Radioactive iodine is used to diagnose and treat diseases of the thyroid gland. The half-life of iodine-125 is 60 days. The half-life of iodine-131 is 8 days. Keeping in mind that overexposure to radiation is harmful, which of these isotopes would be the best to use? Explain your answer.
Iodine-131 is better to use because it has a shorter half-life. The patient will receive less dose of radiation because of less period of action.
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