With the continuous progress of medical treatment, there are more and more ways to treat tumors, but many people have doubts and misunderstandings about the ability of iodine-131 to treat tumors. What do you not know about iodine-131 treatment? 1. What is iodine-131? Iodine-131 is the same as iodine in food, which is taken up by thyroid cells and used to synthesize thyroid hormone. The difference is that beta rays and gamma rays can be emitted. Beta rays mainly play a therapeutic role with fewer side effects, while gamma rays can be used for imaging examinations requiring radiation protection. 2.Who can receive iodine-131 treatment? Iodine-131 treatment can be used to treat hyperthyroidism, thyroid adenoma, thyroid cancer and other diseases. 3.What do patients receiving iodine-131 treatment need to pay attention to? In order to achieve good therapeutic effect and promote the absorption of iodine-131 from the lesion, patients need to stop using thyroid hormones and not consume or take iodine-rich food (seafood such as kelp, nori, seaweed, oysters) and drugs (amiodarone, enhanced CT contrast agent) for 3-6 weeks. 4. Do I need to be isolated after Iodine-131 treatment? There are national regulations on this issue: in principle, the dose in the patient’s body after iodine-131 treatment is less than 400 MBp (10.8 mCi). For patients who are hospitalized for iodine-131 treatment, doctors recommend that patients continue to be isolated at home for a period of time after discharge, and for thyroid cancer patients for 1-3 weeks. During the isolation period, contact with sensitive people such as infants, children and pregnant women for a long time (less than 1 meter) and for a long time (more than 30 minutes) should be reduced. 5.Does iodine-131 remain in the body? Most of the iodine-131 is excreted in the urine and faeces, and a small portion is excreted in sweat. Therefore, for patients treated with iodine-131, it is recommended to wash the close clothing separately 2 weeks after the treatment. Therefore, we should clear the misunderstanding of iodine-131 and perceive iodine-131 treatment rationally.