to another. The output of the photodiode array is processed to determine the relative amounts of each isotope present in the sample. Additionally, the sample itself may be recovered using, a metal hydride.

Kronberg, J.W.

1991-05-08T23:59:59.000Z

356

Atomic line emission analyzer for hydrogen isotopes  

DOE Patents [OSTI]

Apparatus for isotopic analysis of hydrogen comprises a low pressure chamber into which a sample of hydrogen is introduced and then exposed to an electrical discharge to excite the electrons of the hydrogen atoms to higher energy states and thereby cause the emission of light on the return to lower energy states, a Fresnel prism made at least in part of a material anomalously dispersive to the wavelengths of interest for dispersing the emitted light, and a photodiode array for receiving the dispersed light. The light emitted by the sample is filtered to pass only the desired wavelengths, such as one of the lines of the Balmer series for hydrogen, the wavelengths of which differ slightly from one isotope to another. The output of the photodiode array is processed to determine the relative amounts of each isotope present in the sample. Additionally, the sample itself may be recovered using a metal hydride.

Kronberg, J.W.

1993-03-30T23:59:59.000Z

357

Report of Survey of Oak Ridge Isotope Enrichment (Calutron) Facility...  

Office of Environmental Management (EM)

Report of Survey of Oak Ridge Isotope Enrichment (Calutron) Facility Building 9204-3 Report of Survey of Oak Ridge Isotope Enrichment (Calutron) Facility Building 9204-3 The...

358

Isotope effects in methanol synthesis and the reactivity of copper...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Isotope effects in methanol synthesis and the reactivity of copper formates on a CuSiO2 catalyst. Isotope effects in methanol synthesis and the reactivity of copper formates on a...

359

A Helium Isotope Perspective On The Dixie Valley, Nevada, Hydrothermal...  

Open Energy Info (EERE)

gas abundances and isotopic compositions. The helium isotopic compositions of fluids produced from the Dixie Valley geothermal field range from 0.70 to 0.76 Ra, are among the...

360

Hydrogen isotope fractionation during lipid biosynthesis by Haloarcula marismortui  

E-Print Network [OSTI]

Hydrogen isotope fractionation during lipid biosynthesis by Haloarcula marismortui Sitindra S studied the controls on the fractionation of hydrogen isotopes during lipid biosynthesis by Haloarcula marismortui, a halophilic archaea, in pure culture experiments by varying organic substrate, the hydrogen

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Uranium-238 and thorium-232 series concentrations in soil, radon-222 indoor and drinking water concentrations and dose assessment in the city of Aldama, Chihuahua, Mexico  

Science Journals Connector (OSTI)

High-resolution gamma spectrometry was used to determine the concentration of 40K, 238U and 232Th series in soil samples taken from areas surrounding the city of Aldama, in Chihuahua. Results of indoor air short-time sampling, with diffusion barrier charcoal detectors, revealed relatively high indoor radon levels, ranging from 29 to 422 Bq/m3; the radon concentrations detected exceeded 148 Bq/m3 in 76% of the homes tested. Additionally, liquid scintillation counting showed concentrations of radon in drinking water ranging from 4.3 to 42 kBq/m3. The high activity of 238U in soil found in some places may be a result of the uranium milling process performed 20 years ago in the area. High radon concentrations indoor and in water may be explained by assuming the presence of uranium-bearing rocks underneath of the city, similar to a felsic dike located near Aldama. The estimated annual effective dose of gamma radiation from the soil and radon inhalation was 3.83 mSv.

L. Colmenero Sujo; M.E. Montero Cabrera; L. Villalba; M. Rentería Villalobos; E. Torres Moye; M. García León; R. García-Tenorio; F. Mireles García; E.F. Herrera Peraza; D. Sánchez Aroche

2004-01-01T23:59:59.000Z

362

CARBONATE STABLE ISOTOPES | Terrestrial Teeth and Bones  

Science Journals Connector (OSTI)

Teeth and bones of fossil vertebrates can preserve a record of Quaternary terrestrial environments in the form of isotopic compositions of carbon (13C/12C), nitrogen (15N/14N), and oxygen (18O/16O). These isotopic signatures in teeth and bones have yielded valuable information on the extent of savanna environments under tropical climates, on the ancient levels of aridity, on the spread of dense forests at the beginning of the Holocene, and on the paleodiet of hominids and their associated fauna.

H. Bocherens; D.G. Drucker

2007-01-01T23:59:59.000Z

363

CARBONATE STABLE ISOTOPES | Terrestrial Teeth and Bones  

Science Journals Connector (OSTI)

Abstract Teeth and bones of fossil vertebrates can preserve a record of Quaternary terrestrial environments in the form of the isotopic compositions of carbon (13C/12C), nitrogen (15N/14N), and oxygen (18O/16O). These isotopic signatures in teeth and bones have yielded valuable information on the extent of savanna environments under tropical climates, on the ancient levels of aridity, on the spread of dense forests at the beginning of the Holocene, and on the paleodiet of Hominids and their associated fauna.

H. Bocherens; D.G. Drucker

2013-01-01T23:59:59.000Z

364

Isotopic abundance in atom trap trace analysis  

DOE Patents [OSTI]

A method and system for detecting ratios and amounts of isotopes of noble gases. The method and system is constructed to be able to measure noble gas isotopes in water and ice, which helps reveal the geological age of the samples and understand their movements. The method and system uses a combination of a cooled discharge source, a beam collimator, a beam slower and magneto-optic trap with a laser to apply resonance frequency energy to the noble gas to be quenched and detected.

Lu, Zheng-Tian; Hu, Shiu-Ming; Jiang, Wei; Mueller, Peter

2014-03-18T23:59:59.000Z

365

Equilibrium Isotope Effect for Hydrogen Absorption in Palladium  

Science Journals Connector (OSTI)

The method using addition of isotopes to the system in sequence to investigate isotope exchange effects has not been previously reported. ... (1) A simple model was proposed(1) that described the dependence of the desorption plateau pressure on a linear combination of the isotopic fractions in the solid and the plateau pressures of the single-isotope?Pd systems; that is, H?Pd and D?Pd. ...

Weifang Luo; Donald F. Cowgill; Rion A. Causey

2009-10-21T23:59:59.000Z

366

Isotopic Enrichment of Tritiated Water by a Bipolar Electrolysis Process  

Science Journals Connector (OSTI)

Isotope Separation / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001

S. Heinze; D. Ducret; J.-P. Verdin; T. Pelletier

367

Isotopic Analysis- Gas At Dixie Valley Geothermal Area (Kennedy...  

Open Energy Info (EERE)

search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Gas At Dixie Valley Geothermal Area (Kennedy & Soest, 2006) Exploration Activity Details...

368

Final Report on Isotope Ratio Techniques for Light Water Reactors  

SciTech Connect (OSTI)

The Isotope Ratio Method (IRM) is a technique for estimating the energy or plutonium production in a fission reactor by measuring isotope ratios in non-fuel reactor components. The isotope ratios in these components can then be directly related to the cumulative energy production with standard reactor modeling methods.

Gerlach, David C.; Gesh, Christopher J.; Hurley, David E.; Mitchell, Mark R.; Meriwether, George H.; Reid, Bruce D.

2009-07-01T23:59:59.000Z

369

Isotope Fractionation of Water during Evaporation without Condensation  

Science Journals Connector (OSTI)

Specifially, isotope fractionation factors associated with free evaporation (?evap) have been measured as a function of the isotopic composition and temperature of the liquid. ... Liquid-vapor fractionation of oxygen and hydrogen isotopes of water from the freezing to the critical temperature ...

Christopher D. Cappa; Walter S. Drisdell; Jared D. Smith; Richard J. Saykally; Ronald C. Cohen

2005-12-03T23:59:59.000Z

370

Discovery of Rubidium, Strontium, Molybdenum, and Rhodium Isotopes  

E-Print Network [OSTI]

Currently, thirty-one rubidium, thirty-five strontium, thirty-five molybdenum and thirty-eight rhodium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

Parker, A M

2011-01-01T23:59:59.000Z

371

Discovery of rubidium, strontium, molybdenum, and rhodium isotopes  

SciTech Connect (OSTI)

Currently, 31 rubidium, 35 strontium, 35 molybdenum, and 38 rhodium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

Parker, A.M.; Thoennessen, M., E-mail: thoennessen@nscl.msu.edu

2012-07-15T23:59:59.000Z

372

Discovery of Rubidium, Strontium, Molybdenum, and Rhodium Isotopes  

E-Print Network [OSTI]

Currently, thirty-one rubidium, thirty-five strontium, thirty-five molybdenum and thirty-eight rhodium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

A. M. Parker; M. Thoennessen

2011-02-11T23:59:59.000Z

373

Hydrogen isotope fractionation during lipid biosynthesis by Tetrahymena thermophila  

E-Print Network [OSTI]

Hydrogen isotope fractionation during lipid biosynthesis by Tetrahymena thermophila Sitindra S Accepted 7 September 2013 Available online 16 September 2013 a b s t r a c t Hydrogen isotope ratio values from recording the hydrogen isotope composition of ambient water, dD values of lipids also depend

374

Isotope Explorer Users Manual S.Y.F. Chu*  

E-Print Network [OSTI]

Transfer B. Data from Local Disk or the Table of Isotopes CD-ROM C. Isotope Explorer as Helper Application disk (e.g. from the Table of Isotopes CD-ROM). The ENSDF database on the 1999 update CD-ROM

375

Discovery of Cesium, Lanthanum, Praseodymium and Promethium Isotopes  

E-Print Network [OSTI]

Currently, forty-one cesium, thirty-five lanthanum, thirty-two praseodymium, and thirty-one promethium, isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

May, E

2011-01-01T23:59:59.000Z

376

Discovery of Cesium, Lanthanum, Praseodymium and Promethium Isotopes  

E-Print Network [OSTI]

Currently, forty-one cesium, thirty-five lanthanum, thirty-two praseodymium, and thirty-one promethium, isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

E. May; M. Thoennessen

2011-09-08T23:59:59.000Z

377

Analysis of Gamma Radiation from a Radon Source: Indications of a Solar Influence  

E-Print Network [OSTI]

This article presents an analysis of about 29,000 measurements of gamma radiation associated with the decay of radon in a sealed container at the Geological Survey of Israel (GSI) Laboratory in Jerusalem between 28 January 2007 and 10 May 2010. These measurements exhibit strong variations in time of year and time of day, which may be due in part to environmental influences. However, time-series analysis reveals a number of periodicities, including two at approximately 11.2 year$^{-1}$ and 12.5 year$^{-1}$. We have previously found these oscillations in nuclear-decay data acquired at the Brookhaven National Laboratory (BNL) and at the Physikalisch-Technische Bundesanstalt (PTB), and we have suggested that these oscillations are attributable to some form of solar radiation that has its origin in the deep solar interior. A curious property of the GSI data is that the annual oscillation is much stronger in daytime data than in nighttime data, but the opposite is true for all other oscillations. This may be a systematic effect but, if it is not, this property should help narrow the theoretical options for the mechanism responsible for decay-rate variability.

