Q.

From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is

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a

6 hours

b

12 hours

c

64 hours

d

128 hours

answer is B.

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Detailed Solution

After 6 half lives intensity emitted will be safe. =6 x 2 =12 hrs.
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From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is