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Evaluation of Atomic-Bomb neutorons by means of low-background r-spectroscopy

Research Project

Project/Area Number 04455019
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 広領域
Research InstitutionGrant-in-Aid for Scientific Research (B)

Principal Investigator

HASAI Hiromi  Hiroshima Univ.Engineering, Professor, 工学部, 教授 (70034337)

Co-Investigator(Kenkyū-buntansha) SHIZUMA Kiyoshi  Hiroshima Univ.Engineering, Associate Professor, 工学部, 助教授 (10127657)
IWATANI Kazuo  Hiroshima Univ.Engineering, Associate Professor, 工学部, 助教授 (20034374)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥6,800,000 (Direct Cost: ¥6,800,000)
KeywordsAtomic Bomb / Neutron dose / Europium 152 / Cobalt 60 / residual activity / Depth profile / low-background / Ge detector
Research Abstract

The specific activity ^<152>Eu/Eu was measured for 80 samples collected within 1500 m from the Hiroshima hypocenter. The residual activity ^<60>Co was also measured for irons and rocks exposed to the A-bomb neutrons. The results are as follows.
1.The directional distribution of emitted neutrons were investigated through the Eu activation. It was found that the activity yield in the direction of WSW decreased rapidly as the function of the distance compered to other directiond. This indicates that the neutron energy was low in this dirction.
2.It was shown that the measured ^<152>Eu and ^<60>Co activities were systematically lower than the calculation near the hypocenter and vice versa at long distances beyond 1000 m. These results are consistent with recent measurement of ^<36>Cl by means of accelerator mass spectroscopy.
3.Depth distribution of ^<152>Eu in stones are similar at distance 100 m (Motoyasu bridge)and at 500 m (Shirakami Shrine).
These results indicate that systematic errors exist in the DS86 neutrons concerning to the source-term spectrum, neutron transport calculation in air, and/or activation measurement.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] K.Shizuma: "Specific activities of ^<60>Co and ^<152>Eu in Samples collected from the Atomic-Bomb Dome in Hiroshima" Journal of Radiation Research. 33. 151-162 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Shizuma: "Low-background Shielding of Ge detectors for the measurement of residual ^<152>Eu radioactivity induced by neutrons from the Hiroshima atomic bomb" Nuclear Instruments & Methods in Physics research. B66. 459-464 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] M.Hoshi: "Benchmark test of tramsport calculation of Gold and nickel activation with implication for Newtron Kerma at Hiroshima" Health Physics. 63. 532-542 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Shizuma: "Residual ^<152>Eu and ^<60>Co activities induced by neutrons from the Hiroshima atomic bomb" Health Physics. 65. 272-282 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 葉佐井 博巳: "原爆放射線の人体影響,20-3残留放射能(分担執筆)" 文光堂(東京), 369(348-356) (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Shizuma: "Specific activities of ^<60>Co and ^<152>Eu in Samples collected from the Atomic-Bomb Dome in Hiroshima" Journal of Radiation Research. 33. 151-162 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Shizuma: "Low-background Shielding of Ge detectors for the measurement of residual ^<152>Eu radioactivity induced by neutrons from the Hiroshima atomic bomb" Nuclear Instruments & Methods in Physics Research. B66. 459-464 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] M.Hoshi: "Benchmark test of transport caluclation of gold and nickel activation with implication for newtron Kerma at Hiroshima" Heal Physics. 63. 532-542 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Shizuma: "Residual ^<152>Eu and ^<60>Co activities induced by neutrons from the Hiroshima atomic bomb" Health Physics. 65. 272-282 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Hasai: Effect of atomic bomb radiation for human body 20-3 residual radioactivity. Bunko-do, 348-356 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Shizuma: "Specific activities of ^<60>Co and ^<152>Eu in Samples collected from the Atomic Bomb Dome in Hiroshima" Journal of Radiation Research. 33. 151-162 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Shizuma: "Low-background shielding of Ge detectors for the measurement of residual ^<152>Eu radioactivity induced by neutrons from the Hiroshima atomic bomb" Nuclear Instruments & Methods in Physics Research. B66. 459-464 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hoshi: "Benchmark test of transport calculation of Gold and nickel activation with implication for Neutron Kerma at Hiroshima" Health Physics. 63. 532-542 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Shizuma: "Residual ^<152>Eu and ^<60>Co activities induced by neutrons from the Hiroshima atomic bomb" Health Physics. 65. 272-282 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 葉佐井博巳: "原爆放射線の人体影響(分担執筆),20-3残留放射能" 文光堂(東京), 369(348-356) (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Shizuma: "Specific Activities of ^<60>Co and ^<152>Eu in Samples collected from the Atomic-Bomb Dome in Hiroshima" Journal of Radiation Research. 33. 151-162 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Shizuma: "Low-background shielding of Ge detectors for the measurement of residual ^<152>Eu radioactivity induced by neutrons from the Hiroshima atomic bomb" Nuclear Instruments & Methods in Physics Research. B66. 459-464 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Hoshi: "Benchmark test of transport ca of Gold and Nickel activation with implications for neutron kerma at Hiroshima" Health Physics. 63. 532-542 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 葉佐井 博巳: "原爆放射線の人体影響1992" 文光堂, 369 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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