Ba isotopic signature for early differentiation between Cs and Ba in natural fission reactors
Geochimica et Cosmochimica Acta Volume 72 Issue 16
Page 4123-4135
published_at 2008-08-15
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| File | |
| Title ( eng ) |
Ba isotopic signature for early differentiation between Cs and Ba in natural fission reactors
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| Creator |
Gauthier-Lafaye François
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| Source Title |
Geochimica et Cosmochimica Acta
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| Volume | 72 |
| Issue | 16 |
| Start Page | 4123 |
| End Page | 4135 |
| Abstract |
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.
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| NDC |
Earth sciences. Geology [ 450 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
Pergamon
Elsevier Science Ltd.
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| Date of Issued | 2008-08-15 |
| Rights |
Copyright (c) 2008 Elsevier Ltd
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| Publish Type | Author’s Original |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0016-7037
[DOI] 10.1016/j.gca.2008.06.005
[NCID] AA00655038
[DOI] http://dx.doi.org/10.1016/j.gca.2008.06.005
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