XPS study of external α-radiolytic oxidation of UO2 in the presence of argon or hydrogen

Hansson, Niklas,1992Chalmers tekniska högskola,Chalmers University of Technology (författare)

UO2 pellets exposed to 1.85 MBq and 3.30 MBq Am-241 sources with a 30 μm separation in solution were studied under Ar and H2 atmospheres. The 1.85 MBq Am-241 source was shown to have a too low radiolytic production to cause any measurable change in UO2 surface oxidation state. However, a significant oxidation was observed after exposure to the 3.30 MBq source under Ar atmosphere through the production of U(V), as seen from the U4f7/2-peak deconvolution and valence band peak analysis. The H2 atmosphere was shown to suppress the oxidation of the UO2 pellet surface as well as the dissolution in both Milli-Q and NaHCO3 solutions. The dissolved uranium concentration was reduced by a factor 10 under H2 atmosphere as compared to the Ar atmosphere experiments.

Tam, Eric,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)erict (författare)
Ekberg, Christian,1967Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)che (författare)
Spahiu, Kastriot,1951Chalmers tekniska högskola,Chalmers University of Technology,Svensk Kärnbränslehantering AB (SKB),Swedish Nuclear Fuel and Waste Management Company (SKB)(Swepub:cth)kastriot (författare)
Chalmers tekniska högskolaSvensk Kärnbränslehantering AB (SKB) (creator_code:org_t)

Av författaren/redakt...: Hansson, Niklas, ...; Tam, Eric, 1980; Ekberg, Christia ...; Spahiu, Kastriot ...

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