The half-life of iodine-131 is 8 days. Approximately how long would it take for 1 milligram of 1-131 to decay to 1/2 milligram of 1-131?

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If the amount of 1-131 is reduced by one-half every 8 days: 8 mg (8 days), 4 mg (8 days), 2 mg (8 days), 1/2 mg. It would take 32 days (approximately 1 month).

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