Preliminary study on a new neutron spectrum measurement method for the angle and energy differential neutron field
1Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka, 565-0871, Japan.
Abstract:
Boron neutron capture therapy (BNCT) is an effective cancer treatment that utilizes neutron irradiation; it is necessary to evaluate the characteristics of the therapeutic neutron field as accurately as possible to minimize the unwanted dose to patients. As an approach to this issue, we are currently considering a new method to measure the double-differential neutron spectrum (DDNS) in terms of both angle and energy. In this study, a new spectrometer for this system was designed, and feasibility studies were conducted using numerical simulations. As a result, the validity of this method was confirmed at angles less than 30°. However, the evaluated spectra differed from the true spectrum at angles greater than 45°. These results imply that the current system exhibits excessive sensitivity to neutrons incident on the side surface of the spectrometer, necessitating design improvements.
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