Peter A. Sturrock; Gideon Steinitz; Ephraim Fischbach; Daniel Javorsek, II; Jere H. Jenkins

2012-05-01T23:59:59.000Z

378

An investigation of radon release and mobility in the subsurface environment. Final project report  

SciTech Connect (OSTI)

Processes affecting transport of volatile species in the shallow soil column have recently been recognized as having a substantial impact on a broad array of real world problems. Investigations of volatile transport have ranged from studies of probable health impacts of radon infiltration into homes to pesticide and volatile organic contaminant mobility in the soil column. The objectives of many of these studies has been the development of numerical models of vapor phase (and solute) transport in shallow soils. An early model, LEACHM, developed by Hutson and Wagenent was recently modified enabling it to describe both solute and vapor phase transport of volatile chemicals in the soil. Subsequent tests of the latter model, named LEACHV, showed that use outside of a very restricted range of soil conditions resulted in large mass balance errors and unreasonable values for soil gas concentrations and vapor flux. The present research was undertaken in an effort to identify and correct the subroutines responsible for the problems and to allow the model to describe vapor phase transport in a much broader range of soil conditions.

Thomas, D.

1997-06-01T23:59:59.000Z

379

Laser Isotope Enrichment for Medical and Industrial Applications  

SciTech Connect (OSTI)

Laser Isotope Enrichment for Medical and Industrial Applications by Jeff Eerkens (University of Missouri), Jay Kunze (Idaho State University), and Leonard Bond (Idaho National Laboratory) The principal isotope enrichment business in the world is the enrichment of uranium for commercial power reactor fuels. However, there are a number of other needs for separated isotopes. Some examples are: 1) Pure isotopic targets for irradiation to produce medical radioisotopes. 2) Pure isotopes for semiconductors. 3) Low neutron capture isotopes for various uses in nuclear reactors. 4) Isotopes for industrial tracer/identification applications. Examples of interest to medicine are targets to produce radio-isotopes such as S-33, Mo-98, Mo-100, W-186, Sn-112; while for MRI diagnostics, the non-radioactive Xe-129 isotope is wanted. For super-semiconductor applications some desired industrial isotopes are Si-28, Ga-69, Ge-74, Se-80, Te-128, etc. An example of a low cross section isotope for use in reactors is Zn-68 as a corrosion inhibitor material in nuclear reactor primary systems. Neutron activation of Ar isotopes is of interest in industrial tracer and diagnostic applications (e.g. oil-logging). . In the past few years there has been a sufficient supply of isotopes in common demand, because of huge Russian stockpiles produced with old electromagnetic and centrifuge separators previously used for uranium enrichment. Production of specialized isotopes in the USA has been largely accomplished using old ”calutrons” (electromagnetic separators) at Oak Ridge National Laboratory. These methods of separating isotopes are rather energy inefficient. Use of lasers for isotope separation has been considered for many decades. None of the proposed methods have attained sufficient proof of principal status to be economically attractive to pursue commercially. Some of the authors have succeeded in separating sulfur isotopes using a rather new and different method, known as condensation repression. In this scheme a gas, of the selected isotopes for enrichment, is irradiated with a laser at a particular wavelength that would excite only one of the isotopes. The entire gas is subject to low temperatures sufficient to cause condensation on a cold surface. Those molecules in the gas that the laser excited are not as likely to condense as are the unexcited molecules. Hence the gas drawn out of the system will be enriched in the isotope that was excited by the laser. We have evaluated the relative energy required in this process if applied on a commercial scale. We estimate the energy required for laser isotope enrichment is about 20% of that required in centrifuge separations, and 2% of that required by use of "calutrons".

Leonard Bond

2006-07-01T23:59:59.000Z

380

It's Elemental - Isotopes of the Element Nitrogen  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Carbon Carbon Previous Element (Carbon) The Periodic Table of Elements Next Element (Oxygen) Oxygen Isotopes of the Element Nitrogen [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 14 99.636% STABLE 15 0.364% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 10 No Data Available Proton Emission 100.00% 11 5.49×10-22 seconds Proton Emission 100.00% 12 11.000 milliseconds Electron Capture 100.00% 13 9.965 minutes Electron Capture 100.00% 14 STABLE - - 15 STABLE - - 16 7.13 seconds Beta-minus Decay 100.00% Beta-minus Decay with delayed Alpha Decay 1.2×10-3 % 17 4.173 seconds Beta-minus Decay 100.00%

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Radioactive isotopes in Danish drinking water  

E-Print Network [OSTI]

Radioactive isotopes in Danish drinking water Sven P. Nielsen Risø National Laboratory Working OF INVESTIGATION 11 3 DESCRIPTION OF INVESTIGATION 12 4 RADIOACTIVITY IN DRINKING WATER 13 5 SAMPLING 15 6 27 #12;4 #12;5 Preface This project for investigation of radioactivity in drinking water shall

382

INTRODUCTION The oxygen isotopic compositions of minerals  

E-Print Network [OSTI]

- perature and aridity is not so well understood. Because the middle Holocene was a period of elevated solar of the Gulf of Mexico, Pacific, andArctic air masses (Bryson, 1966; Fig. 1). Gulf of Mexico air sup- plies of Mexico air masses and its precipitation is isotopically more negative than gulf moisture (e.g., typically

González, Luis A.

383

Review of hydrogen isotope permeability through materials  

SciTech Connect (OSTI)

This report is the first part of a comprehensive summary of the literature on hydrogen isotope permeability through materials that do not readily form hydrides. While we mainly focus on pure metals with low permeabilities because of their importance to tritium containment, we also give data on higher-permeability materials such as iron, nickel, steels, and glasses.

Steward, S.A.

1983-08-15T23:59:59.000Z

384

Mikhail Avilov Facility for Rare Isotope Beams  

E-Print Network [OSTI]

Challenges Chemical Challenges Radiation Challenges Summary #12; World-leading heavy ion accelerator facility for rare isotope science · Nuclear Structure · Nuclear Astrophysics · Fundamental Interactions Target vacuum vessel M. Avilov, May 2014 5th HP Targetry Workshop, FNAL, Slide 4 Target Beam dump Beam

McDonald, Kirk

385

Carbon IsotopesCarbon Isotopes A Short Course VU March, 2009  

E-Print Network [OSTI]

. Historical CO2 record from the Vostok ice core. In Trends: A Compendium of Data on Global Change. Carbon · Bitumen · Coal Range of Carbon Isotopes PDB Hoefs 1982 #12;2/25/2009 3 Range of Carbon Isotopes PDB Hoefs 1982 12CO2 Photosynthesis 12CO2 Respiration 13CO2 CO2+ RUBP = PGA (=27) RUBISCO #12;2/25/2009 4

Miami, University of

386

Method of enhancing selective isotope desorption from metals  

DOE Patents [OSTI]

A method of enhancing the thermal desorption of a first isotope of a diatomic gas from a metal comprises the steps of (a) establishing a partial pressure of a second isotope of the diatomic gas in vicinity of the metal; heating the metal to a temperature such that the first isotope is desorbed from the metal; and reducing the partial pressure of the desorbed first isotope while maintaining the partial pressure of the second isotope substantially constant. The method is especially useful for enhancing the desorption of tritium from the Zr-Al getter in a plasma confinement device.

Knize, Randall J. (Plainsboro, NJ); Cecchi, Joseph L. (Lawrenceville, NJ)

1984-01-01T23:59:59.000Z

387

Isotopic Analysis At Dixie Valley Geothermal Field Area (Laney, 2005) |  

Open Energy Info (EERE)

Isotopic Analysis At Dixie Valley Geothermal Field Area (Laney, 2005) Isotopic Analysis At Dixie Valley Geothermal Field Area (Laney, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Dixie Valley Geothermal Field Area (Laney, 2005) Exploration Activity Details Location Dixie Valley Geothermal Field Area Exploration Technique Isotopic Analysis- Fluid Activity Date Usefulness not indicated DOE-funding Unknown Notes Gas and Isotopes Geochemistry, Kennedy, van Soest and Shevenell. During FY04, we concentrated on two primary projects. The first was a detailed study of helium isotope systematics throughout Dixie Valley and the inter-relationship between the Dixie Valley geothermal reservoir and local hydrology. The second is the construction of a helium isotope "map" of the

388

Method of preparing mercury with an arbitrary isotopic distribution  

DOE Patents [OSTI]

This invention provides for a process for preparing mercury with a predetermined, arbitrary, isotopic distribution. In one embodiment, different isotopic types of Hg[sub 2]Cl[sub 2], corresponding to the predetermined isotopic distribution of Hg desired, are placed in an electrolyte solution of HCl and H[sub 2]O. The resulting mercurous ions are then electrolytically plated onto a cathode wire producing mercury containing the predetermined isotopic distribution. In a similar fashion, Hg with a predetermined isotopic distribution is obtained from different isotopic types of HgO. In this embodiment, the HgO is dissolved in an electrolytic solution of glacial acetic acid and H[sub 2]O. The isotopic specific Hg is then electrolytically plated onto a cathode and then recovered. 1 fig.

Grossman, M.W.; George, W.A.

1986-12-16T23:59:59.000Z

389

Method of preparing mercury with an arbitrary isotopic distribution  

DOE Patents [OSTI]

This invention provides for a process for preparing mercury with a predetermined, arbitrary, isotopic distribution. In one embodiment, different isotopic types of Hg.sub.2 Cl.sub.2, corresponding to the predetermined isotopic distribution of Hg desired, are placed in an electrolyte solution of HCl and H.sub.2 O. The resulting mercurous ions are then electrolytically plated onto a cathode wire producing mercury containing the predetermined isotopic distribution. In a similar fashion, Hg with a predetermined isotopic distribution is obtained from different isotopic types of HgO. In this embodiment, the HgO is dissolved in an electrolytic solution of glacial acetic acid and H.sub.2 O. The isotopic specific Hg is then electrolytically plated onto a cathode and then recovered.

Grossman, Mark W. (Belmont, MA); George, William A. (Rockport, MA)

1986-01-01T23:59:59.000Z

390

Isotope selective near-resonant two-photon ionization of 41Ca isotope via the 4s11s 1S0 intermediate state  

Science Journals Connector (OSTI)

Isotope selective excitation of a 41Ca isotope using a near-resonant two-photon ionization scheme 4s2 1S0-->422.7924...

