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Diffusion of Radionuclides in Compacted Bentonite : Results from Combined Glass Dissolution and Migration Tests

Published online by Cambridge University Press:  15 February 2011

Masaki Tsukamoto
Affiliation:
Central Research Institute of Electric Power Industry, 2–11–1 Iwado-Kita, Komae, Tokyo 201, Japan
T. Ohe
Affiliation:
Central Research Institute of Electric Power Industry, 2–11–1 Iwado-Kita, Komae, Tokyo 201, Japan
T. Fujita
Affiliation:
Central Research Institute of Electric Power Industry, 2–11–1 Iwado-Kita, Komae, Tokyo 201, Japan
R. HesbÖl
Affiliation:
Studsvik Radwaste AB, S-611 82 Nyköping, Sweden
H-P. Hermansson
Affiliation:
Studsvik Material AB, S-611 82 Nyköping, Sweden
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Abstract

Diffusion experiments of radionuclides in compacted sodium bentonite with a dry density of 1.0 g/cm3 were performed in nitrogen gas atmosphere at 90 °C for 208 d and 375 d. The corrosion experiments of crushed radioactive glass, JSS-A, carried out simultaneously to provide the source of the radionuclides for the diffusion experiments. The normalized elemental mass losses of cesium isotopes and 238Pu were lower than those of boron (ca. 10 g/m2) probably because of the difference of sorption and/or precipitation. The apparent diffusion coefficients of 238Pu, 234U and 125Sb were determined to be 2x 10-14 m2/s, 5x 10-12 m2/s and 2x 10-12 m2/s, respectively. The distribution coefficient of Pu estimated from the diffusion data was of the same order as that from batch sorption experiments. The glass corrosion and the plutonium diffusion were described by the geochemical codes PHREEQE, STRAG4 and GESPER. The calculation results well fitted the observed data.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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