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U and Nd Isotopes from the New Oklo Reactor 10 (GABON): Evidence for Radioelements Migration

Published online by Cambridge University Press:  25 February 2011

C. Hemond ,
C. Menet  and
M.T. Menager
C. Hemond
Affiliation:
MPI fur Chemie, Abteilung Geochemie, Postfach 3060, 6500 MAINZ, Germany
C. Menet
Affiliation:
CEA SCS/SGC/LECALT CEN-FAR BP6 92265 FONTENAY-AUX-ROSES CEDIE, FRANCE
M.T. Menager
Affiliation:
CEA SCS/SGC/LECALT CEN-FAR BP6 92265 FONTENAY-AUX-ROSES CEDIE, FRANCE
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Abstract

New isotopic data on daughters of transuranium elements and fission products from the Oklo reactor 10 and its surrounding provide evidences of Nd and U migrations. Whereas Nd was released only along carbonated fissures (NdFp as high as 1.048 in the fissures compared to 1.007 in the neighbouring sandstone), U has migrated through the sandstone as well (abnormal negative 235U anomalies as low as 0.714 in both fissures and surrounding sandstone). Nevertheless the released amount of radioelements is very small and visible in the drop of the concentrations between the reactor and the surrounding sandstone [8]. As consequence, a retention effect is evidenced at the reactor-sandstone boundary.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 489
Copyright
Copyright © Materials Research Society 1992

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References

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