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ホウ素中性子捕獲療法のためのリチウムターゲット表面に合成したLi$$_{3}$$Nの表面化学状態

Surficial chemical states of Li$$_{3}$$N synthesized on lithium target for boron neutron capture therapy

石山 新太郎; 馬場 祐治; 藤井 亮*; 中村 勝*; 今堀 良夫*

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

ホウ素中性子捕獲治療法のためのリチウムターゲット表面に合成した蒸発防止用Li$$_{3}$$N表面層のO及びCの表面汚染を低減するための1123Kまでの超真空加熱試験を実施した結果、主要な汚染要素であるH$$_{2}$$O, Li化合物であるLiOH及びLi$$_{2}$$CO$$_{3}$$は1123Kまでの真空加熱による分解除去できることがわかった。

To remove high level of contaminants by O and C from Li$$_{3}$$N surface for boron neutron capture therapy target, high temperature thermal desorption was conducted up to 1123 K in ultra high vacuum and the following results were derived; (1) During thermal desorption up to 1023 K, typical three peaks of vacuum pressure disturbance due to vaporization of contaminants were observed in vacuum pressure-temperature curve. (2) Over-layered contaminants with high melting temperature below 1023 K on Li$$_{3}$$N surface is completely removed by high temperature thermal desorption up to 1123 K in ultra high vacuum. (3) From these desorption results, it is suggested that these contaminants corresponding to these vaporization peaks are H$$_{2}$$O and Li compounds with high melting temperature below 1023 K, of which LiOH and Li$$_{2}$$CO$$_{3}$$ were synthesized by decomposition process of Li$$_{3}$$N with residual H$$_{2}$$O and CO$$_{2}$$ in low temperature.

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