WEP129 　加速器応用・産業利用　 8月8日 大展示ホール 13:10 - 15:10

Experimental Verification of Neutron Flux Calculation for Compact Accelerator-Based Multi-Port BNCT System

○Hui Wen Koay, Tatsushi Shima, Mitsuhiro Fukuda, Hiroki Kanda, Shuhei Hara (Research Centre for Nuclear Physics (RCNP), Osaka University)

This work aims to verify the neutron transportation calculations performed in PHITS for the development of a compact accelerator-based multi-port Boron Neutron Captured Therapy (BNCT) system. Several test experiments were performed in RCNP using a 53 MeV proton beam from an AVF cyclotron onto a W target, with and without test moderator assemblies. NE213 liquid scintillator and Li-6 glass scintillator were used for the detection of fast and epithermal neutrons respectively. The measured integrated angular neutron yield without a moderator agreed with the calculations within 20 to 23%. The difference appeared mainly in the higher energy region. Preliminary results of neutron spectrum with simple test moderator assemblies showed significant discrepancy at lower energy region. This is probably due to the contamination of background gamma-rays which leads to a poor signal-to-noise ratio. In this paper, the experimental results and comparison to the calculations will be discussed.