Mary Johnson is undergoing radioactive iodine therapy for her Graves' disease. Complete the following statements with the most appropriate term. Radioactive iodine therapy works by ______ the thyroid tissue, thereby reducing thyroid hormone production. After receiving radioactive iodine therapy, Mary should avoid close contact with pregnant women and young children for _____ days. Mary should be advised to use _________ precautions, such as flushing the toilet twice and washing her hands thoroughly after using the bathroom, to avoid contaminating others with radioactive material.