Abstract
A portable chair type whole-body counter has been studied which is for internal contamination monitoring of the subjects working in nuclear facilities. A 3″φx3” Nal(Tl) crystal housed in a lead collimator is used. Findings from the study are as follows: the crystal size does not influence the screening level of internal contamination defined as a three standard deviation above the mean level of distributed counts obtained for the uncontaminated subjects. Reasonable shieldings of both detector and chair may be more than 3.8 cm of lead. A three-channel pulse height analyzer set in the γ energy region above 0.2 MeV will be suitable for the monitoring. The detection sensitivities for stomach, lung, kidney and small intestine to a 137Cs source are not lower than in the case of the homogeneous distribution in the whole body revealed by phantom study.
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