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Radionuclide Migration Studies on Tonalite

Published online by Cambridge University Press:  01 January 1992

P. HÖlttÄ ,
M. Siitari-KAUPPI ,
M. Hakanen  and
A. HautojÄrvi
P. HÖlttÄ
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
M. Siitari-KAUPPI
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
M. Hakanen
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
A. HautojÄrvi
Affiliation:
Technical Research Centre of Finland, Nuclear Engineering Laboratory, P.O. Box 208, SF-02151 Espoo, Finland
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Abstract

Migration of water, chloride, sodium, and calcium in tonalite was studied, using dynamic column and static through-diffusion methods. Autoradiography of rocks impregnated with 14C-methylmethacrylate was introduced in order to determine the spatial porosity distribution, as well as to identify and visualize the migration pathways of non-sorbing radionuclides in tonalite matrix at the mm-cm scale. The migration routes of sorbing radionuclides and the sorptive minerals in tonalite were determined by autoradiographic methods, using 45Ca as a tracer. Transport of radionuclides was interpreted, using models for hydrodynamic dispersion with diffusion into the rock matrix. In tonalite, porous minerals were distributed homogeneously in matrix and, therefore, retardation capacity of the rock matrix was found to be high.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 803
Copyright
Copyright © Materials Research Society 1993

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References

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