Geng Changran, Tang Xiaobin, Qian Wei, Guan Fada, Johns Jesse, Yu Haiyan, Gong Chunhui, Shu Diyun, Chen Da
Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, People's Republic of China. Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou 215123, People's Republic of China. Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, 02114, USA.
J Radiol Prot. 2015 Sep;35(3):707-17. doi: 10.1088/0952-4746/35/3/707. Epub 2015 Sep 7.
The S values for the thyroid as the radioiodine source organ to other target organs were investigated using Chinese hybrid reference phantoms and the Monte Carlo code MCNP5. Two radioiodine isotopes (125)I and (131)I uniformly distributed in the thyroid were investigated separately. We compared our S values for (131)I in Chinese phantoms with previous studies using other types of phantoms: Oak Ridge National Laboratory (ORNL) stylized phantoms, International Commission on Radiological Protection (ICRP) voxel phantoms, and University of Florida (UF) phantoms. Our results are much closer to the UF phantoms. For each specific target organ, the S value for (131)I is larger than for (125)I in both male and female phantoms. In addition, the S values and effective dose to surrounding face-to-face exposed individuals, including different genders and ages (10- and 15-year-old juniors, and adults) from an adult male radioiodine carrier were also investigated. The target organ S values and effective dose for surrounding individuals obey the inverse square law with the distance between source and target phantoms. The obtained effective dose data in Chinese phantoms are comparable to the results in a previous study using the UF phantoms. The data generated in this study can serve as the reference to make recommendations for radiation protection of the Chinese patients or nuclear workers.
使用中国混合参考体模和蒙特卡罗代码MCNP5研究了甲状腺作为放射性碘源器官对其他靶器官的S值。分别研究了均匀分布在甲状腺中的两种放射性碘同位素（125）I和（131）I。我们将中国体模中（131）I的S值与之前使用其他类型体模的研究进行了比较：橡树岭国家实验室（ORNL）的理想化体模、国际放射防护委员会（ICRP）的体素体模和佛罗里达大学（UF）的体模。我们的结果与UF体模更为接近。对于每个特定的靶器官，在男性和女性体模中，（131）I的S值均大于（125）I的S值。此外，还研究了成年男性放射性碘携带者对包括不同性别和年龄（10岁和15岁青少年以及成年人）的周围面对面暴露个体的S值和有效剂量。靶器官S值和周围个体的有效剂量与源体模和靶体模之间的距离遵循平方反比定律。在中国体模中获得的有效剂量数据与之前使用UF体模的研究结果具有可比性。本研究生成的数据可为中国患者或核工作人员的辐射防护建议提供参考。
