Iodine that answers the body is stored in the thyroid gland from which is released to control growth and metabolism the thyroid can be managed if Iodine-131 is injected into the body in larger doses I-133 is also used as a means of treating cancer of the thyroid .I-131 Has a half-life of 8.7 days and decay is by beta emission how long will it take for 63.1% of a dose of I-131 to decay express your answer in days as three significant digits

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