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Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991

Technical Report:

Abstract

The natural production of radionuclides in the geosphere is of importance in studies of the residence time of old groundwater as well as in the determination of the migration rates of long-lived radio-nuclides from underground disposal sites of radioactive waste. Estimation of production rates of radionuclides originating in the spontaneous fission of uranium (e.g. {sup 81}Kr, {sup 129}I, {sup 99}Tc), or in reactions with thermal neutrons (e.g. {sup 36}Cl), has been described in a number of publications. The method of determining the neutron energy spectrum in various types of rock and the calculation of production rates and equilibrium concentrations of certain radionuclides are known for some elements. Estimation of the production of nuclides in nuclear reactions with fast neutrons in the rock formation is possible when the neutron energy distribution is known. One of the best possible approaches to this question is by application of a multigroup diffusion approximation. The main limitation of this estimation is the necessary assumption of the homogeneity of the distribution of all elements in the rock matrix. The mineralogical structure of the rock, as well as the fact that uranium and thorium-rich minerals are often concentrated close to the fracture zones and microfissures, plays an  More>>
Authors:
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
IAEA-R-5060-F
Reference Number:
SCA: 540230; 580000; PA: AIX-23:010939; SN: 92000637690
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; UNDERGROUND; ISOTOPE DATING; NEUTRON FLUX; YEARS LIVING RADIOISOTOPES; ISOTOPE RATIO; NATURAL OCCURRENCE; ARGON 39; CARBON 14; CHEMICAL COMPOSITION; CHLORINE 36; ENERGY SPECTRA; EXPERIMENTAL DATA; GEOLOGIC FORMATIONS; GROUND WATER; IODINE 129; KRYPTON 85; NEPTUNIUM 237; PLUTONIUM 239; ROCKS; TECHNETIUM 99; TRITIUM; URANIUM; 540230; 580000; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT; GEOSCIENCES
Sponsoring Organizations:
Institute of Physics and Nuclear Techniques, Cracow (Poland)
OSTI ID:
10111845
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE92613458; TRN: XA9130232010939
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
33 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Florkowski, T. Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991. IAEA: N. p., 1991. Web.
Florkowski, T. Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991. IAEA.
Florkowski, T. 1991. "Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991." IAEA.
@misc{etde_10111845,
title = {Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991}
author = {Florkowski, T}
abstractNote = {The natural production of radionuclides in the geosphere is of importance in studies of the residence time of old groundwater as well as in the determination of the migration rates of long-lived radio-nuclides from underground disposal sites of radioactive waste. Estimation of production rates of radionuclides originating in the spontaneous fission of uranium (e.g. {sup 81}Kr, {sup 129}I, {sup 99}Tc), or in reactions with thermal neutrons (e.g. {sup 36}Cl), has been described in a number of publications. The method of determining the neutron energy spectrum in various types of rock and the calculation of production rates and equilibrium concentrations of certain radionuclides are known for some elements. Estimation of the production of nuclides in nuclear reactions with fast neutrons in the rock formation is possible when the neutron energy distribution is known. One of the best possible approaches to this question is by application of a multigroup diffusion approximation. The main limitation of this estimation is the necessary assumption of the homogeneity of the distribution of all elements in the rock matrix. The mineralogical structure of the rock, as well as the fact that uranium and thorium-rich minerals are often concentrated close to the fracture zones and microfissures, plays an important role in the mechanism of neutron production yields and possibly in the production of {sup 239}Pu. Nevertheless, even this simplified approach is helpful in estimating the production rates of interesting nuclides. Refs, figs and tabs.}
place = {IAEA}
year = {1991}
month = {Sep}
}