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Performance measurement of the scintillator with optical fiber detector for boron neutron capture therapy

ホウ素中性子捕捉療法で使用する光ファイバーを用いた中性子検出器の特性測定

米田 政夫; 熊田 博明; 石川 正純*; 中村 剛実; 山本 和喜; 松村 明*

Komeda, Masao; Kumada, Hiroaki; Ishikawa, Masayori*; Nakamura, Takemi; Yamamoto, Kazuyoshi; Matsumura, Akira*

The thermal neutron flux can be easily measured in real time by using the SOF (Scintillator with Optical Fiber) detector. However the irradiation damage under high-intensity neutron flux causes the deterioration of the SOF detector due to the plastic scintillator in which $$^{6}$$LiF is blended. After irradiating the SOF detector for 4 hours (thermal neutron fluence approximately 2.0$$times$$10$$^{13}$$ neutrons/cm$$^{2}$$), the sensitivity of the SOF detector decreased by 3.0%. After irradiating the SOF detector for 2 months (thermal neutron fluence approximately 6.4$$times$$10$$^{14}$$ neutrons/cm$$^{2}$$), the sensitivity was reduced to 42%. Supposing that the thermal neutron fluence is 2$$times$$10$$^{12}$$ (neutrons/cm$$^{2}$$) on the surface of a patient in a BNCT treatment, the sensitivity of the SOF detector is reduced by approximately 0.3%. This report presents investigations on the deterioration of the SOF detector in irradiation experiments.

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パーセンタイル:69.9

分野:Chemistry, Inorganic & Nuclear

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