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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 h

B

12 h

C

24 h

D

128 h

Text Solution

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The correct Answer is:
B
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