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Solution-Borne Colloids from Drip Tests using actinide-Doped and Fully-Radioactive Waste Glasses

Published online by Cambridge University Press:  03 September 2012

Jeffrey A. Fortner ,
Stephen F. Wolf ,
Edgar C. Buck ,
Carol J. Mertz  and
John K. Bates
Jeffrey A. Fortner
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, USA.
Stephen F. Wolf
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, USA.
Edgar C. Buck
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, USA.
Carol J. Mertz
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, USA.
John K. Bates
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, USA.
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Abstract

Drip tests designed to replicate the synergistic interactions between waste glass, repository groundwater, water vapor, and sensitized 304L stainless steel in the potential Yucca Mountain Repository have been ongoing in our laboratory for over ten years. Results will be presented from three sets of these drip tests: two with actinide-doped glasses, and one with a fully-radioactive glass. Periodic sampling of these tests have revealed trends in actinide release behavior that are consistent with their entrainment in colloidal material when as-cast glass is reacted. Results from vapor hydrated glass show that initially the actinides are completely dissolved in solution, but as the reaction proceeds, the actinides become suspended in solution. Sequential filtering and alpha spectroscopy of colloid-bearing leachate solutions indicate that more than 80% of the plutonium and americium are bound to particles that are captured by a 0.1 μm filter, while less than 10% of the neptunium is stopped by a 0.1 μm filter. Analytical transmission electron microscopy has been used to examine particles from leachate solutions and to identify several actinide-bearing phases which are responsible for the majority of actinide release during glass corrosion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 165
Copyright
Copyright © Materials Research Society 1997

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References

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