A hospital patient has been given 131i half life 804 days, Ask an Expert

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A hospital patient has been given 131I (half life= 8.04 days) which decays at 4.5 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptable level? Assume that the material merely decays and is not excreted

1. 7.6 days

2. 17 days

3. 12 days

4. 8.4 days

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