Structural investigation of coprecipitation of technetium-99 with iron phases

Abstract : Technetium is a long-lived product of nuclear fission which commonly exhibits two oxidation states (IV and VII). Siderite (FeCO3), suspected to be formed as a container corrosion product in geological radioactive waste repositories, may concentrate by coprecipitation more than 90% of technetium-99, present as Tc(IV) in surrounding aqueous fluids. X-ray diffraction and transmission electron microscopy measurements indicate that technetium can be incorporated within the siderite structure, even if we note that technetium-bearing green rust phase may also be observed. These results suggest that siderite might play a beneficial role in limiting Tc diffusion to the next environment of nuclear waste repositories.
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Submitted on : Friday, December 12, 2008 - 1:56:33 PM
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I. Alliot Llorens, Philippe Deniard, E. Gautron, A. Olicard, M. Fattahi, et al.. Structural investigation of coprecipitation of technetium-99 with iron phases. Radiochimica Acta, R Oldenbourg Verlag GMBH, 2008, 96, pp.569-574. ⟨10.1524/ract.2008.1538⟩. ⟨in2p3-00346851⟩

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