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KMID : 0364920010260030249
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Journal of Radiation Protection and Research
2001 Volume.26 No. 3 p.249 ~ p.253
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Application of Whole Body Counter to Neutron Dose Assessment in Criticality Accidents
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O kurihara
N Tsujimura/K Takasaki/T Momose/Y Maruo
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Abstract
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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 24Na in a body can be detected easily by a germanium detector. The Minimum Detectable Activity (MDA) of 24Na 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 [(Bq24Na/g23Na)/mGy].
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KEYWORD
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