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Simplified Calibration Method for the Transportable Whole Body Counting System in Radiation Accidents

A whole body counter is used for assessment of internal dose in the body by directly measuring the radiation emitted from the body. It is the most reliable and standard method of monitoring for internal exposure. National Radiation Emergency Medical Center in Korea Institute of Radiological and Medical Science constructed the transportable whole body counting system with chair geometry. The system uses HPGe detector as in-vivo monitoring device. Good energy resolution of the system was obtained with the HPGe detector. Although chair geometry used in the system has poor uniformity of the detector response, it is more suitable than other geometries as transportable system for accidental monitoring of internal contamination. In this study, relative response of the single torso detector according to position of the detector was analyzed to determine counting distance between subject and detector and to promote conventional calibration method for whole body counting system. Activities in each part of the phantom were measured to obtain detector response, and counting efficiency under various conditions was analyzed to improve performance of the in-vivo monitoring system. It was found that single torso detector in chair geometry is not sensitive to activity above the neck and below thighs. Therefore, transportable system can be more conveniently calibrated by using only parts of the torso and arms among whole body phantoms at the scene in the vicinity of radiation accident.