[10a-E219-1~12] 2.1 Radiation physics, Material development and characteristic evaluation

12:15 PM - 12:30 PM JST(3:15 AM - 3:30 AM UTC)

[10a-E219-12] Development of Spatial Distribution Measurement System of Thermal Neutron Flux Using an Optical Fiber-Based Neutron Detector with a Spherical Li-Glass

〇Yutaro Saito¹, Yuya Oshima¹, Wakako Kitsuki¹, Kenichi Watanabe¹ (1.Kyushu Univ.)

Keywords:

Li glass,Neutron,Scintillator

Boron Neutron Capture Therapy (BNCT) is a promising next-generation cancer treatment, and ensuring its efficacy and safety requires neutron measurement techniques that can characterize the neutron distribution inside the body. In this study, we developed a system that uses an optical fiber-based neutron detector with a spherical Li-glass scintillator to measure the spatial distribution of thermal neutron flux within a water phantom simulating biological tissue. The system employs an aluminum frame and a stepping-motor-driven linear stage, allowing the detector to be moved to arbitrary positions inside the water tank. As an operational test, we performed an irradiation experiment using a Cf-252 source and obtained the depth-direction (z) distribution of neutron counts. We report these results and discuss the applicability of the system to evaluating thermal neutron flux distributions in water phantoms for BNCT.