Development of low energy neutron spectrometer for accelerator based neutron source for BNCT

为BNCT研制了一种新型加速器中子源低能中子能谱仪。对于BNCT来说，中子场的表征是一个关键问题，特别是对于ABNS而言。然而，外热中子的测量并不简单。本研究利用位置敏感比例计数器，利用其两端的一条边是中子的入口窗口，测量探测深度分布。将测得的探测深度分布转换为中子能谱。制作了原型探测器，以证实在热区到外热区能量范围内测量中子能谱的可行性。

A new low-energy neutron spectrometer for accelerator based neutron source (ABNS) for BNCT has been developed. For BNCT, it is a crucial issue to characterize the neutron field especially for ABNS. However, measurement of epi-thermal neutrons is not straightforward. In this study, using a position sensitive proportional counter as its one edge of the two is an entrance window of neutrons, detection depth distribution is measured. The measured detection depth distribution is converted to the neutron energy spectrum. Prototype detectors were produced to confirm the feasibility to measure the neutron spectrum in energies from thermal to epi-thermal region.