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Separation of fission products by the use of recoil; Separation des produits de fission par utilisation du recul

Abstract

We have studied fission recoil in U{sub 3}O{sub 8} organic solvent mixtures. The organic phase chosen was first naphtalene then terphenyl. Graphite and activated carbon were also tried out as recoil media. We first verified that the fission fragments are ejected from the uranium oxide particles under our experimental conditions. The retention phenomenon observed is due to an adsorption occurring either during irradiation or during the chemical treatment. Using naphthalene or terphenyl, the individual separation of the fission products has made it possible to show the influence of the chemical nature of the recoil medium on the retention of each fission product. We put forward a hypothesis concerning this phenomenon: experiments carried out using 'scavengers', together with kinetic studies make it possible to explain the retention phenomenon and to choose the most favorable conditions for reducing this retention to a low value. The thermal recombination kinetics demonstrate the influence of the fission ion charge on the final value of the retention for a given temperature. The origins of this thermal recombination are discussed. (author) [French] On a etudie le recul de fission dans les melanges U{sub 3}0{sub 8}, phase organique. La phase organique choisie a ete le naphtalene puis le  More>>
Authors:
Henry, R; Beydon, J; Bardy, A [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1960
Product Type:
Technical Report
Report Number:
CEA-R-1758
Resource Relation:
Conference: Symposium on chemical effects of nuclear transformations, Colloque sur les effets chimiques des transformations nucleaires, Prague (Czech Republic), 24-27 Oct 1960; Other Information: 5 refs
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; ACTIVATED CARBON; ADSORPTION; COMPARATIVE EVALUATIONS; FISSION FRAGMENT DETECTION; FISSION FRAGMENTS; FISSION PRODUCTS; GAMMA DETECTION; GRAPHITE; HOT ATOM CHEMISTRY; IRON CHLORIDES; IRRADIATION; NAPHTHALENE; RECOILS; RETENTION; SCAVENGING; TERPHENYLS; TIME DEPENDENCE; URANIUM OXIDES U3O8
OSTI ID:
20967969
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R1758116754
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
23 pages
Announcement Date:
Dec 29, 2007

Citation Formats

Henry, R, Beydon, J, and Bardy, A. Separation of fission products by the use of recoil; Separation des produits de fission par utilisation du recul. France: N. p., 1960. Web.
Henry, R, Beydon, J, & Bardy, A. Separation of fission products by the use of recoil; Separation des produits de fission par utilisation du recul. France.
Henry, R, Beydon, J, and Bardy, A. 1960. "Separation of fission products by the use of recoil; Separation des produits de fission par utilisation du recul." France.
@misc{etde_20967969,
title = {Separation of fission products by the use of recoil; Separation des produits de fission par utilisation du recul}
author = {Henry, R, Beydon, J, and Bardy, A}
abstractNote = {We have studied fission recoil in U{sub 3}O{sub 8} organic solvent mixtures. The organic phase chosen was first naphtalene then terphenyl. Graphite and activated carbon were also tried out as recoil media. We first verified that the fission fragments are ejected from the uranium oxide particles under our experimental conditions. The retention phenomenon observed is due to an adsorption occurring either during irradiation or during the chemical treatment. Using naphthalene or terphenyl, the individual separation of the fission products has made it possible to show the influence of the chemical nature of the recoil medium on the retention of each fission product. We put forward a hypothesis concerning this phenomenon: experiments carried out using 'scavengers', together with kinetic studies make it possible to explain the retention phenomenon and to choose the most favorable conditions for reducing this retention to a low value. The thermal recombination kinetics demonstrate the influence of the fission ion charge on the final value of the retention for a given temperature. The origins of this thermal recombination are discussed. (author) [French] On a etudie le recul de fission dans les melanges U{sub 3}0{sub 8}, phase organique. La phase organique choisie a ete le naphtalene puis le terphenyle. Le graphite et le charbon actif ont egalement ete essayes comme milieux de recul. On a d'abord determine que les fragments de fission sortent des particules d'oxyde d'uranium avec un rendement de 100 pour cent dans nos conditions experimentales. Le phenomene de retention observe est du a une adsorption ayant lieu pendant l'irradiation ou pendant le traitement chimique. Dans le naphtalene et le terphenyle, la separation individuelle des produits de fission a permis de mettre en evidence l'influence de la nature chimique du milieu de recul sur la retention de chaque produit de fission. On avance une hypothese sur ce phenomene: des experiences effectuees avec des 'scavengers', et des essais cinetiques permettent d'expliquer le phenomene de retention et de choisir les conditions les meilleures pour diminuer cette retention jusqu'a une faible valeur. La cinetique de recombinaison thermique fait apparaitre l'influence de la charge de l'ion de fission sur la valeur finale de la retention pour une temperature donnee. L'origine de cette recombinaison thermique est discutee. (auteur)}
place = {France}
year = {1960}
month = {Jul}
}