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放射性碘在正常甲状腺中含量为血浆中浓度的20倍,甲亢时,这个比值可升高数百倍,碘在病变腺体结节中代谢速率降低,且甲状腺的放射敏感性也增高.实验证明,使甲状腺上皮出现营养不良的最小吸收剂量为0.3Gy.剂量为0.27～2.7Gy时,1年后,甲状腺结构几乎完全恢复,但27Gy或更高剂量时,1年后,器官的形态仍相当于局部或亚全部放射性切除.300Gy或更高剂量照射2周后,器官全部破坏.10～300Gy剂量可导致器官迅速损伤,
Radioiodine in the normal thyroid content of 20 times the plasma concentration, hyperthyroidism, this ratio can be increased hundreds of times, iodine in the lesion gland nodules metabolic rate decreased, and thyroid radiosensitivity also increased.Experimental evidence , So that the minimum absorbed dose of thyroid epithelial malnutrition is 0.3 Gy.At the dose of 0.27 ~ 2.7Gy, the thyroid structure almost completely recovered after 1 year, but at 27Gy or above, Partial or sub-total radioactive resection .300 Gy or higher doses of irradiation after 2 weeks, organ damage .10 ~ 300Gy dose can lead to rapid organ damage,