3KeV H irradiation to Li/Pd/Cu trilaminar neutron production target for BNCT

BNCT用Li/Pd/Cu三層中性子発生用ターゲットの3KeVH照射効果

石山 新太郎; 藤井 亮*; 中村 勝*; 今堀 良夫*

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

Li/Pd/Cu三層中性子発生ターゲットの3KeV H照射を行い、ターゲットの生じる物理的化学的特性変化をXPS及びXAFSを用いて調べた結果、下記成果を得た。(1)無電解メッキによるPd/Cuターゲットの境界面結合は物理的結合である。(2)H照射によりPd 4のエッジジャンプが生じた。これは照射により4バンド内にホールが生じたことを意味している。(3)Pd 4に0.9eVの化学シフトが照射により生じた。これはPd内にPdH化合物が生成したものを考えられる。

The Li/Pd/Cu trilaminar structures of the synthesized target for BNCT were characterized under 3keV H irradiation by XPS and XAFS technique, which provides structural/electronic properties of solids, and information about the local structure, such as the nature and number of surrounding atoms and inter-atomic distances. Following conclusions were derived; (1) Pd-Cu physical bonding was produced between the Pd and Cu interface by electro-less plating Pd deposition on a high purity Cu plate (2) From the XAFS observation of white line of Pd, the Pd 3 Edge jump was found after H irradiation, this fact indicates increase of hole density in Pd 4-band. (3) 0.9 eV chemical shift was also observed in Pd 3 white line for Pd/Cu samples, which will affect the quality of the Li/Pd/Cu target due to the formation of PdH in palladium insert layer.