Sankari, M

2008-01-01T23:59:59.000Z

391

Diffusion of Kr Isotopes in Solid Ar  

Science Journals Connector (OSTI)

The diffusion coefficient D=D0e-Q0RT and isotope effect for Kr78 and Kr86 in solid Ar have been measured using a tracer technique. The activation energy QKr0 depends on the interchange parameter w, but is estimated to lie in the range 3500-3900 cal mole-1, with the most reliable w giving the lower value. Thus, the two calculated QKr0 (3853 and 4050 cal mole-1) for the vacancy mechanism using a two-body (12, 6) potential appear somewhat high, but in reasonable agreement with experiment. The isotope effect gives f?K?(D78D86-1)[(8678)12-1]=0.48±0.25 which, since QKr0?QAr0, suggests that ?K?0.6 for a single-vacancy mechanism. {Here f is the correlation factor and ?K?(?278?286-1)[(8678)12-1], where ?2 is the tracer jump rate.}

E. H. C. PARKER; B. L. SMITH; H. R. GLYDE

1969-12-15T23:59:59.000Z

392

Nuclear sizes and the isotope shift  

Science Journals Connector (OSTI)

Darwin-Foldy nuclear-size corrections in electronic atoms and nuclear radii are discussed from the nuclear-physics perspective. The interpretation of precise isotope-shift measurements is formalism dependent, and care must be exercised in interpreting these results and those obtained from relativistic electron scattering from nuclei. We strongly advocate that the entire nuclear-charge operator be used in calculating nuclear-size corrections in atoms rather than relegating portions of it to the nonradiative recoil corrections. A preliminary examination of the intrinsic deuteron radius obtained from isotope-shift measurements suggests the presence of small meson-exchange currents (exotic binding contributions of relativistic order) in the nuclear charge operator, which contribute approximately 12%.

J. L. Friar; J. Martorell; D. W. L. Sprung

1997-12-01T23:59:59.000Z

393

High-purity, isotopically enriched bulk silicon  

SciTech Connect (OSTI)

The synthesis and characterization of dislocation-free, undoped, single crystals of Si enriched in all 3 stable isotopes is reported: {sup 28}Si (99.92%), {sup 29}Si (91.37%), and {sup 30}Si (89.8%). A silane-based process compatible with the relatively small amounts of isotopically enriched precursors that are practically available was used. The silane is decomposed to silicon on a graphite starter rod heated to 700-750 C in a recirculating flow reactor. A typical run produces 35 gm of polycrystalline Si at a growth rates of 5 {micro}m/min and conversion efficiency >95%. Single crystals are grown by the floating zone method and characterized by electrical and optical measurements. Concentrations of shallow dopants (P and B) are as low as mid-10{sup 13} cm{sup -3}. Concentrations of C and O lie below 10{sup 16} and 10{sup 15} cm{sup -3}, respectively.

Ager III, J.W.; Beeman, J.W.; Hansen, W.L.; Haller, E.E.; Sharp, I.D.; Liao, C.; Yang, A.; Thewalt, M.L.W.; Riemann, H.

2004-11-17T23:59:59.000Z

394

Anomalous isotopic composition of cosmic rays  

SciTech Connect (OSTI)

Recent measurements of nonsolar isotopic patterns for the elements neon and (perhaps) magnesium in cosmic rays are interpreted within current models of stellar nucleosynthesis. One possible explanation is that the stars currently responsible for cosmic-ray synthesis in the Galaxy are typically super-metal-rich by a factor of two to three. Other possibilities include the selective acceleration of certain zones or masses of supernovas or the enhancement of /sup 22/Ne in the interstellar medium by mass loss from red giant stars and planetary nebulas. Measurements of critical isotopic ratios are suggested to aid in distinguishing among the various possibilities. Some of these explanations place significant constraints on the fraction of cosmic ray nuclei that must be fresh supernova debris and the masses of the supernovas involved. 1 figure, 3 tables.

Woosley, S.E.; Weaver, T.A.

1980-06-20T23:59:59.000Z

395

Diffusional exchange of isotopes in a metal hydride sphere.  

SciTech Connect (OSTI)

This report describes the Spherical Particle Exchange Model (SPEM), which simulates exchange of one hydrogen isotope by another hydrogen isotope in a spherical metal hydride particle. This is one of the fundamental physical processes during isotope exchange in a bed of spherical metal particles and is thus one of the key components in any comprehensive physics-based model of exchange. There are two important physical processes in the model. One is the entropy of mixing between the two isotopes; the entropy of mixing is increased by having both isotopes randomly placed at interstitial sites on the lattice and thus impedes the exchange process. The other physical process is the elastic interaction between isotope atoms on the lattice. The elastic interaction is the cause for {beta}-phase formation and is independent of the isotope species. In this report the coupled diffusion equations for two isotopes in the {beta}-phase hydride are solved. A key concept is that the diffusion of one isotope depends not only on its concentration gradient, but also on the concentration gradient of the other isotope. Diffusion rate constants and the chemical potentials for deuterium and hydrogen in the {beta}-phase hydride are reviewed because these quantities are essential for an accurate model of the diffusion process. Finally, a summary of some of the predictions from the SPEM model are provided.

Wolfer, Wilhelm G.; Hamilton, John C.; James, Scott Carlton

2011-04-01T23:59:59.000Z

396

Isotopic noble gas signatures released from medical isotope production facilities - Simulations and measurements  

SciTech Connect (OSTI)

Journal article on the role that radioxenon isotopes play in confirming whether or not an underground explosion was nuclear in nature. Radioxenon isotopes play a major role in confirming whether or not an underground explosion was nuclear in nature. It is then of key importance to understand the sources of environmental radioxenon to be able to distinguish civil sources from those of a nuclear explosion. Based on several years of measurements, combined with advanced atmospheric transport model results, it was recently shown that the main source of radioxenon observations are strong and regular batch releases from a very limited number of medical isotope production facilities. This paper reviews production processes in different medical isotope facilities during which radioxenon is produced. Radioxenon activity concentrations and isotopic compositions are calculated for six large facilities. The results are compared with calculated signals from nuclear explosions. Further, the outcome is compared and found to be consistent with radioxenon measurements recently performed in and around three of these facilities. Some anomalies in measurements in which {sup 131m}Xe was detected were found and a possible explanation is proposed. It was also calculated that the dose rate of the releases is well below regulatory values. Based on these results, it should be possible to better understand, interpret and verify signals measured in the noble gas measurement systems in the International Monitoring of the Comprehensive Nuclear-Test-Ban Treaty.

Saey, Paul R.; Bowyer, Ted W.; Ringbom, Anders

2010-09-09T23:59:59.000Z

397

High Flux Isotope Reactor power upgrade status  

SciTech Connect (OSTI)

A return to 100-MW operation is being planned for the High Flux Isotope Reactor (HFIR). Recent improvements in fuel element manufacturing procedures and inspection equipment will be exploited to reduce hot spot and hot streak factors sufficiently to permit the power upgrade without an increase in primary coolant pressure. Fresh fuel elements already fabricated for future use are being evaluated individually for power upgrade potential based on their measured coolant channel dimensions.

Rothrock, R.B.; Hale, R.E. [Oak Ridge National Lab., TN (United States); Cheverton, R.D. [Delta-21 Resources Inc., Oak Ridge, TN (United States)

1997-03-01T23:59:59.000Z

398

Sulfur-isotope separation by distillation  

SciTech Connect (OSTI)

Sulfur-isotope separation by low-temperature distillation of hydrogen sulfide was studied in an 8-m, 25-mm diameter distillation column. Column temperature was controlled by a propane-propylene heat pipe. Column packing HETP was measured using nitric oxide in the column. The column was operated at pressures from 45 to 125 kPa. The relative volatility of S-32 vs. S-34 varied from 1.0008 to 1.0014.

Mills, T.R.

1982-01-01T23:59:59.000Z

399

Concerning the Facility for Rare Isotope Beams  

ScienceCinema (OSTI)

James Symons, Nuclear Science Division Director at Lawrence Berkeley Lab, and Daniela Leitner, head of operations at Berkeley Lab's 88-Inch Cyclotron, discuss major contributions to the new Facility for Rare Isotope Beams (FRIB) at Michigan State University, including ion source, which will based on the VENUS source built for the 88-Inch Cyclotron, and the GRETA gamma-ray detector now under construction there.

Symons, James

2013-05-29T23:59:59.000Z

400

Computer program for the sensitivity calculation of a CR-39 detector in a diffusion chamber for radon measurements  

SciTech Connect (OSTI)

Computer software for calculation of the sensitivity of a CR-39 detector closed in a diffusion chamber to radon is described in this work. The software consists of two programs, both written in the standard Fortran 90 programming language. The physical background and a numerical example are given. Presented software is intended for numerous researches in radon measurement community. Previously published computer programs TRACK-TEST.F90 and TRACK-VISION.F90 [D. Nikezic and K. N. Yu, Comput. Phys. Commun. 174, 160 (2006); D. Nikezic and K. N. Yu, Comput. Phys. Commun. 178, 591 (2008)] are used here as subroutines to calculate the track parameters and to determine whether the track is visible or not, based on the incident angle, impact energy, etching conditions, gray level, and visibility criterion. The results obtained by the software, using five different V functions, were compared with the experimental data found in the literature. Application of two functions in this software reproduced experimental data very well, while other three gave lower sensitivity than experiment.

Nikezic, D., E-mail: nikezic@kg.ac.rs; Stajic, J. M. [Faculty of Science, University of Kragujevac, R. Domanovica 12, Kragujevac 34000 (Serbia)] [Faculty of Science, University of Kragujevac, R. Domanovica 12, Kragujevac 34000 (Serbia); Yu, K. N. [Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue (Hong Kong)] [Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue (Hong Kong)

2014-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Rogers, V.C., K.K. Nielson, 1991, "Multiphase Radon Generation and Transport in Porous Minerals," Health Physics Vol. 60, No. 6, 807-813.  

E-Print Network [OSTI]

Radioactivity (TENR) Cause by Non-Uranium Mining, October 16-19, Szczyrk, Poland. Usman, S.S., H.Spitz, and J Limited presented at the Nuclear Regulatory Commission Uranium Recovery Licensing Workshop, January 11 to Monitor Radon Emissions from Uranium Tailings," Contract Number EP-D-05-002, Work Assignment No. 4

402

Estimation of dose contribution from 226Ra, 232Th and 40K radon exhalation rates in soil samples from Shivalik foot hills in India  

Science Journals Connector (OSTI)

......than the limit (370 Bq kg1) set in the 1979 Organization for Economic Co-operation and Development report. The calculated values...of radon exhalation rate and estimation of radiation doses in coal and fly ash samples. Appl. Radiat. Isot. (2008) 66:401-406......

