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In-situ vacuum deposition technique of lithium on neutron production target for BNCT

BNCT用中性子発生源リチウムターゲットのin-Situ真空蒸着法

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*

BNCT治療装置用の中性子発生源リチウムターゲットにおける放射線損傷の低減化を図るためLi/Pd/Cu三層構造ターゲットモデルを新規提案し、電解メッキ技術とその場真空蒸着技術を融合化することにより同ターゲットモデルの試作を試みた。その結果、その場真空蒸着法によりPd/Cu上に均質なLi層を形成できること、補修時を想定し再蒸着できること並びにLi蒸着膜とPdは金属結合による強固な固着形態をしていることがわかった。

For the purpose of avoiding the radiation blistering of the lithium target for neutron production in BNCT (Boron Neutron Capture Therapy) device, trilaminar Li target, of which palladium thin layer was inserted between cupper substrate and Li layer, was newly designed. In-situ vacuum deposition and electrolytic coating techniques were applied to validate the method of fabrication of the Li/Pd/Cu target, and the layered structures of the synthesized target were characterized. In-situ vacuum re-deposition technique was also established for repairing and maintenance for lithium target damaged. Following conclusions were derived; (1) Uniform lithium layers with the thickness from 1.6 nm to a few hundreds nanometer were formed on Pd/Cu multilayer surface by in situ vacuum deposition technique using metallic lithium as a source material. (2) Re-deposition of lithium layer on Li surface can be achieved by in situ vacuum deposition technique.

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パーセンタイル:71.94

分野:Instruments & Instrumentation

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