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${it In-situ}$リチウム蒸着/イオン注入法により合成されたボロン中性子捕捉治療用中性子発生ターゲットの熱的安定性

Thermal stability of BNCT neutron production target synthesized by ${it in-situ}$ lithium deposition and ion implantation

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*

${it In-situ}$真空蒸着/イオン注入法により合成したBNCT治療用中性子発生源リチウムターゲットの熱的安定性をレーザー加熱実験により検証した結果、下記結論を得た。(1)N$$^{2+}$$イオン注入により表面窒化したターゲットのリチウム蒸発温度が120K程度上昇し、ターゲット自体の熱的耐久性が向上した。(2)また、${it in-situ}$真空蒸着/イオン注入法による損傷したターゲットの再補修が可能である。

To testify thermal stability of the BNCT neutron target synthesized by ${it in-situ}$ lithium deposition and ion implantation, laser heating test of the Li$$_{3}$$N/Li/Cu tri-layered target was conducted in high vacuum chamber of 10$$^{-6}$$ Pa and thermal stability of the tri-layered target was characterized by X-ray photoelectron spectroscopy. Following conclusions were derived; (1) The Li$$_{3}$$N/Li/Cu tri- layered target with very low oxide and carbon contamination was synthesized by ${it in-situ}$ lithium deposition and ion implantation techniques without H$$_{2}$$O and O$$_{2}$$ additions (2) The starting temperature of evaporation of the Li$$_{3}$$N/Li/Cu tri-layered target increased by 120 K compared to that of the Li/Cu target and (3) frequent repair synthesis of the damaged Li$$_{3}$$N/Li/Cu tri-layered target caused by evaporation is possible.

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パーセンタイル:12.14

分野:Metallurgy & Metallurgical Engineering

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