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ENGIN-X型1次元シンチレータ中性子検出器の製作と性能試験

Performance test of the Japanese ENGIN-X type linear scintillation neutron detector

中村 龍也; 坂佐井 馨; 片桐 政樹; 美留町 厚; 細谷 孝明; 曽山 和彦; 佐藤 節夫*; Shooneveld, E.*; Rhodes, N.*

Nakamura, Tatsuya; Sakasai, Kaoru; Katagiri, Masaki; Birumachi, Atsushi; Hosoya, Takaaki; Soyama, Kazuhiko; Sato, Setsuo*; Shooneveld, E.*; Rhodes, N.*

ENGIN-X型1次元シンチレータ中性子検出器を試作しその検出性能試験・評価を行った。試作した検出器は英国ラザフォードアップルトン研究所にて開発されたものでISISパルス中性子源ENGIN-X装置にて稼動しているものと同型である。試作した検出器はENGIN-X装置の1検出器モジュールであり、幅3mm,高さ196mmの中性子有感ピクセルが240チャンネル配置された構造を有する。検出器性能試験を行った結果、試作検出器が位置分解能3mm,中性子検出効率64%(中性子波長1.8${AA}$)、計数ユニフォーミティー6$$sim$$7%、$$^{60}$$Co $$gamma$$線感度$$sim$$5$$times$$10$$^{-7}$$を有することを確認し、大強度陽子加速器計画における残留応力解析や粉末回折実験装置に必要な1次元シンチレータ中性子検出器の国産化の見通しを得た。

The ENGIN-X type linear scintillation neutron detector was manufactured in Japan and the detector performances were evaluated. The ENGIN-X type linear scintillation neutron detector was originally developed by the detector group in Rutherford Appleton Laboratory and the Japanese prototype detector was identical to that which is one of the detector modules installed in the ENGIN-X diffractometer at ISIS pulsed neutron source. The prototype detector can install 240 elements of neutron-sensitive scintillator, where each element has 3 mm in width and 196 mm in length. The prototype detector exhibited a spatial resolution of 3 mm, detection efficiency of 64% for neutrons with wave-lengths of 1.8${AA}$, count uniformity of 6$$sim$$7%, $$^{60}$$Co $$gamma$$ sensitivity of $$sim$$5$$times$$10$$^{-7}$$. Technological transfer to the Japanese manufacturer was done successfully and the mass production of these detectors for the J-PARC project is feasible.

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