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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

REFERENCES

[1] Ohnuki, T., Murakami, T., Sekine, K., Yanase, N., Isobe, H., Kobayashi, Y., in Scientific Basis for Nuclear Waste Manag. XIII, edited by Obersby, V. M. and Brown, P. W., (Mater. Res. Soc. Proc. 176, Pittsburgh, PA, USA, 1990) p 607.Google Scholar
[2] Lively, R.S., “Uranium Series Disequilibrium In Three Surficial Uranium Deposits”, M.S. Thesis, Michigan. State Univ. USA, 1978.Google Scholar
[3] Lively, R.S., Harmon, R. S., Levinson, A. A., Bland, C. J., J. Geochem. Expl., 12, 57 (1979).Google Scholar
[4] Fleischer, R. L. and Raabe, O. G., Geochim. Cosmochim. Acta 42, 973 (1978).Google Scholar
[5] Eyal, Y. and Fleischer, R. L., Geochim. Cosmochim. Acta 49, 1155 (1965).Google Scholar
[6] Prowse, G. (private communication).Google Scholar
[7] Murakami, T. and Isobe, H. and Edis, R., this volume.Google Scholar
[8] Snelling, A. A., in Proceedings of IAEA International Symposium Uranium in the Pine Creek Geosyncline, edited by Ferguson, J. and Goleby, A. B., (IAEA, Vienna, 1980) p. 487.Google Scholar
[9] Shirvington, P. J., Geochim. Cosmochim. Acta 47, 403 (1983).Google Scholar
[10] Airey, P. L., Chem. Geol. 55, 255 (1986).Google Scholar
[11] Ueno, T., (private communication).Google Scholar
[12] Schwertmann, U. and Murad, E., Clays and Clay Minerals 31, 277 (1983).Google Scholar
[13] Payne, T., in Alligator Rivers Analogue Project 1st Annual Report, edited by Duerden, P., (Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2232, Australia, 1990) p 119.Google Scholar
[14] Yanase, N., Radiochim. Acta (in press).Google Scholar