| Project/Area Number |
25600142
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Quantum beam science
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| Research Institution | Kyushu University |
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Principal Investigator |
Nohtomi Akihiro 九州大学, 医学(系)研究科(研究院), 准教授 (80243905)
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| Co-Investigator(Kenkyū-buntansha) |
Wakabayashi Genichiro 近畿大学, 原子力研究所, 准教授 (90311852)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| 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 / 反跳陽子比例計数管 / n/γ弁別 / 立ち上がり時間 / 放射線加重係数 / n/γ弁別の原理 / 中性子 / 逐次処理型繰込み式ベイズ推定法 |
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| 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.
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