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Sorption and Diffusion of Radionuclides in Rock Matrix and Natural Fracture Surfaces Studied by Autoradiography

Published online by Cambridge University Press:  28 February 2011

S. Muuronen ,
E-L. Kämäräinen ,
T. Jaakkola ,
S. Pinnioja  and
A. Lindberg
S. Muuronen
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
E-L. Kämäräinen
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
T. Jaakkola
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
S. Pinnioja
Affiliation:
University of Helsinki, Department of Radiochemistry, Unioninkatu 35, SF-00170 Helsinki, Finland
A. Lindberg
Affiliation:
Geological Survey of Finland, Kivimiehentie 1, SF-02150 Espoo, Finland
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Abstract

A method based on autoradiography was developed to determine the sorption and diffusion of cesium, strontium, cobalt, nickel, iodine and americium into rock matrix. Samples chosen for this study were filled and unfilled natural fracture surfaces and drill cores having a central drilled hole (”). Rock types were mica gneiss, tonalite and rapakivi granite, which were selected to represent the common rocks and minerals in Finnish bedrock. Distribution coefficients (Ka-values) of cesium and strontium determined for fissure surfaces and drill core cups were of the same order of magnitude. After three months contact time the greatest penetration depth for cesium was 2.5 mm, for a natural fissure surface sample of rapakivi granite. For strontium the penetration depths of 11 mm in three months and 35 mm in twelve months were found for filled natural fissure surface samples of rapakivi granite. The range of Da-values was 1.5 × 10−15 - 3.2 × 10−14 m2/s and 1.4 × 10−14 - 2.1 × 10−13 m2/s for cesium and strontium, resp. For cobalt the Da-values of 5 × 1016 m2/s in tonalite was obtained. In six months the penetration depths of nickel, iodine and americium were too low (< 0.5 mm) to allow calculation of Da.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 747
Copyright
Copyright © Materials Research Society 1985

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References

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