Basic study on development of easy-handling fast-neutron survey meter like as a GM tube.

2015 Fiscal Year Final Research Report

• Project/Area Number: 25600142
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Kyushu University
• Principal Investigator: Nohtomi Akihiro 九州大学, 医学(系)研究科(研究院), 准教授 (80243905)
• Co-Investigator(Kenkyū-buntansha): Wakabayashi Genichiro 近畿大学, 原子力研究所, 准教授 (90311852)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 高速中性子 / ポリエチレン内張型反跳陽子比例計数管 / ベイズの定理 / レム応答 / 中性子線量当量 / エネルギー依存性

Outline of Final Research Achievements

Basic response characteristics of a polyethylene-lined recoil proton proportional counter have been examined, aiming at developing an easy-handling fast-neutron survey meter like as a GM tube; especially the pulse rise-time discrimination property between fast neutrons and gamma-rays.
It has been revealed that energy-dependence of sensitivity of the polyethylene-lined recoil proton proportional counter indicates so called“Rem response property”for fast neutrons from a few hundred keV to a few MeV. The conversion factor is estimated to be about 4.4 nSv/neutron, whose sensitivity corresponds to 1/5～1/50 of the commercially-available neutron rem counters. In conclusion, the polyethylene-lined recoil proton proportional counter is usable for an evaluation of the fast neutron dose-equivalent.

Free Research Field

放射線計測学