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A study on Iodine Release Behavior from Iodine-Immobilizing Cement Solid

Published online by Cambridge University Press:  23 January 2013

Yoshiko Haruguchi
Affiliation:
TOSHIBA Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki, Japan
Shinichi Higuchi
Affiliation:
TOSHIBA Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki, Japan
Masamichi Obata
Affiliation:
TOSHIBA Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki, Japan
Tomofumi Sakuragi
Affiliation:
Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo, Japan
Ryota Takahashi
Affiliation:
Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo, Japan
Hitoshi Owada
Affiliation:
Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo, Japan
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Abstract

An iodine-immobilizing cement solidification process using calcium aluminate cement with gypsum additive was developed. Powdered cement solid was repeatedly immersed in ion-exchanged water with varying liquid-to-solid ratios (L/S) in accelerated dissolution tests simulating interaction with groundwater at waste disposal sites. The measured concentrations of iodine in the water were on the order of 10−5 to 10−3 mol⋅dm−3 in the entire L/S range. These concentration levels are extremely low compared with those in the case of ordinary Portland cement. Calculations with a solution equilibrium model for the cement immersed in ion-exchanged water showed that the observed iodine release profile versus integrated L/S ratio from the immersion test was explained by a dissolution model of minerals in the cement.

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Articles
Copyright
Copyright © Materials Research Society 2013 

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References

FEPC and JAEA, “Second Progress Report on Research and Development for TRU Waste Disposal in Japan”, Repository Design, Safety Assessment Means of Implementation in the Generic Phase (2007).
Tomita, F., et al. ., “Development of Iodine Immobilization Process with Cementitious Materials”, ICEM 99 (1999).Google Scholar
Suzuki, K., et al. ., Concrete Research and Technology, vol. 1(2), p39- (1990), (in Japanese).CrossRef
Parkhurst, D. L. and Appelo, C. A. J., “User's Guide to PHREEQC (VERSION2),US. Geological Survey, (1999).Google Scholar
JNC TN8400, 2005-010, “Development of Thermodynamic Database for Hyperalkaline, Argillaceous Systems, ” July 2005.

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