Clothes worn by patients discharged from the hospital after iodine 131 treatment can be placed in an unused room or in a sealed bag to allow the radioactive iodine on the clothes to gradually decline. Since the radioactive substances in the body of patients after iodine 131 treatment may be excreted through sweat and other bodily fluids, a small amount of radioactive substances may be present on the clothes, which can be placed in an unused room or sealed bag and left for a period of time until the radioactive iodine on the clothes declines. In addition to this, care should be taken to avoid contact with special populations such as pregnant women and children after undergoing iodine radiation therapy. If you are not sure about the precautions to be taken after undergoing iodine 131 treatment, you can go to the hospital and consult a professional doctor.