Measurement of Residual 152Eu Activity Induced by Atomic Bomb Neutrons in Nagasaki and the Contribution of Environmental Neutrons to This Activity.

• SHIZUMA KIYOSHI

  Graduate School of Engineering, Hiroshima University

• ENDO SATORU

  Graduate School of Engineering, Hiroshima University

• HOSHI MASAHARU

  Research Institute for Radiation Biology and Medicine, Hiroshima University

• TAKADA JUN

  Research Institute for Radiation Biology and Medicine, Hiroshima University

• ISHIKAWA MASAYORI

  Research Institute for Radiation Biology and Medicine, 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

抄録

Residual ¹⁵²Eu 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 ¹⁵²Eu 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 ⁶⁰Co and ³⁶Cl. 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 ¹⁵²Eu are also discussed.<br>

収録刊行物

• Journal of Radiation Research

  Journal of Radiation Research 44 (2), 133-139, 2003

  Journal of Radiation Research 編集委員会

キーワード

• ¹⁵²Eu activity
• Atomic bomb
• DS86
• Neutrons

詳細情報

• CRID: 1390001205214958720
• NII論文ID: 110002328876
• NII書誌ID: AA00705792
• DOI: 10.1269/jrr.44.133
• COI: 1:CAS:528:DC%2BD3sXmslCqtbg%3D
• ISSN: 13499157
• ISSN: 04493060
• NDL書誌ID: 6610347
• PubMed: 13678342
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6610347
• Web Site: http://academic.oup.com/jrr/article-pdf/44/2/133/3166074/jrr-44-133.pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10918125
• Web Site: https://search.jamas.or.jp/link/ui/2004193051
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • PubMed
  • NDL-Digital
  • CiNii Articles
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