NEET Physics Nuclei Questions Solved

A freshly prepared radioactive source of half life 2 hrs emits radiations of intensity which is 64 times the permissable safe level. The minimum time after which it would be pos- sible to work safely with this source is (A) 6 hrs (C) 24 hrs (B) 12 hrs (D) 128 hrs (SCRA 1996)
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