Abstract
We developed a new thyroid monitor using multiple high energy resolution Gd3(Al,Ga)5O12(Ce) (HR-GAGG) detectors (each crystal size = 1-cm3), in particular with an intention of measuring small children (including infants) for their internal thyroid exposure from radioiodine following a nuclear accident. The small-sized HR-GAGG detectors allowed to be placed around the human neck at the close distance to increase the geometrical efficiency for 131I localized in the thyroid. We tested two arrangements of the eight HR-GAGG detectors using four age-specific phantoms in each of which a thyroid-shaped container filled with standard 131I solution was installed. The results demonstrated that the minimum detectable activity (MDA) of the new monitor reached 20–30 Bq with a counting time of 180 s, which is significantly lower than that of a conventional NaI(Tl) survey meter (crystal size: 1-inch-dia,1-inch-thick) commonly used for measuring air dose rates.
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