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Study on Role of 234Th in Uranium Series Nuclides Migration

Published online by Cambridge University Press:  28 February 2011

Toshihiko Ohnuki ,
Shoji Watanabe  and
Takashi Murakami
Toshihiko Ohnuki
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan
Shoji Watanabe
Affiliation:
Mitsui Knowledge Industry, Tokyo, Japan
Takashi Murakami
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan
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Abstract

The role of 234Th, a daughter nuclide of 238U having a half life of 24 days, in the migration of uranium series nuclides has been studied to understand the mechanism which gives a higher migration velocity of 238U than that of 234U. We assume that 234Th is adsorbed at two different sites; one, where 234Th is reversibly adsorbed, and the other, where 234Th is irreversibly fixed. Calculations have shown that the fixation of ^Th to a rock can cause the apparent migration velocity of 234U to be reduced compared to that of 238U and this agrees with observed field data. Changes in the fixation rate constants affect the relative mobility of 238U and 234U, and this can account for the different migration behavior at different depths in the Koongarra ore deposit.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 733
Copyright
Copyright © Materials Research Society 1991

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References

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