Iodine-131 is mainly used to treat hyperthyroidism and thyroid cancer. Patients treated with iodine-131 generally do not release radiation outside the body, so there is generally no radiation residue in the bed used by patients treated with iodine-131. Iodine-131 has its own radiation. After patients take it, it can release beta rays in the body, and there is a half-life of iodine-131. The dose can be decayed by half after about 40 hours, and after about 40 hours again, it will be reduced by half again until it drops to the safe range, and then it is excreted out of the body through metabolism. Therefore, the radiation effect of iodine-131 is only localized in the body and does not reach outside the body, and no residue is produced in the room where the patient has lived. In addition, for safety reasons, it is best for patients to avoid contact with infants, children and pregnant women in the near future after iodine-131 treatment. Daily necessities in life are used separately and in conjunction with a balanced diet to regulate their physical condition to promote recovery.