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Radiolytic Gas Generation in Chemically-bonded Iron Phosphate Ceramic Forms used for Immobilization of Plutonium Ash Residues

Published online by Cambridge University Press:  10 February 2011

Albert S. Aloy ,
T.I. Kolycheva ,
D. A. Knecht  and
Y. Macheret
Albert S. Aloy
Affiliation:
V. G. Khlopin Radium Institute, 2-nd Murinskiy Ave., St. Petersburg, 194021, Russia
T.I. Kolycheva
Affiliation:
V. G. Khlopin Radium Institute, 2-nd Murinskiy Ave., St. Petersburg, 194021, Russia
D. A. Knecht
Affiliation:
Idaho National Engineering and Environmental Laboratory, LMITCO, P.O. Box 1625 Idaho Falls, ID 83415
Y. Macheret
Affiliation:
Idaho National Engineering and Environmental Laboratory, LMITCO, P.O. Box 1625 Idaho Falls, ID 83415
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Abstract

Iron phosphate ceramic (IPC) samples were prepared with plutonium-238, and radiolytic gas generation was detennined for exposure times of up to 195 days. The specific activity of the synthesized IPC samples was 1.91 mCi/g. The composition of the generated gases was determined to contain mainly H, and lower amounts of O2, CO2 and CO. The molecular hydrogen G value (molecules of H2 per 100 eV absorbed dose) depended on the sample preparation methodology, ranging from 0.07 at 79 days for sample IPC-2 to 0.34 at 119 days for sample IPC-1. This difference could be due to different total amount (wt.%) of free water resulting in sample preparation. The leach rate data for radioactive and non-radioactive IPC samples obtained by the ANSI/ANS 16.1 procedure resulted in Leachability Indexes of 13.7 for Pu and 15.4 for Ce, above the NRC LLW acceptance minimum index of 6.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 1207
Copyright
Copyright © Materials Research Society 1999

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References

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