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The Dependence of the Diffusion Coefficients of 3H and Cs on Grain Size in Compacted Montmorillonite

Published online by Cambridge University Press:  10 February 2011

Mamoru Nakajima ,
Tamotsu Kozaki ,
Hiroyasu Kato ,
Seichi Sato  and
Hiroshi Ohashi
Mamoru Nakajima
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan
Tamotsu Kozaki
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan
Hiroyasu Kato
Affiliation:
Naka Energy Research Center, Mitsubishi Materials Corporation, 1002-14, Mukoyama, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan
Seichi Sato
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan
Hiroshi Ohashi
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan
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Abstract

Compacted bentonite is a candidate buffer material in geological disposal of high-level radioactive waste. The transport of radionuclides in compacted bentonite is dominated by diffusion, because of its very low permeability. In this study, we focused on the grain size of clay mineral, which is considered to be closely related to the formation factor in the pore water diffusion model[1,2]. The apparent diffusion coefficients (Da) of HTO and cesium ions in compacted clays were determined using montmorillonite samples with different grain size and dry density, and the effect of the grain size on diffusion behavior was discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 947
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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