Journal of Radiation Protection and Research

  • 제26권3호
  • /
  • Pages.249-253
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  • 2001
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  • 2508-1888(pISSN)
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  • 2466-2461(eISSN)
대한방사선방어학회 (The Korean Association for Radiation Protection)
권호 표지

APPLICATION OF WHOLE BODY COUNTER TO NEUTRON DOSE ASSESSMENT IN CRITICALITY ACCIDENTS

  • Kurihara, O. (Radiation Protection Division, Tokai Works, Japan Nuclear Cycle Development Institute) ;
  • Tsujimura, N. (Radiation Protection Division, Tokai Works, Japan Nuclear Cycle Development Institute) ;
  • Takasaki, K. (Radiation Protection Division, Tokai Works, Japan Nuclear Cycle Development Institute) ;
  • Momose, T. (Radiation Protection Division, Tokai Works, Japan Nuclear Cycle Development Institute) ;
  • Maruo, Y. (Radiation Protection Division, Tokai Works, Japan Nuclear Cycle Development Institute)
  • 발행 : 2001.09.30
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초록

Neutron dose assessment in criticality accidents using Whole Body Counter (WBC) was proved to be an effective method as rapid neutron dose estimation at the JCO criticality accident in Tokai-mura. The 1.36MeV gamma-ray of $^{24}Na$ in a body can be detected easily by a germanium detector. The Minimum Detectable Activity (MDA) of $^{24}Na$ is approximately 50Bq for 10miniute measurement by the germanium-type whole body counter at JNC Tokai Works. Neutron energy spectra at the typical shielding conditions in criticality accidents were calculated and the conversion factor, whole body activity-to-organ mass weighted neutron absorbed dose, corresponding to each condition were determined. The conversion factor for uncollied fission spectrum is 7.7 $[(Bq^{24}Na/g^{23}Na)/mGy]$.

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