Radioiodine is a radioactive isotope of iodine that is commonly used in medical treatments. There are several synonyms for the term "radioiodine," including iodine-131, Radionuclide Iodine, and I-131. These terms are frequently used in medical literature and healthcare settings when referring to the use of radioiodine for diagnostic or therapeutic purposes. Radioiodine is commonly used to treat thyroid disorders such as hyperthyroidism and thyroid cancer, as it targets and destroys cells in the thyroid gland. Other synonyms for radioiodine may include radioisotope iodine, radiolabeled iodine, and I-131 therapy, among others. These terms are all used interchangeably and refer to the same radioactive isotope of iodine.