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A Submillimeter spatial resolution scintillation detector for time-of-flight neutron diffraction imaging

中性子回折イメージング用のサブmm分解能型シンチレータ検出器

中村 龍也  ; 川崎 卓郎   ; 藤 健太郎  ; 筒井 紀彰; 海老根 守澄 ; 美留町 厚; 坂佐井 馨  

Nakamura, Tatsuya; Kawasaki, Takuro; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru

パルス中性子を用いた回折イメージングのためのサブmm空間分解能をもつシンチレータ検出器を開発した。検出ヘッド部は薄型のZnS/$$^{6}$$LiFシングルシンチレータと直径0.1mmの波長シフトファイバにより構成し高い位置分解能を実現した。有感面積24$$times$$24mm$$^{2}$$を有するプロトタイプ検出器の性能は分解能0.20および0.16$$pm$$0.06mm(x、y方向)、検出効率7%、$$^{60}$$Co $$gamma$$線感度10$$^{-6}$$である。本報では検出器の設計詳細とJ-PARC MLFにおける回折イメージング実験例を紹介する。

A two-dimensional scintillation neutron detector with a submillimeter spatial resolution was developed for pulsed neutron diffraction imaging at the J-PARC MLF. The detector comprised the thin, single ZnS/$$^{6}$$LiF scintillator screen coupled with the crossed wavelength-shifting fiber array for light collection. For a high spatial resolution, the wavelength shifting fibers with diameter of 0.1 mm were used them for assembling the detector. The prototype detector that has a neutron-sensitive area of 24 $$times$$ 24 mm$$^{2}$$ exhibited a spatial resolution of 0.20$$pm$$0.06 mm and 0.16$$pm$$0.06 mm for x and y directions, respectively. The detector had a detection efficiency of 7$$%$$ for thermal neutrons with a $$^{60}$$Co $$gamma$$-ray sensitivity in the order of 10$$^{-6}$$. In this paper detailed detector design is presented together with experimental results using the pulsed neutron beam.

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