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  3. A freshly prepared radioactive source of half-life 2 hrs emits radiation of intensity which is 64 times the permissible safe level. The minimum time a

. A freshly prepared radioactive source of half-life 2 hrs emits radiation of intensity which is 64 times the permissible safe level. The minimum time a

(a) 6 h    (b) 12 h  (c) 24 h  (d) 128 h

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