R. P. Chauhan; Pooja Chauhan; Anil Pundir; Sunil Kamboj; Vakul Bansal; R. S. Saini

2014-01-01T23:59:59.000Z

403

Magnesium isotopic systematics of chondrules and CAIs from Allende, Murchison, Murray and Bjurbole. F.-, M. Wadhwa1,  

E-Print Network [OSTI]

Magnesium isotopic systematics of chondrules and CAIs from Allende, Murchison, Murray and Bjurbole: Magnesium isotopic analyses were performed at the Isotope Geochemistry Labora- tory of the Field Museum

Grossman, Lawrence

404

Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) | Open  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) Exploration Activity Details Location Sierra Valley Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References Whelan, J. A. (1 September 1990) Water geochemistry study of

405

Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area (1990) Exploration Activity Details Location Indian Valley Hot Springs Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References

406

CRAD, Management- Oak Ridge National Laboratory High Flux Isotope Reactor |  

Broader source: Energy.gov (indexed) [DOE]

Management- Oak Ridge National Laboratory High Flux Isotope Management- Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Management- Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Management in preparation for restart of the Oak Ridge National Laboratory High Flux Isotope Reactor. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Management- Oak Ridge National Laboratory High Flux Isotope Reactor More Documents & Publications CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux Isotope

407

CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor  

Broader source: Energy.gov (indexed) [DOE]

Engineering - Oak Ridge National Laboratory High Flux Isotope Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Engineering Program in preparation for restart of the Oak Ridge National Laboratory High Flux Isotope Reactor. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor More Documents & Publications CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor

408

Isotope Development & Production for Research and Applications (IDPRA) |  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Research » Isotope Research » Isotope Development & Production for Research and Applications (IDPRA) Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Funding Opportunities Nuclear Science Advisory Committee (NSAC) News & Resources Contact Information Nuclear Physics U.S. Department of Energy SC-26/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3613 F: (301) 903-3833 E: sc.np@science.doe.gov More Information » Research Isotope Development & Production for Research and Applications (IDPRA) Print Text Size: A A A RSS Feeds FeedbackShare Page The Isotope subprogram supports the production, and the development of production techniques of radioactive and stable isotopes that are in short supply for research and applications. Isotopes are high-priority

409

Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon |  

Open Energy Info (EERE)

Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon Details Activities (2) Areas (1) Regions (0) Abstract: Isotopic compositions were determined for hydrothermal quartz, calcite, and siderite from core samples of the Newberry 2 drill hole, Oregon. The Δ15O values for these minerals decrease with increasing temperatures. The values indicate that these hydrothermal minerals precipitated in isotopic equilibrium with water currently present in the reservoirs. The Δ18O values of quartz and calcite from the andesite and basalt flows (700-932 m) have isotopic values which require that the equilibrated water Δ18O values increase slightly (- 11.3 to -9.2‰) with

410

Isotopic Resonance Hypothesis: Experimental Verification by Escherichia coli Growth Measurements  

E-Print Network [OSTI]

Isotopic composition of reactants affects the rates of chemical and biochemical reactions. As a rule, enrichment of heavy stable isotopes leads to slower reactions. But the recent isotopic resonance hypothesis suggests that the dependence of the reaction rate upon the enrichment degree is not monotonous; instead, at some resonance isotopic compositions, the kinetics increases, while at off resonance compositions the same reactions progress slower. To test the predictions of this hypothesis for the elements C, H, N and O, we designed a precise (standard error plus or minus 0.05%) experiment to measure the bacterial growth parameters in minimal media with varying isotopic compositions. A number of predicted resonance conditions were tested, which kinetic enhancements as strong as plus 3% discovered at these conditions. The combined evidence extremely strongly supports the existence of isotopic resonances. This phenomenon has numerous implications for the origin of life and astrobiology, and possible application...

Xie, Xueshu

2014-01-01T23:59:59.000Z

411

Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) | Open  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) Exploration Activity Details Location Rose Valley Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References Whelan, J. A. (1 September 1990) Water geochemistry study of

412

Neutron scattering length of lithium and boron and their isotopes  

Science Journals Connector (OSTI)

Coherent neutron scattering lengths and free cross sections were measured in order to determine the spin dependent scattering lengths of the isotopes of Li and B.

L. Koester; K. Knopf; W. Waschkowski

1983-01-01T23:59:59.000Z

413

Neutron capture cross sections for neutron-rich isotopes  

Science Journals Connector (OSTI)

Average continuum (Hauser-Feshbach) and resonance (Breit-Wigner) neutron capture rates for neutron-rich isotopes, determined on the basis of...

B. Leist; W. Ziegert; M. Wiescher…

1985-01-01T23:59:59.000Z

414

Isotopic Analysis- Fluid At Fenton Hill HDR Geothermal Area ...  

Open Energy Info (EERE)

samples analyzed during this investigation were analyzed for their hydrogen and oxygen isotope contents as a part of previous studies (Goff & Grigsby, 1982; Vuataz & Goff, 1986)....

415

Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs...  

Open Energy Info (EERE)

samples analyzed during this investigation were analyzed for their hydrogen and oxygen isotope contents as a part of previous studies (Goff & Grigsby, 1982; Vuataz & Goff, 1986)....

416

Isotopic Analysis At Northern Basin & Range Region (Kennedy ...  

Open Energy Info (EERE)

useful regional reconnaissance DOE-funding Unknown Notes The correspondence of helium isotope ratios and active transtensional deformation indicates a deformation-enhanced...

417

Geothermal reservoir temperatures estimated from the oxygen isotope...  

Open Energy Info (EERE)

temperatures estimated from the oxygen isotope compositions of dissolved sulfate and water from hot springs and shallow drillholes Jump to: navigation, search GEOTHERMAL...

418

Isotopic Analysis At Nw Basin & Range Region (Kennedy & Van Soest...  

Open Energy Info (EERE)

useful regional reconnaissance DOE-funding Unknown Notes The correspondence of helium isotope ratios and active transtensional deformation indicates a deformation-enhanced...

419

Peel, Kate, Dominik Weiss, and Laura Sigg. Zinc isotope ...  

Science Journals Connector (OSTI)

Zinc isotope composition of settling particles as a proxy for biogeochemical processes in lakes: Insights from the eutrophic Lake Greifen, Switzerland. Kate Peel ...

2009-07-03T23:59:59.000Z

420

Isotopic Analysis- Fluid At Valles Caldera - Redondo Area (Rao...  

Open Energy Info (EERE)

samples analyzed during this investigation were analyzed for their hydrogen and oxygen isotope contents as a part of previous studies (Goff & Grigsby, 1982; Vuataz & Goff, 1986)....

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Isotopic Analysis At Walker-Lane Transitional Zone Region (Kennedy...  

Open Energy Info (EERE)

useful regional reconnaissance DOE-funding Unknown Notes The correspondence of helium isotope ratios and active transtensional deformation indicates a deformation-enhanced...

422

Isotopic Analysis- Fluid At Roosevelt Hot Springs Geothermal...  

Open Energy Info (EERE)

and literature review of the Roosevelt Hot Springs Geothermal Area. Notes Stable isotope analysis of thermal fluids determined meteoric origin primarily from the Mineral...

423

Lead and strontium isotopic evidence for crustal interaction...  

Open Energy Info (EERE)

strontium isotopic evidence for crustal interaction and compositional zonation in the source regions of Pleistocene basaltic and rhyolitic magmas of the Coso volcanic field,...

424

Isotopic Analysis At Jemez Springs Area (Goff, Et Al., 1981)...  

Open Energy Info (EERE)

Goff, Et Al., 1981) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis At Jemez Springs Area (Goff, Et Al., 1981) Exploration...

425

Isotopic Analysis At Jemez Springs Area (Rao, Et Al., 1996) ...  

Open Energy Info (EERE)

Rao, Et Al., 1996) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis At Jemez Springs Area (Rao, Et Al., 1996) Exploration...

426

Isotopic Analysis At Valles Caldera - Redondo Geothermal Area...  

Open Energy Info (EERE)

White, Et Al., 1992) Exploration Activity Details Location Valles Caldera - Redondo Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date - 1992 Usefulness...

427

Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs...  

Open Energy Info (EERE)

Activity: Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs Geothermal Area (White, Et Al., 1992) Exploration Activity Details Location Valles Caldera - Sulphur Springs...

428

Isotopic Analysis At Valles Caldera - Redondo Geothermal Area...  

Open Energy Info (EERE)

White, 1986) Exploration Activity Details Location Valles Caldera - Redondo Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date - 1986 Usefulness not...

429

Integrated Approach to Use Natural Chemical and Isotopic Tracers...  

Broader source: Energy.gov (indexed) [DOE]

Integrated Approach to Use Natural Chemical and Isotopic Tracers to Estimate Fracture Spacing and Surface Area in EGS Systems Integrated Approach to Use Natural Chemical and...

430

Integrated Approach to Use Natural Chemical and Isotopic Tracers...  

Broader source: Energy.gov (indexed) [DOE]

Approach to Use Natural Chemical and Isotopic Tracers to Estimate Fracture Spacing and Surface Area in EGS Systems B. Mack Kennedy (Presenter) and H. H. Liu Lawrence Berkeley...

431

Hydrogen Isotope Separation From Noble Gasses in Plasma Exhausts...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hydrogen Isotope Separation From Noble Gasses in Plasma Exhausts and Other Gas Streams --- Inventors Thomas A. Kozub, William R. Blanchard and Charles A. Gentile The objective of...

432

Isotopic Analysis- Gas At Long Valley Caldera Geothermal Area...  

Open Energy Info (EERE)

search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Gas At Long Valley Caldera Geothermal Area (Welhan, Et Al., 1988) Exploration Activity...

433

Isotopic Analysis At Mt St Helens Area (Shevenell & Goff, 1995...  

Open Energy Info (EERE)

Fraser Goff (1995) Evolution Of Hydrothermal Waters At Mount St Helens, Washington, Usa Additional References Retrieved from "http:en.openei.orgwindex.php?titleIsotopicA...

434

The use of radon (Rn-222) and volatile organic compounds in monitoring soil gas to localize NAPL contamination at a gas station in Rio Claro, São Paulo State, Brazil  

Science Journals Connector (OSTI)

Abstract This study focuses on the presence of radon (222Rn) and volatile organic compounds (VOCs) in soil gases at a gas station located in the city of Rio Claro, São Paulo, Brazil, where a fossil fuel leak occurred. The spatial distribution results show a correlation between 222Rn and VOCs, consistent with the fact that radon gas has a greater chemical affinity with organic phases than with water. This finding demonstrates that the presence of a residual hydrocarbon phase in an aquifer can retain radon, leading to a reduced radon content in the soil gas. The data in this study confirm the results of previous investigations, in which the method used in this study provided a preliminary fingerprint of a contaminated area. Furthermore, the data analysis time is brief, and only simple equipment is required.

E.Q. Barbosa; J.A. Galhardi; D.M. Bonotto

2014-01-01T23:59:59.000Z

435

E-Print Network 3.0 - arc magmatism isotopic Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

& Nakamura (1993) Nature 370 e.g. Izu arc: Ishikawa & Nakamura (1993) Nature 370 Boron isotopes help... --Th isotopes in arc magmasTh isotopes in arc magmas For equilibrium:...

436

E-Print Network 3.0 - argon isotopes Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

one of the earliest isotope... this is not always the case--see later). The naturally occurring isotopes of argon are measured by mass spectrometry... isotopes but also small...

