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Thermodynamic Modeling and Sensitivity Analysis of Kd Values for Radionuclide Migration in Sedimentary Host Rocks

Published online by Cambridge University Press:  01 February 2011

Caterina Talerico
Affiliation:
BMG Engineering Ltd., Ifangstrasse 11, CH-8952 Schlieren-Zürich, Switzerland
Michael Ochs
Affiliation:
BMG Engineering Ltd., Ifangstrasse 11, CH-8952 Schlieren-Zürich, Switzerland
Shinzo Ueta
Affiliation:
Mitsubishi Materials Corporation (MMTL), Tokyo, Japan
Noriyuki Sasaki
Affiliation:
Japan Nuclear Fuel Ltd. (JNFL), Japan
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Abstract

The effects of key geochemical parameters on Kd values for radionuclides in the host rock (pumice, sandstone) of a LLW repository were elucidated through a sensitivity analysis, using a thermodynamic speciation/sorption model for the elements Sr and Ni. The complex mineral assemblage of the rock was approximated by a component-additivity approach. Using published ion exchange and surface complexation parameters, Kd for both Sr and Ni could be well explained by the same model mineralogy and surface chemistry. Model results suggest that pCO2 can have a significant effect on Kd, and that a correct approximation of groundwater chemistry is a critical component of sorption modeling.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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Thermodynamic Modeling and Sensitivity Analysis of Kd Values for Radionuclide Migration in Sedimentary Host Rocks
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