Final answer:
Radioactive Iodine (RAI; Sodium iodide 131) is used in the diagnosis and treatment of thyroid cancer by targeting and destroying excess thyroid tissue or cancerous cells. It emits radiation that can be used to image the thyroid gland and detect any abnormalities.
Step-by-step explanation:
The MOA (mechanism of action) for Radioactive Iodine (RAI; Sodium iodide 131) involves the use of radioactive iodine-131 in the diagnosis and treatment of thyroid cancer. The thyroid gland in the neck absorbs iodine, and an overactive thyroid gland will also absorb the radioactive iodine, which can destroy excess thyroid tissue or cancerous cells. The radioactive iodine emits radiation, which is used to image the thyroid gland and detect any abnormalities. The half-life of iodine-131 is approximately 8 days, so it is eliminated from the body relatively quickly.