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Homework Help: Finding the distance of a gamma ray travels in lead

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data
    The ‘half-thickness’ tells us the thickness of a given material needed to absorb half the incident photons from a particular source.

    Find the average distance of a gamma ray in lead before its first collision.

    I have a value for the half thickness (and equivalent half thickness) and the density of lead.

    2. Relevant equations

    3. The attempt at a solution

    I'm not sure how to go from the half thickness to a distance. Since this is the distance needed to absorb half the photons, is this also the average distance the photons will travel?
  2. jcsd
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