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The Effect of Ground Water - Rock Interactions on the Migration of Redox Sensitive Radionuclides

Published online by Cambridge University Press:  26 February 2011

Seija Suksi ,
M. Siitari-Kauppi ,
E-L. Kämäräinen  and
A. Lindberg
Seija Suksi
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
E-L. Kämäräinen
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

Interactions of redox sensitive elements with common Finnish rocks were studied in the laboratory under oxic and anoxic conditions. Sorption and diffusion of technetium, uranium, plutonium and neptunium were studied in drill cores of granites and gneiss. Cylindrical drill core cup samples and plane surfaces sawed from drill cores were exposed for periods from six to eighteen months to synthetic ground water to which Tc-99, U-233, Pu-236 or Np-237 had been added. Identification of the sorption and the diffusion pathways were discovered by qualitative autora-diography. The concentrations of elements versus depth in the drill core were measured radiometrically, by quantitative autoradio-graphy or by both methods. The migration of plutonium was slow in all samples. Technetium, uranium and neptunium were transported effectively under both oxic and anoxic conditions. Transported species of these elements were found throughout the rock matrices investigated - in microfissures, along mineral grain boundaries and in the minerals themselves. The ranges of the measured apparent diffusivities for neptunium were (2.7 – 30) × 10−14 m2/s under oxic conditions and (1.4 – 4.3) × 10−14 m2/s under anoxic conditions. For uranium the range of Da-values under oxic conditions was (3.6 – 5.7) × 10−14 m2/s under anoxic conditions it was (1.1 × 4.3) × 10−14 m2/s in granitic ground water and (1.8 – 5.3) × 10−14 m2/s in bentonite water.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 965
Copyright
Copyright © Materials Research Society 1989

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References

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