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Fluorescent L-radiation and the. gamma. -radiation of ionium

Journal Article:

Abstract

Irene Curie, Compt. rend. 227, 1225(1948), has shown that the ..gamma..-radiation of ionium is accompanied by a soft radiation that can be identified with the fluorescent L-lines of radium. The present author submitted these radiations to a further study, using as a source a ionium--thorium mixture, (100 mg of hydrate), containing 9% ionium. The Geiger--Mueller counters had 5 mg/cm/sup 2/ aluminum ends and were filled with alcohol + xenon at 10-21 cm Hg. The absorption curves in Cu, Mo, and Ag showed that the energy of the soft radiation was about 14 keV. For the separation of lines, the selective absorption was determined in elements from Z = 28 to Z = 53. The results confirmed the attribution of the spectrum to the L-radiation of Ra. Similar measurements on radioactinium revealed the same lines with approximately the same intensities. In both cases a radium isotope is formed: /sub 90/Th/sup 230/(Io) ..-->.. /sub 88/Ra/sup 226/ ..-->.. ..cap alpha.., /sub 90/Th/sup 227/ (RaAc) ..-->.. /sub 88/Ra/sup 223/ (AcX) + ..cap alpha... The identity of the spectra shows that the atomic number of the formed atom alone determines the L-spectrum, and that in both cases the L level is excited as a result  More>>
Authors:
Publication Date:
Feb 21, 1949
Product Type:
Journal Article
Reference Number:
EDB-79-114638
Resource Relation:
Journal Name: C. R. Hebd. Seances Acad. Sci.; (France); Journal Volume: 228; Other Information: In NSA; 3: 1166(1949)
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; RADIUM; X-RAY SPECTRA; THORIUM 227; ALPHA DECAY; THORIUM 230; L SHELL; GAMMA SPECTRA; RADIUM 223; RADIUM 226; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALKALINE EARTH ISOTOPES; ALKALINE EARTH METALS; ALPHA DECAY RADIOISOTOPES; DAYS LIVING RADIOISOTOPES; DECAY; ELECTRONIC STRUCTURE; ELEMENTS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI; ISOTOPES; METALS; NUCLEI; RADIOISOTOPES; RADIUM ISOTOPES; SPECTRA; THORIUM ISOTOPES; YEARS LIVING RADIOISOTOPES; 652022* - Nuclear Properties & Reactions, A=220 & above, Experimental- Radioactive Decay- (-1987); 640302 - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
OSTI ID:
5923029
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Journal ID: CODEN: COREA
Submitting Site:
TIC
Size:
Pages: 678-680
Announcement Date:

Journal Article:

Citation Formats

Riou, M. Fluorescent L-radiation and the. gamma. -radiation of ionium. France: N. p., 1949. Web.
Riou, M. Fluorescent L-radiation and the. gamma. -radiation of ionium. France.
Riou, M. 1949. "Fluorescent L-radiation and the. gamma. -radiation of ionium." France.
@misc{etde_5923029,
title = {Fluorescent L-radiation and the. gamma. -radiation of ionium}
author = {Riou, M}
abstractNote = {Irene Curie, Compt. rend. 227, 1225(1948), has shown that the ..gamma..-radiation of ionium is accompanied by a soft radiation that can be identified with the fluorescent L-lines of radium. The present author submitted these radiations to a further study, using as a source a ionium--thorium mixture, (100 mg of hydrate), containing 9% ionium. The Geiger--Mueller counters had 5 mg/cm/sup 2/ aluminum ends and were filled with alcohol + xenon at 10-21 cm Hg. The absorption curves in Cu, Mo, and Ag showed that the energy of the soft radiation was about 14 keV. For the separation of lines, the selective absorption was determined in elements from Z = 28 to Z = 53. The results confirmed the attribution of the spectrum to the L-radiation of Ra. Similar measurements on radioactinium revealed the same lines with approximately the same intensities. In both cases a radium isotope is formed: /sub 90/Th/sup 230/(Io) ..-->.. /sub 88/Ra/sup 226/ ..-->.. ..cap alpha.., /sub 90/Th/sup 227/ (RaAc) ..-->.. /sub 88/Ra/sup 223/ (AcX) + ..cap alpha... The identity of the spectra shows that the atomic number of the formed atom alone determines the L-spectrum, and that in both cases the L level is excited as a result of an internal conversion of ..gamma..-lines: the line 68 keV in the case of ionium, eight lines 26-100 keV in that of radioactinium. On the basis of the intensities found, the relative numbers of photons corresponding to the levels L/sub I/, L/sub II/, and L/sub III/ could be calculated; they are L/sub I/:L/sub II/:L/sub III/ = 50:20:26. The ..gamma..-rays of ionium, as determined from the absorption in Cu, Ta, and Pb, are 68 and 200 kev. By assuming that the efficiency of the counters is equal to 1 - exp (-m..mu../rho), (where m is the efficient superficial mass of xenon, and ..mu../rho is the absorption coefficient in xenon), the intensities of the L- and ..gamma..-radiations of ionium can be given in terms of numbers of quanta per 100 disintegrations.}
journal = {C. R. Hebd. Seances Acad. Sci.; (France)}
volume = {228}
journal type = {AC}
place = {France}
year = {1949}
month = {Feb}
}