437

E-Print Network 3.0 - argon isotopic chains Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

one of the earliest isotope... this is not always the case--see later). The naturally occurring isotopes of argon are measured by mass spectrometry... isotopes but also small...

438

E-Print Network 3.0 - atomic lines isotope Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

lines isotope Search Powered by Explorit Topic List Advanced Search Sample search results for: atomic lines isotope Page: << < 1 2 3 4 5 > >> 1 Isotope selectivity in laser cooling...

439

Apparatus for isotopic alteration of mercury vapor  

DOE Patents [OSTI]

An apparatus for enriching the isotopic Hg content of mercury is provided. The apparatus includes a reactor, a low pressure electric discharge lamp containing a fill including mercury and an inert gas. A filter is arranged concentrically around the lamp. In a preferred embodiment, constant mercury pressure is maintained in the filter by means of a water-cooled tube that depends from it, the tube having a drop of mercury disposed in it. The reactor is arranged around the filter, whereby radiation from said lamp passes through the filter and into said reactor. The lamp, the filter and the reactor are formed of a material which is transparent to ultraviolet light.

Grossman, Mark W. (Belmont, MA); George, William A. (Gloucester, MA); Marcucci, Rudolph V. (Danvers, MA)

1988-01-01T23:59:59.000Z

440

Neutron halos in the Na isotopes  

Science Journals Connector (OSTI)

The neutron and proton density distributions of the Na isotopes out to the proton and neutron drip lines are calculated in the spherical Hartree-Fock model with a wide variety of density-dependent Skyrme interactions. The results are compared to recent experimental data for the interaction cross sections and for the rms radii. We discuss the role of the deformed intruder states and the problems associated with predicting the location of the neutron drip line for this mass region. © 1996 The American Physical Society.

B. A. Brown and W. A. Richter

1996-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Final Report "Structure of Rare Isotopes"  

SciTech Connect (OSTI)

The Junior Investigator grant 'Structure of Rare Isotopes' (DE-FG02-07ER41529) supported research in low-energy nuclear theory from September 1, 2007 to August 31, 2010. It was the main goal of the proposed research to develop and optimize an occupation-number-based energy functional for the computation of nuclear masses, and this aim has been reached. Furthermore, progress was made in linking two and three-body forces from low-momentum interactions to pairing properties in nuclear density functionals, and in the description of deformed nuclei within an effective theory.

Papenbrock, Thomas

2012-05-09T23:59:59.000Z

442

Comparison of isotopic transmutation modelling codes  

E-Print Network [OSTI]

. STAMATELATOS, "Fission Product Data for Thermal Reactors Part 2: Users Manual for EPRI-CINDER Code and Data, " LA-6746-MS, Los Alamos National Laboratory (Dec. 1976). 5. H. BATEMAN, ~RGE~di gH gf ~t gym~id 6. M. J. BEIL, "ORIGEN ? The ORNL Isotope... Generation and Depletion Code, " ORNL-4628, Oak Ridge National Laboratory (May, 1973). 7. O. W. HERMANN and R. M. WESTFALL, "ORIGEN-S Scale System Module to Calculate Fuel Depletion, Actinide Transmutation, Fission Product. Buildup and Decay...

Beard, Carl Allen

1990-01-01T23:59:59.000Z

443

Nuclear Data Evaluations for Americium Isotopes  

SciTech Connect (OSTI)

Recent upgrades of 241Am, 242mAm, and 240Am nuclear data in the keV - 30-MeV range are described. The new evaluation takes advantage of recent measurements and advances in calculational modeling methods. The model calculations are especially important for the nuclear data of americium isotopes, because few measurements are available. The nuclear-model code GNASH is extensively used for our evaluations. The new evaluations are given for total, fission, capture (n, 2n), and (n, 3n) reaction cross sections, and vp for 241Am and 242mAm. A new evaluation for 240Am is also given by expanding our modeling feasibility.

Kawano, T.; Talou, P.; Chadwick, M.B.; MacFarlane, R.E.; Young, P.G. [T-16 Nuclear Physics, Los Alamos National Laboratory (United States)

2005-05-24T23:59:59.000Z

444

Raman spectroscopic and mass spectrometric investigations of the hydrogen isotopes and isotopically labelled methane  

SciTech Connect (OSTI)

Suitable analytical methods must be tested and developed for monitoring the individual process steps within the fuel cycle of a fusion reactor and for tritium accountability. The utility of laser-Raman spectroscopy accompanied by mass spectrometry with an Omegatron was investigated using the analysis of all hydrogen isotopes and isotopically labeled methanes as an example. The Omegatron is useful for analyzing all hydrogen isotopes mixed with the stable helium isotopes. The application of this mass spectrometer were demonstrated by analyzing mixtures of deuterated methanes. In addition, it was employed to study the radiochemical Witzbach exchange reaction between tritium and methanes. A laser-Raman spectrometer was designed for analysis of tritium-containing gases and was built from individual components. A tritium-compatible, metal-sealed Raman cuvette having windows with good optical properties and additional means for measuring the stray light was first used successfully in this work. The Raman spectra of the hydrogen isotopes were acquired in the pure rotation mode and in the rotation-vibration mode and were used for on. The deuterated methanes were measured by Raman spectroscopy, the wavenumbers determined were assigned to the corresponding vibrations, and the wavenumbers for the rotational fine-structure were summarized in tables. The fundamental Vibrations of the deuterated methanes produced Witzbach reactions were detected and assigned. The fundamental vibrations of the molecules were obtained with Raman spectroscopy for the first time in this work. The @-Raman spectrometer assembled is well suited for the analysis of tritium- containing gases and is practical in combination with mass spectrometry using an Omegatron, for studying gases used in fusion.

Jewett, J.R., Fluor Daniel Hanford

1997-02-24T23:59:59.000Z

445

{open_quotes}Radon{close_quotes} - the system of Soviet designed regional waste management facilities  

SciTech Connect (OSTI)

The Soviet Union established a system of specialized regional facilities to dispose of radioactive waste generated by sources other than the nuclear fuel cycle. The system had 16 facilities in Russia, 5 in Ukraine, one in each of the other CIS states, and one in each of the Baltic Republics. These facilities are still being used. The major generators of radioactive waste they process these are research and industrial organizations, medical and agricultural institution and other activities not related to nuclear power. Waste handled by these facilities is mainly beta- and gamma-emitting nuclides with half lives of less than 30 years. The long-lived and alpha-emitting isotopic content is insignificant. Most of the radwaste has low and medium radioactivity levels. The facilities also handle spent radiation sources, which are highly radioactive and contain 95-98 percent of the activity of all the radwaste buried at these facilities.

Horak, W.C.; Reisman, A.; Purvis, E.E. III

1997-07-01T23:59:59.000Z

446

E-Print Network 3.0 - assessing radio-isotope identification...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

radio-isotope identification Search Powered by Explorit Topic List Advanced Search Sample search results for: assessing radio-isotope identification Page: << < 1 2 3 4 5 > >> 1...

447

Oxygen-Isotope Exchange between CO2 and Solid Ti18O2  

Science Journals Connector (OSTI)

Oxygen-Isotope Exchange between CO2 and Solid Ti18O2 ... Analysis of the isotopic composition of the gases produced has revealed ... ...

Svatopluk Civis?; Martin Ferus; Pavel Kuba?t; Marke?ta Zukalova?; Ladislav Kavan

2011-05-17T23:59:59.000Z

448

Magnesium isotopic fractionation in chondrules from the Murchison and Murray CM2 carbonaceous chondrites  

E-Print Network [OSTI]

Magnesium isotopic fractionation in chondrules from the Murchison and Murray CM2 carbonaceous. Investigation of the magnesium isotopic compositions of chondrules can place stringent constraints on the timing

Grossman, Lawrence

449

Radioisotopic Impurities in Promethium-147 Produced at the ORNL High Flux Isotope Reactor.  

E-Print Network [OSTI]

??There is an intense interest in the availability of radioactive isotopes that could be developed into nuclear batteries. Promethium-147 is one of the isotopes of… (more)

Hinderer, James Howard

2010-01-01T23:59:59.000Z

450

E-Print Network 3.0 - analysing pb isotopes Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mobile Pb-isotopes in Proterozoic sedimentary basins as guides for exploration of uranium deposits... isotope ratios and associated trace element concentrations (U, Th and...

451

Calibration and application of the `clumped isotope' thermometer to foraminifera for high-resolution climate  

E-Print Network [OSTI]

Calibration and application of the `clumped isotope' thermometer to foraminifera for high proxies. Here, we present a new calibration of the `clumped isotope' thermometer to foraminifera based

Gilli, Adrian

452

Expert Panel: Forecast Future Demand for Medical Isotopes  

Broader source: Energy.gov (indexed) [DOE]

Expert Panel: Expert Panel: Forecast Future Demand for Medical Isotopes March 1999 Expert Panel: Forecast Future Demand for Medical Isotopes September 25-26, 1998 Arlington, Virginia The Expert Panel ............................................................................................. Page 1 Charge To The Expert Panel........................................................................... Page 2 Executive Summary......................................................................................... Page 3 Introduction ...................................................................................................... Page 4 Rationale.......................................................................................................... Page 6 Economic Analysis...........................................................................................

453

Equilibrium Isotope Effects as a Probe of Nonbonding Attractions  

Science Journals Connector (OSTI)

Equilibrium Isotope Effects as a Probe of Nonbonding Attractions ... Nonbonding interactions that occur in host?guest systems and the active sites of enzymes are altered by isotopic substitutions.1 For example, the binding affinities of caffeine isotopomers to human serum albumin vary considerably. ...

Yi-Lei Zhao; K. N. Houk; Dalit Rechavi; Alessandro Scarso; Julius Rebek, Jr.

2004-08-27T23:59:59.000Z

454

RADIOGENIC ISOTOPES: TRACERS OF PAST OCEAN CIRCULATION AND EROSIONAL INPUT  

E-Print Network [OSTI]

in the ocean has varied as a function of changes in paleocircu- lation, source provenances, style and intensity-established paleoceano- graphic tracers such as carbon isotopes. INDEX TERMS: 1040 Geochemistry: Isotopic composition Atlantic Deep Water (NADW) according to latest estimates based on results of the World Ocean Circulation

Jellinek, Mark

455

Stable Isotope Tracers in the Life Sciences and Medicine  

Science Journals Connector (OSTI)

...the result of cumulative isotope effects...reduced carbon + oils HCO3z solid carbonates...medicine. As production of stable isotopes...Meyerson and E. K. Fields, Science 166...H. Kollman, Production of Algae Containing...et al., Mass Production of Chlorella...Chicago, Chicago, Illinois. The present...

