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"Uses"
"Iodine-131 (131I or I-131) is a radioisotope of iodine, which is used in the diagnosis, treatment and theranostic approach (diagnostic scan and radionuclide therapy 3 ) of thyroid lesions. It is one of the oldest radiotracers used in nuclear medicine, in use for over 50 years. It is predominately used in thyroid ablation therapy, for patients post-thyroidectomy, and for metastatic thyroid cancer."
"The use of radioiodine in clinical practice was introduced in the 1940s by Saul Hertz, MD and director of the thyroid unit of Massachusetts General Hospital 4."