Characteristics of the 2012 model lithium-6 time-analyzer neutron detector (LiTA12) system as a high efficiency detector for resonance absorption imaging

共鳴吸収イメージング用高効率検出器としての2012型リチウム-6時間分析中性子検出器(LiTa12)システムの特性

甲斐 哲也   ; 佐藤 節夫*; 廣井 孝介  ; Su, Y. H.  ; 瀬川 麻里子   ; Parker, J. D.*; 松本 吉弘*; 林田 洋寿*; 篠原 武尚   ; 及川 健一   ; 鬼柳 善明*

Kai, Tetsuya; Sato, Setsuo*; Hiroi, Kosuke; Su, Y. H.; Segawa, Mariko; Parker, J. D.*; Matsumoto, Yoshihiro*; Hayashida, Hirotoshi*; Shinohara, Takenao; Oikawa, Kenichi; Kiyanagi, Yoshiaki*

The 2012 model lithium-6 time-analyzer neutron detector (LiTA12) system, based on a lithium glass scintillator and multi-anode photomultiplier tube, has the highest neutron efficiency among the detectors for pulsed neutron imaging together with a flexibility of the efficiency by changing the thickness of the lithium glass. The authors expect this detector system could become a main detector system for the energy-resolved neutron imaging system, RADEN, at J-PARC, and have started evaluation of the LiTA12 system. For example, spatial resolution for resonance absorption imaging was evaluated by using a line-pair pattern made by 3 micro meter thick gold on a quartz plate. Less than 1 mm width line pairs were resolved at an 8 Mcps neutron counting rate and around 5 eV neutron energy.