Iodine-131 (or I-131) is a radioactive substance that emits both beta and gamma radiation and has a half-life of 8.03 days. Under normal circumstances, there are low levels of I-131 present in the ...

Radioactive iodine (I-131) can be used in medical therapies as a treatment and a diagnostic tool. It is most commonly used in the treatment of hyperthyroidism due to Graves’ disease or a nodule in the ...