このエントリーをはてなブックマークに追加
ID 25982
本文ファイル
著者
Gauthier-Lafaye, François
NDC
地球科学・地学・地質学
抄録(英)
Ba isotopic studies of the Oklo and Bangombe natural fission reactors in east Gabon provide information on the geochemical behavior of radioactive Cs (135Cs and 137Cs) in a geological medium. Large isotopic deviations derived from fissiogenic Ba were found in chemical leachates of the reactor uraninites. The fissiogenic Ba isotopic patterns calculated by subtracting the non-fissiogenic component are classified into three types that show different magnifications of chemical fractionation between Cs and Ba. In addition, the isotopic signatures of fissiogenic 135Ba, 137Ba and 138Ba suggest an early differentiation between Cs and Ba of less than 20 years after the production of fissiogenic Cs and Ba. On the other hand, only small excesses of 135Ba (ε<+1.8) and/or 137Ba (ε<+1.3) were identified in some clay samples, which might have resulted from selective adsorption of 135Cs and 137Cs that migrated from the reactors by differentiation.
掲載誌名
Geochimica et Cosmochimica Acta
72巻
16号
開始ページ
4123
終了ページ
4135
出版年月日
2008-08-15
出版者
Pergamon
Elsevier Science Ltd.
ISSN
0016-7037
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2008 Elsevier Ltd
関連情報URL
部局名
理学研究科