Abstract
The counting efficiency and detection limit of a thyroidal 131 I monitoring system using a whole body counter facility is described. Calibration factors are presented for a collimated high purity Ge detector (HPGe) of 12.5% efficiency and thyroid phantoms for two groups of people of different ages: children of 10 and 15 years old and ICRP reference man and woman. The construction of a neck human phantom with a human-like thyroid gland of various volumes used in calibration permits the correction of measured thyroidal 131 I activity to the thyroid depth in neck tissue. Counting efficiencies of the proposed thyroid realistic phantom are compared with calibration data from the often used cylindrical thyroid phantom of two separated lobes
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