N. A. Matwiyoff; D. G. Ott

1973-09-21T23:59:59.000Z

456

Constraining magnesium cycling in marine sediments using magnesium isotopes  

E-Print Network [OSTI]

Constraining magnesium cycling in marine sediments using magnesium isotopes J.A. Higgins *, D Abstract Magnesium concentrations in deep-sea sediment pore-fluids typically decrease down core due to net and differentiate these processes, we have measured magnesium isotopes in pore-fluids and sediment samples from

Paytan, Adina

457

Measuring the Isotopic Composition of Solar Wind Noble Gases  

E-Print Network [OSTI]

noble gases. #12;Exploring the Solar Wind94 Light solar wind noble gases were directly measured by mass of the light gases are known to vary with energy, so none of these provided solar isotopic and elemental5 Measuring the Isotopic Composition of Solar Wind Noble Gases Alex Meshik, Charles Hohenberg, Olga

458

Special Application Thermoelectric Micro Isotope Power Sources  

SciTech Connect (OSTI)

Promising design concepts for milliwatt (mW) size micro isotope power sources (MIPS) are being sought for use in various space and terrestrial applications, including a multitude of future NASA scientific missions and a range of military applications. To date, the radioisotope power sources (RPS) used on various space and terrestrial programs have provided power levels ranging from one-half to several hundred watts. In recent years, the increased use of smaller spacecraft and planned new scientific space missions by NASA, special terrestrial and military applications suggest the need for lower power, including mW level, radioisotope power sources. These power sources have the potential to enable such applications as long-lived meteorological or seismological stations distributed across planetary surfaces, surface probes, deep space micro-spacecraft and sub-satellites, terrestrial sensors, transmitters, and micro-electromechanical systems. The power requirements are in the range of 1 mW to several hundred mW. The primary technical requirements for space applications are long life, high reliability, high specific power, and high power density, and those for some special military uses are very high power density, specific power, reliability, low radiological induced degradation, and very low radiation leakage. Thermoelectric conversion is of particular interest because of its technological maturity and proven reliability. This paper summarizes the thermoelectric, thermal, and radioisotope heat source designs and presents the corresponding performance for a number of mW size thermoelectric micro isotope power sources.

Heshmatpour, Ben; Lieberman, Al; Khayat, Mo; Leanna, Andrew; Dobry, Ted [Teledyne Energy Systems, Incorporated, 10707 Gilroy Road, Hunt Valley, MD 21031 (United States)

2008-01-21T23:59:59.000Z

459

Global Security, Medical Isotopes, and Nuclear Science  

SciTech Connect (OSTI)

Over the past century basic nuclear science research has led to the use of radioactive isotopes into a wide variety of applications that touch our lives everyday. Some are obvious, such as isotopes for medical diagnostics and treatment. Others are less so, such as National/Global security issues. And some we take for granted, like the small amount of 241Am that is in every smoke detector. At the beginning of this century, we are in a position where the prevalence and importance of some applications of nuclear science are pushing the basic nuclear science community for improved models and nuclear data. Yet, at the same time, the push by the basic nuclear science community to study nuclei that are farther and farther away from stability also offer new opportunities for many applications. This talk will look at several global security applications of nuclear science, summarizing current R&D and need for improved nuclear data It will also look at how applications of nuclear science, such as to medicine, will benefit from the push for more and more powerful radioactive ion beam facilities.

Ahle, L E

2007-09-17T23:59:59.000Z

460

Geothermal reservoir temperatures estimated from the oxygen isotope  

Open Energy Info (EERE)

reservoir temperatures estimated from the oxygen isotope reservoir temperatures estimated from the oxygen isotope compositions of dissolved sulfate and water from hot springs and shallow drillholes Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Geothermal reservoir temperatures estimated from the oxygen isotope compositions of dissolved sulfate and water from hot springs and shallow drillholes Details Activities (3) Areas (3) Regions (0) Abstract: The oxygen isotope compositions of dissolved sulfate and water from hot springs and shallow drillholes have been tested as a geothermometer in three areas of the western United States. Limited analyses of spring and borehole fluids and existing experimental rate studies suggest that dissolved sulfate and water are probably in isotopic equilibrium in all reservoirs of significant size with temperatures above

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor  

Broader source: Energy.gov (indexed) [DOE]

Oak Ridge National Laboratory High Flux Isotope Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Engineering Program portion of an Operational Readiness Review of the Oak Ridge National Laboratory, High Flux Isotope Reactor. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR More Documents & Publications

462

Expert Panel: Forecast Future Demand for Medical Isotopes | Department of  

Broader source: Energy.gov (indexed) [DOE]

Expert Panel: Forecast Future Demand for Medical Isotopes Expert Panel: Forecast Future Demand for Medical Isotopes Expert Panel: Forecast Future Demand for Medical Isotopes The Expert Panel has concluded that the Department of Energy and National Institutes of Health must develop the capability to produce a diverse supply of radioisotopes for medical use in quantities sufficient to support research and clinical activities. Such a capability would prevent shortages of isotopes, reduce American dependence on foreign radionuclide sources and stimulate biomedical research. The expert panel recommends that the U.S. government build this capability around either a reactor, an accelerator or a combination of both technologies as long as isotopes for clinical and research applications can be supplied reliably, with diversity in adequate

463

Cancer-fighting treatment gets boost from Isotope Production Facility  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cancer-fighting treatment gets boost from Isotope Production Cancer-fighting treatment gets boost from Isotope Production Facility Cancer-fighting treatment gets boost from Isotope Production Facility New capability expands existing program, creates treatment product in quantity. April 13, 2012 Medical Isotope Work Moves Cancer Treatment Agent Forward Medical Isotope Work Moves Cancer Treatment Agent Forward - Los Alamos scientist Meiring Nortier holds a thorium foil test target for the proof-of-concept production experiments. Research indicates that it will be possible to match current annual, worldwide production of Ac-225 in just two to five days of operations using the accelerator at Los Alamos and analogous facilities at Brookhaven. Alpha particles are energetic enough to destroy cancer cells but are unlikely to move beyond a tightly controlled target region and destroy

464

Enforcement Letter, International Isotopes Idaho Inc - August 20, 1999 |  

Broader source: Energy.gov (indexed) [DOE]

International Isotopes Idaho Inc - August 20, International Isotopes Idaho Inc - August 20, 1999 Enforcement Letter, International Isotopes Idaho Inc - August 20, 1999 August, 20, 1999 Issued to International Isotopes Idaho, Inc. related to the Relocation of an Irradiated Pellet at the Test Reactor Area Hot Cell Facility at the Idaho National Engineering and Environmental Laboratory This letter refers to the Department of Energy's (DOE) evaluation of the facts and circumstances concerning the relocation of an irradiated [isotope] pellet from within a hot cell to an adjoining, outside, charging port service area. This incident occurred on January 6, 1999, at the Idaho National Engineering and Environmental Laboratory's Test Reactor Area Hot Cell Facility (TRA-632). Building TRA-632 is utilized by International

465

A Helium Isotope Perspective On The Dixie Valley, Nevada, Hydrothermal  

Open Energy Info (EERE)

Helium Isotope Perspective On The Dixie Valley, Nevada, Hydrothermal Helium Isotope Perspective On The Dixie Valley, Nevada, Hydrothermal System Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Helium Isotope Perspective On The Dixie Valley, Nevada, Hydrothermal System Details Activities (3) Areas (1) Regions (0) Abstract: Fluids from springs, fumaroles, and wells throughout Dixie Valley, NV were analyzed for noble gas abundances and isotopic compositions. The helium isotopic compositions of fluids produced from the Dixie Valley geothermal field range from 0.70 to 0.76 Ra, are among the highest values in the valley, and indicate that similar to 7.5% of the total helium is derived from the mantle. A lack of recent volcanics or other potential sources requires flow of mantle-derived helium up along the

466

CRAD, Management - Oak Ridge National Laboratory High Flux Isotope Reactor  

Broader source: Energy.gov (indexed) [DOE]

Oak Ridge National Laboratory High Flux Isotope Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR CRAD, Management - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Management portion of an Operational Readiness Review of the Oak Ridge National Laboratory High Flux Isotope Reactor. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Management - Oak Ridge National Laboratory High Flux Isotope Reactor Contractor ORR More Documents & Publications

467

CRAD, Training - Oak Ridge National Laboratory High Flux Isotope Reactor |  

Broader source: Energy.gov (indexed) [DOE]

Reactor Reactor CRAD, Training - Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Training Program in preparation for restart of the Oak Ridge National Laboratory High Flux Isotope Reactor. RADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Training - Oak Ridge National Laboratory High Flux Isotope Reactor More Documents & Publications CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Training - Oak Ridge National Laboratory High Flux Isotope Reactor

468

CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor  

Broader source: Energy.gov (indexed) [DOE]

Reactor Reactor CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Maintenance Program in preparation for restart of the Oak Ridge National Laboratory High Flux Isotope Reactor. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor More Documents & Publications CRAD, Safety Basis - Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Maintenance - Oak Ridge National Laboratory High Flux Isotope Reactor

469

Isotopic Analysis-Fluid At Yellowstone Caldera Geothermal Region (1977) |  

Open Energy Info (EERE)

Isotopic Analysis-Fluid At Yellowstone Caldera Geothermal Region (1977) Isotopic Analysis-Fluid At Yellowstone Caldera Geothermal Region (1977) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis-Fluid At Yellowstone Caldera Geothermal Region (1977) Exploration Activity Details Location Yellowstone Caldera Geothermal Region Exploration Technique Isotopic Analysis-Fluid Activity Date 1977 Usefulness not indicated DOE-funding Unknown Exploration Basis Estimate deep reservoir temperature Notes The oxygen isotope compositions of dissolved sulfate and water from hot springs and shallow drillholes have been tested. Methods are described to calculate the effects of boiling and dilution. The geothermometer, is applied to thermal systems of Yellowstone Park, Wyoming, Long Valley, California, and Raft River, Idaho to estimate deep reservoir temperatures

470

CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux Isotope  

Broader source: Energy.gov (indexed) [DOE]

CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux Isotope Reactor CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux Isotope Reactor February 2007 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a February 2007 assessment of the Nuclear Safety Program in preparation for restart of the Oak Ridge National Laboratory High Flux Isotope Reactor. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Nuclear Safety - Oak Ridge National Laboratory High Flux Isotope Reactor More Documents & Publications CRAD, Engineering - Oak Ridge National Laboratory High Flux Isotope Reactor

471

Enforcement Letter, International Isotopes Idaho Inc - August 20, 1999 |  

Broader source: Energy.gov (indexed) [DOE]

International Isotopes Idaho Inc - August 20, International Isotopes Idaho Inc - August 20, 1999 Enforcement Letter, International Isotopes Idaho Inc - August 20, 1999 August, 20, 1999 Issued to International Isotopes Idaho, Inc. related to the Relocation of an Irradiated Pellet at the Test Reactor Area Hot Cell Facility at the Idaho National Engineering and Environmental Laboratory This letter refers to the Department of Energy's (DOE) evaluation of the facts and circumstances concerning the relocation of an irradiated [isotope] pellet from within a hot cell to an adjoining, outside, charging port service area. This incident occurred on January 6, 1999, at the Idaho National Engineering and Environmental Laboratory's Test Reactor Area Hot Cell Facility (TRA-632). Building TRA-632 is utilized by International

472

Evidence of natural isotopic distribution from single-molecule SERS  

E-Print Network [OSTI]

We report on the observation of the natural isotopic spread of carbon from single-molecule Surface Enhanced Raman Spectroscopy (SM-SERS). By choosing a dye molecule with a very localized Raman active vibration in a cyano bond (C$\\equiv$N triple bond), we observe (in a SERS colloidal liquid) a small fraction of SM-SERS events where the frequency of the cyano mode is softened and in agreement with the effect of substituting $^{12}$C by the next most abundant $^{13}$C isotope. This example adds another demonstration of single molecule sensitivity in SERS through isotopic editing which is done, in this case, not by artificial isotopic editing but rather by nature itself. It also highlights SERS as a unique spectroscopic tool, capable of detecting an isotopic change in one atom of a single molecule.

