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Radionuclide Retardation in Crystalline Rock Fractures.

Published online by Cambridge University Press:  15 February 2011

P. HÖlttÄ ,
M. Hakanen ,
M. Siitari-Kauppi  and
A. HautojÄrvi
P. HÖlttÄ
Affiliation:
University of Helsinki, Department of Radiochemistry, P.O.Box 55, F1N-00014 University of Helsinki, Finland
M. Hakanen
Affiliation:
University of Helsinki, Department of Radiochemistry, P.O.Box 55, F1N-00014 University of Helsinki, Finland
M. Siitari-Kauppi
Affiliation:
University of Helsinki, Department of Radiochemistry, P.O.Box 55, F1N-00014 University of Helsinki, Finland
A. HautojÄrvi
Affiliation:
VTT Energy, Nuclear Energy, P.O.Box 1604, FIN-02044 VTT, Finland.
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Abstract

Transport and retardation of slightly sorbing sodium was studied in Syyry area SY-KR7 mica gneiss and in altered porous tonalite. Experiments were performed using dynamic fracture and crushed rock column methods and the static batch method. Flow conditions in the columns were determined using tritiated water and chloride as non-sorbing tracers. 14C-PMMA method was used to study the pore structure of matrices and the surface areas were determined by B.E.T. method. Sodium was retarded strongly in altered tonalite owing to homogeneously porous matrix structure and the composition of alteration minerals. An agreement between retardation values in batch and crushed rock column experiments as well as in fracture column experiments was good.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 355
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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