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Uranium Speciation in Glass Corrosion Layers: an XAFS Study

  • Bruce M. Biwer (a1), L. Soderholm (a1), R. B. Greegort (a2) and F. W. Lytle (a3)


Uranium L3 X-ray absorption data were obtained from two borosilicate glasses, which are considered as models for radioactive wasteforms, both before and after leaching. Surface sensitivity to uranium speciation was attained by a novel application of simultaneous fluorescence and electron-yield detection. Changes in speciation are clearly discernible, from U(VI) in the bulk to (UO2)2+-uranyl in the corrosion layer. The uranium concentrations within the corrosion layer also show variations with leaching times that can be determined from the data.



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