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Homework Help: Counting gamma rays

  1. Aug 22, 2012 #1
    1. The problem statement, all variables and given/known data
    A detector is used to count the number of gamma rays from a radioactive source if the number of counts is 10000 in exactly 20 secs then what is the error in counting rate per sec?

    2. Relevant equations- no idea.

    3. The attempt at a solution- As per our syllabus we had only done Geiger muller counter which gives a dead time & from that we can calculate the error. However that is not given here. SO I got no idea to approach. Please help.

    Options given- 5%, 22.4%, 44.7%, 220% (absolute values all).
    Question source TIFR GS 2010.
  2. jcsd
  3. Aug 22, 2012 #2

    Simon Bridge

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