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原子力機構FRSにおける高エネルギー$$gamma$$線校正場の構築

Establishment of high energy $$gamma$$-ray calibration field at the FRS of JAEA

古渡 意彦; 谷村 嘉彦  ; 堤 正博; 川崎 克也 ; 吉澤 道夫 

Kowatari, Munehiko; Tanimura, Yoshihiko; Tsutsumi, Masahiro; Kawasaki, Katsuya; Yoshizawa, Michio

日本原子力研究開発機構原子力科学研究所放射線標準施設では、ファンデグラーフ加速器を用いた高エネルギー$$gamma$$線校正場の構築を目指している。本校正場は、特にBWR周辺で見られる6MeV程度の高いエネルギーを有する$$gamma$$線の、正確な測定のために必須である。本校正場では、$$^{19}$$F(p,$$alpha$$$$gamma$$)$$^{16}$$O反応を利用して6-7MeVの光子を発生させ、$$gamma$$線校正場を構築する。校正場構築にあたり、高エネルギー光子特有の課題が幾つか挙がっている。本発表では、本校正場構築のために克服すべき課題を挙げ、校正場構築の現状について報告する。

A 6-7 MeV high energy $$gamma$$-ray field is to be established as a calibration field for radiation protection instruments at the Facility of Radiation Standards (FRS) of Japan Atomic Energy Agency (JAEA). This calibration field is essential to measure dose rates in accurate due to $$gamma$$-rays which are observed around BWRs. The $$gamma$$-ray field has been produced through the reaction of $$^{19}$$F(p,$$alpha$$$$gamma$$)$$^{16}$$O reaction using the accelerator. For establishing the calibration field, there are some difficulties to overcome which are caused by its $$gamma$$-ray energy. In the presentation, these difficulties will be presented and discussions concerning the establishment of the high energy $$gamma$$-ray calibration field will be made.

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