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Illite in the Oklo Natural Fission Reactors in Gabon: Considerations for Cs Containment
Published online by Cambridge University Press: 15 February 2011
Abstract
The ∼2 Ga old Oklo, Okelobondo and Bangombé natural reactors in the Republic of Gabon contain solid graphitic bitumens and clay minerals, both of which have effected the containment, or partial containment, of 235U and several fission products. In laboratory experiments, sorption of 134Cs by illite, and illite coated with petroleum was measured in aqueous NaCl solutions to simulate subsurface (connate) waters in sedimentary rocks. Elevated temperatures and increasing salinity of the NaCl solutions facilitated the removal of sorbed cesium from illite.
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