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A freshly prepared radioactive source of...

A freshly prepared radioactive source of half-life `2 h` emits radiation 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)) :. N = 6` Thus total time `= 2xx 6 = 12hr`
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