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Simple estimation method of $$gamma$$-ray dose using low neutron-sensitive TLD (UD-170LS) for Intra-Operative Boron Neutron Capture Therapy (IOBNCT)

術中ホウ素中性子捕捉療法のための低中性子感度TLD(UD-170LS)を用いた$$gamma$$線線量の簡易評価方法

山本 和喜; 熊田 博明; 鳥居 義也; 岸 敏明; 山本 哲哉*; 松村 明*

Yamamoto, Kazuyoshi; Kumada, Hiroaki; Torii, Yoshiya; Kishi, Toshiaki; Yamamoto, Tetsuya*; Matsumura, Akira*

術中ホウ素中性子捕捉療法(IOBNCT)での脳の最大$$gamma$$線線量を評価するために、本研究では、(1)低中性子感度TLDの開発,(2)各種コリメータサイズに対する捕獲$$gamma$$線分布の相関式,(3)IOBNCTへの適応のため最大$$gamma$$線線量の簡易評価相関式の導出を行った。TLDの熱中性子感度は、$$^{60}$$Co等価で、5.1$$pm$$0.8$$times$$10$$^{-14}$$($$^{60}$$Co-Gycm$$^{2}$$)であった。$$gamma$$線の予測値と実験値との平均偏差は、熱-熱外中性子混合ビームに対して$$pm$$8.5%であった。この簡易方法によって医療照射における$$gamma$$線線量の決定精度は改善される。

In order to estimate the maximum gamma-ray dose in the brain in Intra-Operative Boron Neutron Capture Therapy (IOBNCT), this study was conducted for (1) the development of low neutron-sensitive TLD (UD-170LS-T2), (2) the correlation of capture gamma-ray dose profile in a phantom for various collimator sizes, and (3) the formula for simple estimation of maximum gamma-ray dose on IOBNCT. The sensitivity of TLD, as $$^{60}$$Co $$gamma$$-ray equivalent, for thermal neutron was 5.1$$pm$$0.8$$times$$10$$^{-14}$$($$^{60}$$Co-Gycm$$^{2}$$)The average relative deviations between predicted and measured $$gamma$$-ray dose for the mixed epithermal-thermal neutron beam in the phantom were $$pm$$8.5%. The accuracy of the $$gamma$$-ray dose determination in the clinical BNCT may be improved by this simple method.

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