Like iodine pills?
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Radioactive iodine is used in treatment for thyroid cancer, where basically all of the thyroid tissue is being destroyed. Almost all iodine in the body is absorbed by the thyroid and hardly any of the other parts of the body. By giving a patient a radioactive iodine pill, any remaining thyroid tissue (after surgery to remove the thyroid), takes up that radioactive iodine, which then kills the remaining thyroid tissue, along with the cancer.
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