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Cesium Sorption on Tonalite and Mica Gneiss

Published online by Cambridge University Press:  10 February 2011

M. Siitari-Kauppi ,
P. Hölttä ,
S. Pinnioja  and
A. Lindberg
M. Siitari-Kauppi
Affiliation:
University of Helsinki, Department of Chemistry, Laboratory of Radiochemistry, P.O.Box 55, FIN-00014 University of Helsinki, Finland.
P. Hölttä
Affiliation:
University of Helsinki, Department of Chemistry, Laboratory of Radiochemistry, P.O.Box 55, FIN-00014 University of Helsinki, Finland.
S. Pinnioja
Affiliation:
University of Helsinki, Department of Chemistry, Laboratory of Radiochemistry, P.O.Box 55, FIN-00014 University of Helsinki, Finland.
A. Lindberg
Affiliation:
Geological Survey of Finland, Kivimiehentie 1, FIN-02150 Espoo, Finland.
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Abstract

Different approaches for measuring the interaction between radionuclides and rock matrix are needed to test the compatibility of transport models and retardation experiments. In this work sorption of cesium (134Cs) was studied on unaltered mica gneiss, and on unaltered, moderately altered and strongly altered tonalite. The crushed rock samples were sieved into seven fractions from 0. 1 mm to 3.15 mm. The mass distribution ratio values for each fraction was determined using the static batch method. Cesium sorption onto different minerals was demonstrated using digital image analysis in order to interpret thin section autoradiographs. The autoradiographic method based on irradiation-induced luminescence properties in feldspars was applied in order to estimate the alteration of tonalites.

Cesium sorption on moderately altered and strongly altered tonalite was stronger than on unaltered rocks owing to larger specific surface areas and the composition of alteration minerals. Strongest sorption was found on biotite. Mass distribution ratio, Rd, values of 0.3–1.1 m3·kg−1 for unaltered rocks and 0.9–3.4 m3·kg−1 for altered rocks were determined. Moderate dependence on surface area was found for mica gneiss after I and 3 days sorption time. For strongly altered tonalite only slight dependence on surface area was found. Research-articled -values increased as a function of sorption time due to diffusion into the particles. Higher increase in values for larger diameter particles indicated the availability of internal specific surface areas.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 1099
Copyright
Copyright © Materials Research Society 1999

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References

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