Measurement of Residual ^<152>Eu Activity Induced by Atomic BombNeutrons in Nagasaki and the Contribution of Environmental Neutrons to This Activity

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概要

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• Residual ^<152>Eu activities induced by neutrons from the Nagasaki atomic bomb were measured for nine mineral samples located up to 1,061 m in the slant range and one control sample at 2,850 m from the hypocenter. A chemical separation to prepare europium-enriched samples was performed for all samples, and gamma ray measurements were carried out with a low background well-type germanium detector. In this paper, the measured specific activities of ^<152>Eu are compared with activation calculations based on the DS86 neutron fluence and the 93Rev one. The calculated-to-measured ratios are also compared with those of ^<60>Co and ^<36>Cl. The present results indicate that the measurements agree to the calculation within a factor of three as observed in the nuclear tests at Nevada. The activation level of environmental neutrons and the detection limit for ^<152>Eu are also discussed.

• 日本放射線影響学会の論文

著者

• TAKADA JUN

  Research Institute for Radiation Biology and Medicine, Hiroshima University

• HOSHI MASAHARU

  Research Institute for Radiation Biology and Medicine, Hiroshima University

• 高田 純

  Department Of Physics School Of Medicine Sapporo Medical University

• 静間 清

  広島大学大学院工学研究科

• Ishikawa Masayori

  広島大学原爆放射線医科学研究所 分子発がん制御研究分野

• 石川 正純

  北海道大学

• 石川 正純

  東京大学・原子力研究総合センター

• Ishikawa Masayori

  Department Of Medical Physics Hokkaido University Hospital

• 石川 正純

  東京大学大学院工学系研究科

• Ishikawa Masayori

  Research Institute For Radiation Biology And Medicine Hiroshima University

• 遠藤 暁

  Mechanical System Engineering Graduate School Of Engineering Hiroshima University

• Endo Satoru

  Department Of Biochemistry Cancer Institute Okayama University Medical School

• Endo Satoru

  Research Institute Of Radiation Biology And Medicine Hiroshima University

• Takada J

  Okayama Univ. Okayama Jpn

• SHIZUMA KIYOSHI

  Graduate School of Engineering, Hiroshima University

• ENDO SATORU

  Graduate School of Engineering, Hiroshima University

• IWATANI KAZUO

  Hiroshima Prefectural College of Health and Welfare

• HASAI HIROMI

  Department of Electrical Engineering, Hiroshima Kokusai Gakuin University

• OKA TAKAMITSU

  Kure University

• FUJITA SHOICHIRO

  Radiation Effects Research Foundation

• WATANABE TADAAKI

  Radiation Effects Research Foundation

• YAMASHITA TOMOAKI

  Radiation Effects Research Foundation

• IMANAKA TETSUJI

  Research Reactor Institute, Kyoto University.

• Endo Satoru

  Div. Environ. Biol. Res. Inst. Rad. Biol. And Med. Hiroshima University

• Itoh Tetsuo

  広島大学 工学研究科機械システム工学専攻

• Hoshi Masaharu

  Research Institute For Nuclear Medecine And Biology Hiroshima University

• Shizuma Kiyoshi

  広島大学 工学研究科機械システム工学専攻

• Itoh T

  Atomic Energy Research Institute Kinki University

• Hasai Hiromi

  Department Of Applied Physics And Chemistry Faculty Of Engineering Hiroshima University

• Oka Takamitsu

  Kure Univ. Kure Jpn

• 静間 清

  広島大学大学院工学部工学研究科

• Imanaka Tetsuji

  Research Reactor Inst Kyoto Univ.

• Hasai H

  Department Of Electrical Engineering Hiroshima Kokusai Gakuin University

• Fujita S

  Radiation Effects Research Foundation

• Takada Jun

  Research Institute For Nuclear Medicine And Biology Hiroshima University

• IMANAKA Tetsuji

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

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