Competition of surface reactions of tritium release from irradiated Li4Si04 pebbles

Out-of-pile tritium release experiments were performed on Li4SiO4 pebbles produced from lithium hydroxide under various compositions of sweep gas （He, 1.1% H2/He） and environmental moisture conditions. The experimental results indicate that tritium gas can be released directly from ＂dry＂ Li4SiO4 und...

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Bibliographic Details
Published in:中国科学：化学英文版 2015 (5), p.839-844
Main Author: Chunmei Kang Chengjian Xiao Xiaojun Chen Shuming Peng Xiaolin Wang
Format: Article
Language:English
Subjects:
交换反应
同位素
氚气
照射
硅酸锂
竞争
表面反应
鹅卵石
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Summary:Out-of-pile tritium release experiments were performed on Li4SiO4 pebbles produced from lithium hydroxide under various compositions of sweep gas （He, 1.1% H2/He） and environmental moisture conditions. The experimental results indicate that tritium gas can be released directly from ＂dry＂ Li4SiO4 under pure He gas. This phenomenon did not happen on ＂wet＂ samples, which means that the chemical form of released tritium is sensitive to moisture. Adding H2 to sweep gas may increase the overall desorption rate of tritium gas through H2 isotope exchange reaction, which occurs at a lower temperature than those of directly released tritium gas. Yet, the threshold of the H2 isotope exchange reaction is higher than the desorption reaction of tritiated water. Consequently, the effect of H2 isotope exchange reaction would reduce significantly on water adsorbed Li4SiO4 samples.
ISSN:1674-7291
1869-1870