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
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