http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ragheb Vahid,Sajjadi Zahra,Mohammadi Saeed 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.12
The purpose of this study was to investigate the effect of changes in the thyroid mass on its absorbed dose rate. To this end, 100 similar mathematical phantoms, which only differed in their thyroid mass, were created. Then, the thyroid was selected as the source of photon, electron and 131I, respectively, the absorbed doses to the thyroid and other organs were estimated using the MCNPX code. The results show when the mass increases, the amount of absorbed dose in the thyroid decreased. The power of this reduction for the energies between 0.01 and 4 MeV was in the ranges of (1/3 ≤ x ≤ 1) for photons and (2/3 ≤ x ≤ 1) for electrons. Finally, analyzing the statistical distribution of the doses, the coefficient of changes in the thyroid absorption dose for photon energies ranging from 0.01 to 4 MeV was 12-30%, for electrons in the same energy range, it was between 12-23%, and per decay of 131I, the figure turned out to be 19%. Moreover, the risk of a secondary cancer related to the non-consideration of the special body thyroid mass per 100 mCi (3.7 GBq) of the 131I radiopharmaceutical, was estimated to be 1.2%.