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On-line evaluation of spatial dose-distribution by using a 15m-long plastic scintillation-fiber

長さ15mのシンチレーション・ファイバーを用いた放射線空間分布のオンライン評価

納冨 昭弘*; 杉浦 紳之*; 伊藤 哲夫*; 今道 祥二*; 鳥居 建男  ; 野間 宏*

Notomi, Akihiro*; Sugiura, Nobuyuki*; Ito, Tetsuo*; Imamichi, Shoji*; Torii, Tatsuo; Noma, Hiroshi*

長さ15mのプラスチック・シンチレーションファイバー(PSF)を用いて、低出力研究炉(近畿大学炉)の炉室内での放射線量率の空間分布の実時間測定を行った。PSF検出器は放射線の実時間測定に簡便かつ迅速に測定が可能であることがわかった。また、RIを用いるような医学利用にも有効であると考えられる。しかし、現段階では、利用可能な長さは15m程度までと考えられる。

A 15 m-long plastic scintillation fiber (PSF) detector has been applied to the on-line evaluation of spatial dose-distribution inside the room of a low power research-reactor. It was found that the present PSF detector has enough performance as the real-time measurement system which is not only quick and simple but also reliable for monitoring use in that situation. Such application may be also useful at the medical fields which routinely use radio isotopes for diagnosis purposes (such as PET facility). From the present observation, it seems that the practically-acceptable maximum limit of PSF length is at most 15 m. More than this, the severe signal reduction brings unavoidable difficulties for the following signal processing.

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