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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 ,
Shinichi Higuchi ,
Masamichi Obata ,
Tomofumi Sakuragi ,
Ryota Takahashi  and
Hitoshi Owada
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.

Keywords

waste managementpackagingI
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1518: Symposium LL – Scientific Basis for Nuclear Waste Management XXXVI , 2012 , pp. 85 - 90
Copyright
Copyright © Materials Research Society 2013 

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References

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