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

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6 hr

12 hr

42 hr

128 hr

answer is B.

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Detailed Solution

NN0=12t/T or 164=12t/T or 126=12t/T or tT=6 t=6T or t=6×2=12

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