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Tritium extraction from lithium containing ceramics by thermal annealing in out-of-reactor experiments

A.A. Abramenkovs, J.E. Tiliks, V.G. Vasiljev1991年Fusion Engineering and DesignIF 1.7出版社

AbstractThe present paper shows that thermostimulated extraction of HTO and T2O from lithium ceramics Li4SiO4 proceeds according to two independent mechanisms: (a) the chemidesorption of surface-localized tritiated water (chemical reaction of the first order), and (b) the diffusion of triton to a near-surface layer with subsequent formation of HTO and T2O. The lithium silicates grain growth and increase of imaginary density of pellets influences to tritium diffusion in the grain volume. It was established that the change in the concentration of radiation-induced defects considerably affects the tritiated water releasing processes from lithium ceramics. This paper discusses the effect of chemisorbed water and the content of Fe3+ on the process of tritium thermoextraction.

日本語訳

要約本論文は、Li₄SiO₄リチウムセラミックスからのHTOおよびT₂Oの熱刺激抽出が、2つの独立した機構に従って進行することを示している:(a) 表面に局在するトリチウム水の化学脱離(一次の化学反応)、および (b) トリチウムの表面近傍層への拡散と、それに続くHTOおよびT₂Oの生成。リチウムシリケートの粒成長とペレットの見かけ密度の増加は、粒内におけるトリチウムの拡散に影響を及ぼす。放射線誘起欠陥の濃度変化が、リチウムセラミックスからのトリチウム水放出過程にかなりの影響を与えることが確認された。本論文は、化学吸着水とFe³⁺含有量がトリチウムの熱抽出プロセスに及ぼす影響について考察する。

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