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A freshely prepared radioactive source o...

A freshely prepared radioactive source of half 2 hours emits radiations 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 hours b)12 hours c)24 hours d)128 hours

A

6 hours

B

12 hours

C

24 hours

D

48 hours

Text Solution

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The correct Answer is:
b
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OP TANDON-RADIOACTIVITY AND NUCLEAR TRANSFORMATION -OBJ - A
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