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A freshely prepared radioactive source o...

A freshely prepared radioactive source of half 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

A

6 hours

B

12 hours

C

24 hours

D

128 hours

Text Solution

Verified by Experts

The correct Answer is:
b
`N=N""_(0)/64=N""_(0)/2""^(6)thereforen=6`
Thus total time=`2xx6=12` hr.
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