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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)

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

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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