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A freshly prepared radioactive sample of half life time 2 hr emits radiation which is 64 times the permissible safe level of dose. The minimum time after which it would be possible to work safely with the source is
1. 6 h
2. 12 h
3. 24 h
4. 128 h

Deepak Patra , 11 Years ago
Grade upto college level
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