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Analysis of Uranium Oxide Weathering by Molecular Spectroscopy
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A preliminary study of the weathering of uranium oxide particles diluted in diamond dust at ambient environmental conditions is presented. The primary weathering reaction is oxidation of the uranium from the +4 to +6 oxidation state, although formation of compounds such as carbonates and hydroxides is possible. Identification of the state of uranium oxides has been attempted using luminescence spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Luminescence spectra of nominal samples of three common oxides, UO3, U3O8, and UO2, have been measured showing significant spectral differences in peaks at 494 nm, 507 nm, 529 nm, and 553 nm. DRIFTS spectra of the same three oxides show significant differences in peaks at 960 cmżą, 856 cmżą, and 756 cmżą. The differences in these peaks will allow determination of the oxidation to the +6 state in these compounds.
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