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Neutron/$$gamma$$-ray discrimination based on the property and thickness controls of scintillators using Li glass and LiCAF(Ce) in a $$gamma$$-ray field

$$gamma$$線場におけるLiガラスならびにLiCAF(Ce)による性質ならびに厚さの制御に基づく中性子/$$gamma$$線識別

冠城 雅晃   ; 島添 健次*; 寺阪 祐太   ; 富田 英生*; 吉橋 幸子*; 山崎 淳*; 瓜谷 章*; 高橋 浩之*

Kaburagi, Masaaki; Shimazoe, Kenji*; Terasaka, Yuta; Tomita, Hideki*; Yoshihashi, Sachiko*; Yamazaki, Atsushi*; Uritani, Akira*; Takahashi, Hiroyuki*

波形分別手法を実施せず、強い$$gamma$$線場において熱中性子検出器をするための無機シンチレーターの厚さと性質の制御に焦点を当てた。測定では、0.5mmならびに1.0mm厚のGS20$$^{rm{TM}}$$(Liガラス)ならびにLiCaAlF$$_6$$結晶(LiCAF:Ce)を採用し、上記のシンチレーターを結合させた光電子増倍管からのパルス信号を1Gspsのデジタル信号処理に入力し、360ns間の波形面積を積分した。$$^{60}$$Coの$$gamma$$線場において、0.5mm厚のGS20$$^{rm{TM}}$$では0.919Gy/hまで中性子検出器が可能であった。一方で、0.5mm厚のLiCAF:Ceは、0.473Gy/hまで中性子検出が可能であったが、0.709Gy/hで中性子検出器が不可能であり、中性子/$$gamma$$線分別において、GS20$$^{rm{TM}}$$は、より良いエネルギー分解能と高中性子検出効率により、LiCAF:Ceよりも優れている結果であった。

We focus on the thickness and property controls of inorganic scintillators used for thermal neutron detection in intense $$gamma$$-ray fields without considering pulse shape discrimination techniques. GS20$$^{rm{TM}}$$ (a lithium glass) and LiCaAlF$$_6$$:Ce(LiCAF:Ce) cintillators with thicknesses of 0.5 and 1.0 mm, respectively, have been employed. Pulse signals generated by photomultiplier tubes, to which the scintillators were coupled, were inserted into a digital pulse processing unit with 1 Gsps, and the areas of waveforms were integrated for 360 ns. In a $$^{60}$$Co $$gamma$$-ray field, the neutron detection for GS20$$^{rm{TM}}$$ with a 0.5-mm thickness was possible at dose rates of up to 0.919 Gy/h; however, for LiCAF:Ce, neutron detection was possible at 0.473 Gy/h, and it failed at 0.709 Gy/h. Threfore, in a $$^{60}$$Co $$gamma$$-ray field, the neutron/$$gamma$$-ray discrimination of GS20$$^{rm{TM}}$$ was better than that of LiCAF:Ce due to its better energy resolution and higher detection efficiency.

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