| Project/Area Number |
22510067
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Risk sciences of radiation/Chemicals
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| Research Institution | National Institute of Radiological Sciences |
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Principal Investigator |
YAJIMA Kazuaki 独立行政法人放射線医学総合研究所, 福島復興支援本部, 主任研究員 (20392243)
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| Co-Investigator(Renkei-kenkyūsha) |
YASUDA Hiroshi 独立行政法人放射線医学総合研究所, 放射線防護研究センター, 上席研究員 (50250121)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 宇宙線 / 宇宙線被ばく / 中性子 / 放射線計測 / 線量評価 / フォスウィッチ検出器 / エネルギースペクトル / 乗鞍観測所 |
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| Research Abstract |
Measurements of energy spectra of high energy cosmic-ray origin neutron (10-200 MeV) have been carried out using a phoswich-type scintillation detector at the various geographical latitudes or altitudes in Japan. The measured peak that appeared in 100 MeV was sharper than a calculated value, namely, we succeeded in the measurement more high-resolution than a multi-moderator spectrometer with. The new method of high energy neutron energy spectrum measurement using the phoswich-type scintillation detector adopted in this work was able to catch qualitatively the latitude and altitude dependence of the cosmic-ray origin neutron energy spectra though quantitative differences have been existed between measured values and calculated values.
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