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Radionuclide Incorporation in Secondary Crystalline Minerals from Chemical Weathering of Waste Glasses

Published online by Cambridge University Press:  21 March 2011

Shas V. Mattigod ,
R. Jeff. Serne ,
Bernard P. McGrail  and
Virginia L. LeGore
Shas V. Mattigod
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352. U.S.A.
R. Jeff. Serne
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352. U.S.A.
Bernard P. McGrail
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352. U.S.A.
Virginia L. LeGore
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352. U.S.A.
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Abstract

Data from corrosion and radionuclide sequestration studies on two waste glasses indicated chemical weathering resulted in the formation of zeolite minerals such as herschelite and analcime. We also found that these minerals incorporated ∼8 – 22%, ∼1- 13% and ∼8 – 25% of spiked 125I, 99Tc, and 75Se respectively. Increasing concentrations of radionuclides in spike solution resulted in higher degree of sequestration as observed by significantly higher proportion of stable isotopes (∼70 – 95% I, ∼58 – 100% Re, and ∼100% Se) in secondary minerals. The radionuclide incorporation mechanisms for these minerals appear to be mainly isomorphic substitution of Se and Re in tetrahedral sites and iodide substitution for framework oxygen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ5.1
Copyright
Copyright © Materials Research Society 2002

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References

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