ALTERATION OF U(VI)-PHASES UNDER OXIDIZING CONDITIONS | Zendy

Artur P. Deditius | Zendy; Satoshi Utsunomiya | Zendy; Rodney C. Ewing | Zendy

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ALTERATION OF U(VI)-PHASES UNDER OXIDIZING CONDITIONS

Author(s) -

Artur P. Deditius,

Satoshi Utsunomiya,

Rodney C. Ewing

Publication year - 2006

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/884959

Subject(s) - uranium , oxidizing agent , chemistry , radionuclide , spent nuclear fuel , uranium oxide , natural uranium , radiochemistry , mineralogy , environmental chemistry , materials science , nuclear chemistry , metallurgy , nuclear physics , physics , organic chemistry

Uranium-(VI) phases are the primary alteration products of the UO{sub 2} in spent nuclear fuel and the UO{sub 2+x}, in natural uranium deposits. The U(VI)-phases generally form sheet structures of edge-sharing UO{sub 2}{sup 2+} polyhedra. The complexity of these structures offers numerous possibilities for coupled-substitutions of trace metals and radionuclides. The incorporation of radionuclides into U(VI)-structures provides a potential barrier to their release and transport in a geologic repository that experiences oxidizing conditions. In this study, we have used natural samples of UO{sub 2+x}, to study the U(VI)-phases that form during alteration and to determine the fate of the associated trace elements

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