Nuclear Physics and RadioactivityMedium
Question
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 -
Options
A.6 h
B.12 h
C.24 h
D.128 h
Solution
64 = 26
After 6 half lives activity will become = 1/64
Hence required time = 6 × 2h = 12h.
After 6 half lives activity will become = 1/64
Hence required time = 6 × 2h = 12h.
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