4. Which sample will decay least over a period of 30 days? [Refer to Reference Table N]
1. 10 g of Au-198
2. 10 g of I-131
3. 10 g of P-32
4. 10 g of Rn-222
Expaination -The substance with the longest half-life, P-32 in this problem, will decay the least in 30 days.
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