A freshly prepared radioactive source of half-time 2h emits radiatio – McqOptions

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1.	A freshly prepared radioactive source of half-time 2h emits radiation of intensity which is 64 times the permissible safe level. Minimum time after which it would be possible to work safely with this source is which of the following?
A.	6 h
B.	12 h
C.	24 h
D.	20 h
Answer» C. 24 h

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