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Question

A freshly prepared radioactive source of half-life 2h emits radiation of intensity which is 64 times the permissible save level. The minimum time after which it would be possible to work safely with this source is

A
6 h
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B
12 h
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C
24 h
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D
128 h
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Solution

The correct option is A 12 h
The number of half lives required to decay to permissible decay is n=log264=6
Total time, T=6×2h=12h

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