P. G. Etchegoin; E. C. Le Ru; M. Meyer

2008-11-03T23:59:59.000Z

473

Selective detection of minor isotope lines in saturated absorption spectra by absorption filtering of major isotope lines  

Science Journals Connector (OSTI)

We demonstrate a simple method that can be used to detect minor isotope lines in a saturated absorption spectrum by the absorption filtering of major isotope lines. We investigate this method for use in...1S0-1P1

Yugo Onoda; Kazuhiko Sugiyama; Masao Kitano

2011-07-01T23:59:59.000Z

474

Understanding Partition Coefficient, Kd, Values Volume II: Review of Geochemistry and Available Kd Values for Cadmium, Cesium, Chromium, Lead, Plutonium, Radon, Strontium, Thorium, Tritium (3H), and Uranium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Air and Radiation Air and Radiation EPA 402-R-99-004B Environmental Protection August 1999 Agency UNDERSTANDING VARIATION IN PARTITION COEFFICIENT, K d , VALUES Volume II: Review of Geochemistry and Available K d Values for Cadmium, Cesium, Chromium, Lead, Plutonium, Radon, Strontium, Thorium, Tritium ( 3 H), and Uranium UNDERSTANDING VARIATION IN PARTITION COEFFICIENT, K d , VALUES Volume II: Review of Geochemistry and Available K d Values for Cadmium, Cesium, Chromium, Lead, Plutonium, Radon, Strontium, Thorium, Tritium ( 3 H), and Uranium August 1999 A Cooperative Effort By: Office of Radiation and Indoor Air Office of Solid Waste and Emergency Response U.S. Environmental Protection Agency Washington, DC 20460 Office of Environmental Restoration U.S. Department of Energy Washington, DC 20585

475

Thoron and decay products, beyond UNSCEAR 2006 Annex E  

Science Journals Connector (OSTI)

......uranium, tin, tantalum, niobium, rare earths, aluminum, some copper and...elevated radioactivity levels in phosphogypsum arising from the production of phosphate...226Ra 0.1-15 000 Residue (rare earth extraction) 228Ra 20-3000......

D. B. Chambers

2010-10-01T23:59:59.000Z

476

Carbon isotope fractionation in protoplanetary disks  

E-Print Network [OSTI]

We investigate the gas-phase and grain-surface chemistry in the inner 30 AU of a typical protoplanetary disk using a new model which calculates the gas temperature by solving the gas heating and cooling balance and which has an improved treatment of the UV radiation field. We discuss inner-disk chemistry in general, obtaining excellent agreement with recent observations which have probed the material in the inner regions of protoplanetary disks. We also apply our model to study the isotopic fractionation of carbon. Results show that the fractionation ratio, 12C/13C, of the system varies with radius and height in the disk. Different behaviour is seen in the fractionation of different species. We compare our results with 12C/13C ratios in the Solar System comets, and find a stark contrast, indicative of reprocessing.

Paul M. Woods; Karen Willacy

2008-12-01T23:59:59.000Z

477

Penning trap mass measurements on nobelium isotopes  

SciTech Connect (OSTI)

The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt allows accurate mass measurements of radionuclides, produced in fusion-evaporation reactions and separated by the velocity filter SHIP from the primary beam. Recently, the masses of the three nobelium isotopes {sup 252-254}No were determined. These are the first direct mass measurements of transuranium elements, which provide new anchor points in this region. The heavy nuclides were produced in cold-fusion reactions by irradiating a PbS target with a {sup 48}Ca beam, resulting in production rates of the nuclei of interest of about one atom per second. In combination with data from decay spectroscopy our results are used to perform a new atomic-mass evaluation in this region.

Dworschak, M.; Block, M.; Ackermann, D.; Herfurth, F.; Hessberger, F. P.; Hofmann, S.; Vorobyev, G. K. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Audi, G. [CSNSM-IN2P3-CNRS, F-91405 Orsay-Campus (France); Blaum, K. [Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany); Ruprecht-Karls-Universitaet, D-69120 Heidelberg (Germany); Droese, C.; Marx, G.; Schweikhard, L. [Ernst-Moritz-Arndt-Universitaet, Institut fuer Physik, D-17487 Greifswald (Germany); Eliseev, S.; Ketter, J. [Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany); Fleckenstein, T. [Justus-Liebig-Universitaet Giessen, D-35390 Giessen (Germany); Haettner, E.; Plass, W. R.; Scheidenberger, C. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Justus-Liebig-Universitaet Giessen, D-35390 Giessen (Germany); Ketelaer, J. [Johannes Gutenberg-Universitaet, Institut fuer Physik, D-55099 Mainz (Germany); Kluge, H.-J. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Ruprecht-Karls-Universitaet, D-69120 Heidelberg (Germany)

2010-06-15T23:59:59.000Z

478

Isotopes Np240 and Np241  

Science Journals Connector (OSTI)

The 1-hour neptunium activity which had previously been assigned to Np241 has been identified as the lower isomer of Np240. The decay energy of the 1-hour Np240 has been found to be 2.05 Mev compared with 2.18 Mev for that of the 7.3-min Np240. Gamma rays of energies 1160, 1000, 915, 595, 565, 435, 245, 160, and 85 kev have been found to be associated with the decay of Np240. The best value for the half-life of Np240 is 63±2 min. The isotope Np241 has been found to have a 16-min half-life with strong evidence for an isomer with a 3.4-hour half-life.

Richard M. Lessler and Maynard C. Michel

1960-04-01T23:59:59.000Z

479

int. j. radiat. biol 2002, vol. 78, no. 7, 593 604 Do low dose-rate bystander eVects in uence domestic radon risks?  

E-Print Network [OSTI]

int. j. radiat. biol 2002, vol. 78, no. 7, 593± 604 Do low dose-rate bystander eVects in uence that bystander radon risk estimation. eVects can be induced by high-LET radiation even Conclusions : Bystander e of inverse dose-rate eVects by high- exposed to low doses of low-LET radiation (SawantLET radiation

Brenner, David Jonathan

480

Hydrogen isotope fractionation in algae: III. Theoretical interpretations  

Science Journals Connector (OSTI)

Abstract Hydrogen isotope measurements of lipid biomarkers preserved in sediments are most commonly interpreted as qualitative, rather than quantitative indicators of paleoprecipitation owing to an imperfect knowledge of all factors controlling the isotopic fractionation occurring during biosynthesis. Here, we first offer a brief review of appropriate procedures for preparing enriched isotope substrates for use in tracer studies and outline the approximate ?D threshold at which this transition occurs. We then present new interpretations to explain deviations from common stable isotope effects observed in our previous culture experiments and other studies. We draw particular attention to the disagreement between intercept and slope for product–substrate relationships from those predicted for isotope systems, even when R2 values are high, and attribute it to kinetic isotope fractionation. We demonstrate that reconstructing paleoenvironmental water ?D values by simply adding a ? to measured biomarkers ?D values will result in a bias toward deuterium enriched values. This applies even to implicit reconstructions in the form of qualitative interpretations of measured lipid ?D values as indicators of past hydroclimate. We therefore recommend reconstructing water ?D values from lipid ?D values using fractionation factor (?). We also discuss the apparently contradictory increase in D/H fractionation observed at elevated temperature and suggest that this may be the result of the unique wave-particle duality of hydrogen isotopes, which permits isotopologues to avoid surmounting the activation energy barrier that is necessary in traditional kinetic reactions.

Zhaohui Zhang; Daniel B. Nelson; Julian P. Sachs

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radon thoron isotopic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Isotopic studies of Yucca Mountain soil fluids and carbonate pedogenesis  

SciTech Connect (OSTI)

Secondary carbonates occurring within the soils, faults, and subsurface fractures of Yucca Mountain contain some of the best available records of paleoclimate and palehydrology for the potential radioactive waste repository site. This article discusses conceptual and analytical advances being made with regard to the interpretation of stable isotope data from pedogenic carbonates, specifically related to the {sup 13}C content of soil CO{sub 2}, CaCO{sub 3}, precipitation mechanisms, and isotopic fractionations between parent fluids and precipitating carbonates. The {sup 13}C content of soil carbon dioxide from Yucca Mountain and vicinity shows most of the usual patterns expected in such contexts: Decreasing {sup 13}C content with depth decreasing {sup 13}C with altitude and reduced {sup 13}C during spring. These patterns exist within the domain of a noisy data set; soil and vegetational heterogeneities, weather, and other factors apparently contribute to isotopic variability in the system. Several soil calcification mechanisms appear to be important, involving characteristic physical and chemical environments and isotopic fractionations. When CO{sub 2} loss from thin soil solutions is an important driving factor, carbonates may contain excess heavy isotopes, compared to equilibrium precipitation with soil fluids. When root calcification serves as a proton generator for plant absorption of soil nutrients, heavy isotope deficiencies are likely. Successive cycles of dissolution and reprecipitation mix and redistribute pedogenic carbonates, and tend to isotopically homogenize and equilibrate pedogenic carbonates with soil fluids.

McConnaughey, T.A.; Whelan, J.F.; Wickland, K.P.; Moscati, R.J.

1994-12-31T23:59:59.000Z

482

Deep-Sea Research I 53 (2006) 684688 Experimental evaluation of the isotopic exchange equilibrium  

E-Print Network [OSTI]

on the ion-exchange separation of boron isotopes. Bulletin of Chemical Society of Japan 50, 158­163]. Since strengths. r 2006 Elsevier Ltd. All rights reserved. Keywords: Boron isotopes; Boron isotopic exchange. Introduction The boron isotopic composition of marine carbonates constitutes a promising tracer of the paleo

Kaufman, Alan Jay

483

Model calculations of the hydrogen/deuterium kinetic isotope effect in the atomic hydrogen + disilane reaction  

Science Journals Connector (OSTI)

Model calculations of the hydrogen/deuterium kinetic isotope effect in the atomic hydrogen + disilane reaction ...

