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Uranium Speciation in Glass Corrosion Layers: an XAFS Study

Published online by Cambridge University Press:  03 September 2012

Bruce M. Biwer ,
L. Soderholm ,
R. B. Greegort  and
F. W. Lytle
Bruce M. Biwer
Affiliation:
Argonne National Laboratory, Argonne IL 60439
L. Soderholm
Affiliation:
Argonne National Laboratory, Argonne IL 60439
R. B. Greegort
Affiliation:
The Boeing Company, Seattle, WA 98124 and
F. W. Lytle
Affiliation:
The EXAFS Company, Pioche, NV 89043
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 229
Copyright
Copyright © Materials Research Society 1997

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