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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a
6 hr
b
12 hr
c
42 hr
d
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