I. Safarik; T. L. Pollock; O. P. Strausz

1974-01-01T23:59:59.000Z

484

Glaciation, aridification, and carbon sequestration in the Permo-Carboniferous: The isotopic record from low latitudes  

E-Print Network [OSTI]

Glaciation, aridification, and carbon sequestration in the Permo-Carboniferous: The isotopic record and carbon sequestration in the Late Paleozoic, we have compiled new and published oxygen and carbon isotopic Carboniferous Stable isotopes Carbon cycling Brachiopods To evaluate the isotopic record of climate change

Grossman, Ethan L.

485

Isotope mass shift for two-electron atoms Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia  

E-Print Network [OSTI]

, 188300, Russia (Dated: 29 April 2004) Accurate calculations of the isotope shift for atomic transitions

Kozlov, Mikhail G

486

Isotope mass shift for two-electron atoms II Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia  

E-Print Network [OSTI]

, Gatchina, 188300, Russia (Dated: 31 October 2006) Accurate calculations of the isotope shift for atomic

Kozlov, Mikhail G

487

Stable isotope studies. Final report, March 1, 1972--February 29, 1992  

SciTech Connect (OSTI)

The research has been in four general areas: (1) correlation of isotope effects with molecular forces and molecular structures, (2) correlation of zero-point energy and its isotope effects with molecular structure and molecular forces, (3) vapor pressure isotope effects, and (4) fractionation of stable isotopes. 73 refs, 38 figs, 29 tabs.

Ishida, T.

1992-10-01T23:59:59.000Z

488

Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, 18  

E-Print Network [OSTI]

Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, 18 O, D: Noble gases Strontium isotopes Helium isotopes Geothermal energy Los Azufres Araró Mexico Isotopes of noble gases, CO2, H2O and Sr were measured in 10 geothermal wells and 8 hot springs, fumaroles and mud

Long, Bernard

489

Isotopic Analysis At Yellowstone Region (Sturchio, Et Al., 1990) | Open  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Isotopic Analysis At Yellowstone Region (Sturchio, Et Al., 1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Yellowstone Region (Sturchio, Et Al., 1990) Exploration Activity Details Location Yellowstone Caldera Geothermal Region Exploration Technique Isotopic Analysis- Fluid Activity Date Usefulness could be useful with more improvements DOE-funding Unknown Notes There are two possible explanations for the inferred presence of relatively 18O-enriched thermal water at Yellowstone in the past: (1) meteoric

490

Isotope effect in the presence of a pseudogap  

Science Journals Connector (OSTI)

We investigate the question of whether the unusual doping dependence of the isotope exponent observed in underdoped high-Tc superconductors might be related to another unusual phenomenon observed in these systems: the pseudogap phenomenon. Within different approximations we study the influence of a phenomenological pseudogap on the isotope exponent and find that it generally strongly increases the isotope exponent, in qualitative agreement with experiments on underdoped high-Tc compounds. This result is stable against strong-coupling self-energy corrections and also holds for recently proposed spin-fluctuation exchange models, if a weak additional electron-phonon coupling is considered.

T. Dahm

2000-03-01T23:59:59.000Z

491

Lithium Isotope Analyses of Inorganic Constituents from the Murchison Meteorite  

Science Journals Connector (OSTI)

Aqueous processes were important modifiers of solid matter during the early stages of solar system history. Lithium isotopes are sensitive indicators of such solid-liquid interactions because 7Li passes preferentially into solution and 6Li remains behind in the solid phase. Lithium isotope ratios of inorganic phases in the Murchison meteorite reveal that the value for the whole rock is simply the average of individual components with widely different isotopic compositions. 7Li content increases from chondrules to phyllosilicate-rich matrices to carbonates, as would be expected from the relative duration each component has spent during aqueous alteration on the parent asteroid.

Mark A. Sephton; Rachael H. James; Philip A. Bland

2004-01-01T23:59:59.000Z

492

Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs Area (White,  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs Area (White, Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs Area (White, Et Al., 1992) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs Area (White, Et Al., 1992) Exploration Activity Details Location Valles Caldera - Sulphur Springs Area Exploration Technique Isotopic Analysis- Fluid Activity Date Usefulness not indicated DOE-funding Unknown Notes Used various geochemical techniques to obtain data from which information regarding mass transfer rates. This then led to conclucions of the history/evolution of the geothermal system. Unclear whether useful for exploration purposes. References Art F. White, Nancy J. Chuma, Fraser Goff (1992) Mass Transfer Constraints On The Chemical Evolution Of An Active Hydrothermal System,

493

Chemical And Isotopic Investigation Of Warm Springs Associated With Normal  

Open Energy Info (EERE)

Isotopic Investigation Of Warm Springs Associated With Normal Isotopic Investigation Of Warm Springs Associated With Normal Faults In Utah Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Chemical And Isotopic Investigation Of Warm Springs Associated With Normal Faults In Utah Details Activities (3) Areas (1) Regions (0) Abstract: Thermal springs associated with normal faults in Utah have been analyzed for major cations and anions, and oxygen and hydrogen isotopes. Springs with measured temperatures averaging greater than 40°C are characterized by Na + K- and SO4 + Cl-rich waters containing 103 to 104 mg/l of dissolved solids. Lower temperature springs, averaging less than 40°C, are more enriched in Ca + Mg relative to Na + K. Chemical variations monitored through time in selected thermal springs are probably produced by

494

Fact Sheet: Facility For Rare Isotope Beams (FRIB) Applicant Selection |  

Broader source: Energy.gov (indexed) [DOE]

Facility For Rare Isotope Beams (FRIB) Applicant Facility For Rare Isotope Beams (FRIB) Applicant Selection Fact Sheet: Facility For Rare Isotope Beams (FRIB) Applicant Selection December 11, 2008 - 8:51am Addthis Based on the analyses and recommendations over the last decade, the U.S. Department of Energy (DOE) Office of Science determined that the establishment of a Facility for Rare Isotope Beams (FRIB) is a high priority for the future of U.S. nuclear science research. This determination and supporting rationale are reflected in the DOE/ National Science Foundation Nuclear Science Advisory Committee's 2007 Long Range Plan and the 2003 DOE report, "Facilities for the Future of Science: A Twenty-Year Outlook." A Funding Opportunity Announcement (FOA) was used to solicit applications for the conceptual design and establishment of FRIB in order

495

Report of Survey of Oak Ridge Isotope Enrichment (Calutron) Facility  

Broader source: Energy.gov (indexed) [DOE]

Isotope Enrichment (Calutron) Isotope Enrichment (Calutron) Facility Building 9204-3 Report of Survey of Oak Ridge Isotope Enrichment (Calutron) Facility Building 9204-3 The purpose of this document is to report the results of a survey conducted at the Isotope Enrichment Facility (IEF, Calutron, Building 9204-3) on the Y-12 Plant property at the Oak Ridge Site. The survey was conducted during the week of November 29, 1999. The primary purpose of the survey is to identify facility conditions and to define the characterization, stabilization, and material/waste/equipment removal (if any) requirements that need to be met to transfer responsibility for the facility from the Office of Nuclear Energy (NE) to the Office of Environmental Management (EM). Additionally, estimated post stabilization surveillance and maintenance (S&M) activities and costs are

496

A Strontium Isotopic Study Of Newberry Volcano, Central Oregon- Structural  

Open Energy Info (EERE)

Strontium Isotopic Study Of Newberry Volcano, Central Oregon- Structural Strontium Isotopic Study Of Newberry Volcano, Central Oregon- Structural And Thermal Implications Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Strontium Isotopic Study Of Newberry Volcano, Central Oregon- Structural And Thermal Implications Details Activities (2) Areas (1) Regions (0) Abstract: Ratios of 87Sr/86Sr were determined in twenty-seven basaltic rocks from Newberry. These ratios range from 0.70330 to 0.70414; most fall between 0.7035 and 0.7038. Covariance of Al2O3/FeO* ratio, TiO2 content, and Th content with 87Sr/86Sr suggests that some isotopic ratios reflect shallow crustal contamination, but the data also suggest that two mantle sources, a prominent one at 0.7036 and a less-prominent one at 0.7033 or less, are represented. The hypothesis of crustal contamination is supported

497

The High Flux Isotope Reactor at Oak Ridge National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages

The High Flux Isotope Reactor at ORNL The High Flux Isotope Reactor at ORNL Aerial of the High Flux Isotope Reactor Site The High Flux Isotope Reactor site is located on the south side of the ORNL campus and is about a three-minute drive from her sister neutron facility, the Spallation Neutron Source. Operating at 85 MW, HFIR is the highest flux reactor-based source of neutrons for research in the United States, and it provides one of the highest steady-state neutron fluxes of any research reactor in the world. The thermal and cold neutrons produced by HFIR are used to study physics, chemistry, materials science, engineering, and biology. The intense neutron flux, constant power density, and constant-length fuel cycles are used by more than 500 researchers each year for neutron scattering research into

498

A major lithospheric boundary in eastern California defined by isotope  

Open Energy Info (EERE)

major lithospheric boundary in eastern California defined by isotope major lithospheric boundary in eastern California defined by isotope ratios in Cenozoic basalts from the Coso Range and surrounding areas Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: A major lithospheric boundary in eastern California defined by isotope ratios in Cenozoic basalts from the Coso Range and surrounding areas Details Activities (1) Areas (1) Regions (0) Abstract: Sr and Nd isotope ratios of Miocene-Recent basalts in eastern California, when screened for crustal contamination, vary dramatically and indicate the presence of a major lithospheric boundary that is not obvious from surface geology. Tectonic and geochemical interpretation of this boundary is difficult, however, because there are so many potential

499

Oxygen And Carbon Isotope Ratios Of Hydrothermal Minerals From Yellowstone  

Open Energy Info (EERE)

Oxygen And Carbon Isotope Ratios Of Hydrothermal Minerals From Yellowstone Oxygen And Carbon Isotope Ratios Of Hydrothermal Minerals From Yellowstone Drill Cores Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Oxygen And Carbon Isotope Ratios Of Hydrothermal Minerals From Yellowstone Drill Cores Details Activities (3) Areas (1) Regions (0) Abstract: Oxygen and carbon isotope ratios were measured for hydrothermal minerals (silica, clay and calcite) from fractures and vugs in altered rhyolite, located between 28 and 129 m below surface (in situ temperatures ranging from 81 to 199°C) in Yellowstone drill holes. The purpose of this study was to investigate the mechanism of formation of these minerals. The Δ18O values of the thirty-two analyzed silica samples (quartz, chalcedony, α-cristobalite, and β-cristobalite) range from -7.5 to +2.8‰. About one

500

Isotopic Analysis- Fluid At Coso Geothermal Area (1990) | Open Energy  

Open Energy Info (EERE)

Analysis- Fluid At Coso Geothermal Area (1990) Analysis- Fluid At Coso Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Coso Geothermal Area (1990) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References Whelan, J. A. (1 September 1990) Water geochemistry study of Indian Wells Valley, Inyo and Kern Counties, California. Supplement.