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Iodine-131 is used in the treatment of thyroid disease. What is the half-life of iodine-131 if a 160-mg sample became 5 mg after 40 days?

Iodine-131 is used in the treatment of thyroid disease. What is the half-life of iodine-131 if a 160-mg sample became 5 mg after 40 days?

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