Answer
Iodine-131 is utilized in medical applications, particularly for the treatment of thyroid-related conditions. Its therapeutic effect is primarily aimed at reducing overactivity in the thyroid gland, a condition commonly known as hyperthyroidism. By administering a controlled dose of iodine-131, it selectively targets and destroys overactive thyroid cells, bringing hormone production back to normal levels. This targeted approach effectively manages hyperthyroidism and restores proper thyroid function.