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KMID : 0364920140390010001
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Journal of Radiation Protection and Research
2014 Volume.39 No. 1 p.1 ~ p.6
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A Study on the Selection of Optimal Counting Geometry for Whole Body Counter (WBC)
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Ko Jong Hyun
Kim Hee-Geun
Kong Tae-Young
Lee Goung Jin
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Abstract
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A whole body counter (WBC) is used in nuclear power plants (NPP) to identify and measure internal radioactivityof workers who is likely to ingest or inhale radionuclides. WBC has several counting geometry, i.e. the thyroid, lung, wholebody and gastrointestinal tract, considered with the location where radionuclides are deposited in the body. But only wholebody geometry is used to detect internal radioactivity during whole body counting at NPPs. It is overestimated internalexposure dose because this measured values are indicated as the most conservative radioactivity values among the them ofothers geometry. In this study, experiments to measure radioactivity depending on the counting geometry of WBC werecarried out using a WBC, a phantom, and standard radiation sources in order to improve overestimated internal exposuredose. Quantitative criteria, could be selected counting geometry according to ratio of count rates of the upper and lowerdetectors of the WBC, are provided through statistical analysis method.
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KEYWORD
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Whole body counter, Counting geometry, Internally radioactive contamination, Humanoid phantom, Minitab
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