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Radioactive iodine is typically used in thyroid tests, including a thyroid scan. Your thyroid and most types of thyroid cancer absorb iodine naturally. The radioactive iodine builds up in your thyroid tissue. A gamma camera or scanner detects the radioactive emissions.
The gamma probe measures how much radioactive iodine the thyroid has absorbed at the time of the scan. You will excrete the radioactive iodine in your urine for 24 to 48 hours after the test. The amount of radioactive iodine used in an RAIU scan is so small that you wonât need to take any precautions.