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Tc and Re Behavior in Borosilicate Waste Glass Vapor Hydration Tests

Published online by Cambridge University Press:  19 October 2011

David A. McKeown
Affiliation:
davidm@vsl.cua.edu, Catholic University of America, Vitreous State Laboratory, 620 Michigan Ave., N.E., Washington, DC, 20064, United States, (202) 319-5226, (202) 319-4469
Andrew C. Buechele
Affiliation:
Andrewb@vsl.cua.edu, Catholic University of America, Vitreous State Laboratory, 620 Michigan Ave., N.E., Washington, DC, 20064, United States
Wayne W. Lukens
Affiliation:
wwlukens@lbl.gov, Lawrence Berkeley National Laboratory, Actinide Chemistry Group, Berkeley, CA, 94720, United States
David K. Shuh
Affiliation:
dkshuh@lbl.gov, Lawrence Berkeley National Laboratory, Actinide Chemistry Group, Berkeley, CA, 94720, United States
Ian L. Pegg
Affiliation:
ianp@vsl.cua.edu, Catholic University of America, Vitreous State Laboratory, 620 Michigan Ave., N.E., Washington, DC, 20064, United States
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Abstract

Technetium (Tc), found in some nuclear wastes, is of particular concern with regard to long-term storage, because of its long-lived radioactivity and high mobility in the environment. Tc and rhenium (Re), commonly used as a non-radioactive surrogate for Tc, were studied to assess their behavior in borosilicate glass under hydrothermal conditions in the Vapor Hydration Test (VHT). X-ray absorption spectroscopy (XAS) and scanning electron microscopy (SEM) measurements were made on the original Tc- and Re-containing glasses and their corresponding VHT samples, and show different behavior for Tc and Re under VHT conditions. XAS indicates that, despite starting with different Tc(IV) and Tc(VII) distributions in each glass, the VHT samples have 100% Tc(IV)O6 environments. SEM shows complete alteration of the original glass, Tc enrichment near the sample surface, and Tc depletion in the center. Perrhenate (Re(VII)O4 ) is dominant in both Re-containing samples before and after the VHT, where Re is depleted near the VHT sample surface and more concentrated toward the center.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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