The gamma rays carried by hyperthyroid patients after I-131 treatment are a source of radiation exposure to the surrounding population. However, the γ-rays released by I-131 only account for 1% of its total radiation, and the effect on the surrounding population is actually not significant. National regulations require hospitalization for I-131 treatment above about 10mCi dose, mainly to reduce the environmental pollution by radioactivity in the patient’s urine and fecal discharge, and the impact on family irradiation is not the main consideration. If the patient is surrounded by pregnant women or engaged in early childhood education, in order to avoid ambiguity for others, they can adjust their work position for a period of time after treatment, or they can rest at home, and usually the physician will also issue a diagnostic certificate. the effective half-reduction period of I-131 in the human body is 3.5-4.5 days, with an average of about 4 days, and short-term rest does not solve the radiation problem, for example, the 10mCi treatment dose that produces γ-rays The law allows 1uCi of radioactivity to exist in nature, which is the natural discharge standard for radioactive waste, and if you apply it to human beings reluctantly, i.e., 1 month after taking the drug, you are a normal person who can legally come and go as you please, and no one can object to your existence. .