Answer:RAI is a radioactive form of the more common iodine that can be found in foods (especially shellfish). Thyroid cells take up iodine much more than any other cell in the body in order to make thyroid hormone. When RAI is taken up by the thyroid, the radioactive iodine destroys the thyroid cells. In cases of thyroid cancer, RAI can reduce the chance that thyroid cancer will come back. In cases of papillary thyroid cancer, RAI ablation is recommended if the tumor is over 4 cm in size, extends beyond the borders of the thyroid gland, has spread to the lymph nodes, or if the tumor has spread outside of the neck. RAI is usually not recommended if the cancer is less than 1 cm in size and if there is no evidence of cancer outside the thyroid.
Explanation:
