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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

`12 h`

B

`24 h`

C

`6 h`

D

`130 h`

Text Solution

Verified by Experts

The correct Answer is:
a
For working safely, the activity must reduce to `(1)/(64)`
`(N)/(N_(0))=((1)/(2))^(n)=(1)/(64)`
`n=6`
`t= nt=6 xx 2= 12H`
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