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AIIMS AIIMS Solved Paper-2014

  • question_answer
    A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Calculate, the minimum time after which it would be possible to work safely with this source.

    A) 12h                                        

    B) 24 h

    C) 6 h                                         

    D) 130 h

    Correct Answer: A

    Solution :

                    For working safely, the activity must reduce to \[\frac{1}{64}\] \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}=\frac{1}{64}\] n=6 \[t=nt=6\times 2=12h\]


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