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Development and characterization of a neutron personal dose equivalent monitor

中性子個人線量当量モニタの開発と特性評価

辻村 憲雄   ; 吉田 忠義 ; 布宮 智也*; 青山 敬*

Tsujimura, Norio; Yoshida, Tadayoshi; Nunomiya, Tomoya*; Aoyama, Kei*

中性子個人線量当量(H$$_{p}$$(10))測定器を新たに開発した。本測定器は、減速材付中性子線量当量率モニタの一部と入射角度依存性を調節するためのボロンポリエチレン遮へいからなる。感度特性がH$$_{p}$$(10)のエネルギー依存性と入射角度依存性に合致するようモンテカルロ計算により詳細構造を設計した。単色中性子場及び$$^{252}$$Cf減速中性子校正場での中性子照射試験から、本測定器が優れた特性を有していることを確認した。実際の作業場で中性子個人線量計のフィールド実験を行う場合に、当該場所における基準中性子線量当量を決定することができる。

The authors developed a new neutron-measuring instrument that was designed to measure a neutron personal dose equivalent, H$$_{p}$$(10). This instrument is composed of a conventional moderator-based neutron dose equivalent meter and a neutron shield made of borated polyethylene which covers a backward hemisphere to adjust the angular dependence. The whole design was determined on the basis of MCNP calculations so as to have response characteristics which would generally match both energy and angular dependencies of H$$_{p}$$(10). The verification experiments for energy and angular responses were done using monoenergetic neutrons produced by the accelerator and polyenergetic neutrons from the moderated $$^{252}$$Cf source. As results of experiments, it is found that this new instrument has reasonably acceptable responses as a reference neutron dosemeter.

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