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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

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)) =(1/2)^(n) rArr 1/64 =(1/2)^(n) rArr n = 6`
After 6 half lives intensity emitted will be safe
Time = ` 6 xx 2= 12 ` hr .
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