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Homework Help: Gamma-Ray Attenuation in Matter

  1. Dec 10, 2016 #1
    1. The problem statement, all variables and given/known data
    Hi, I am trying to solve for the cross section for a gamma ray energy. The element I am using is Europium and the energy peak is 244.7 keV. From the slope of the graph I was able to determine the mass attenuation coefficient to be 8*10^-5 m^2/kg

    2. Relevant equations
    σ=(μ*A) / N

    A- molar mass of the element
    μ- mass attenuation
    N- Avogadro's number
    σ- cross section

    3. The attempt at a solution
    σ= ((8*10^-5)(63)) / (6.023*10^23)

    The solution to this seems very small.. I think that the equation that I am using should involve the energy peak... Any thoughts?? Thanks
  2. jcsd
  3. Dec 12, 2016 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Check your units.

    What do you mean by "very small"? Compare it to the typical size of a nucleus.
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