RAI, or Radioactive Iodine, is a form of iodine that emits radiation. It is commonly used in medical treatments, particularly for conditions related to the thyroid gland, such as hyperthyroidism and certain types of thyroid cancer. RAI therapy works by targeting and destroying overactive thyroid cells, helping to restore normal thyroid function. In addition to its medical applications, RAI is also used in diagnostic imaging. It can help doctors assess thyroid function and detect abnormalities. The use of RAI in both treatment and diagnosis highlights its importance in modern medicine, particularly in managing thyroid-related health issues.