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-ray spectrometers, 3; A Method to quantify radioiodine in thyroid for a newly developed thyroid monitoring systemYoshitomi, Hiroshi; Nishino, Sho; Takahashi, Masa; Tanimura, Yoshihiko
no journal, ,
The detector positions of the thyroid monitor were determined by Monte Carlo calculations using voxel phantoms so that the counting efficiency of the thyroid monitor was adequately high and less dependent on the age. The calibration conditions to reproduce the thyroid measurements of the monitored subjects were found using simplified physical phantoms including point sources.
Yoshitomi, Hiroshi; Nishino, Sho; Takahashi, Masa; Tanimura, Yoshihiko
no journal, ,
Furuta, Takuya; El Basha, D.*; Iyer, S. S. R.*; Correa Alfonso, C. M.*; Bolch, W. E.*
no journal, ,
With recent changes in the recommended annual dose limit on eye lens by International Commission on Radiological Protection, several Monte Carlo studies has been performed using a computational eye model. Although there are a large variety in size and shape for individual eyes, the eye model of one standard eye size and shape was adopted in most of those studies. We therefore constructed a geometric eye model that is both scalable and deformable, and studied dosimetry influence on the variation of the eye size and shape in the standard radiation geometries using Monte Carlo radiation transport code PHITS. We confirmed that only a trivial dependence on the eye size and shape, namely variation of the depth location of the ocular structures, was observed for radiation exposure in the broad radiation geometries.