33 Common Radioactive Isotopes Used in Medicine
Therefore, the two radioactive isotopes are used together to detect the heart damage. Iodine-131 (I-131) is absorbed primarily by the thyroid, liver and certain parts of brain. Therefore, I-131 can be used to detect damage to the thyroid, liver, and to detect a brain tumor. Iodine-123 (I-123) is another radioisotope of iodine.
