A freshly prepared radio active source of half life 2 hr 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

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An Intiative by Sri Chaitanya

answer is 2.

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Detailed Solution

If A be the activity at safe level, ThenAA0=12n ⇒ 164=12n ⇒ n=6 ⇒nt1/2=12hr.

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