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[" (C) more than half the active nuclei ...

[" (C) more than half the active nuclei decay "(D)" all the nucled decay "],[" A freshly prepared radioactive source of half-life "2h" 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 - "],[[" (A) "6h," (B) "12h," (C) "24h," (D) "128h]]

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