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Homework Help: Linear attenuation coefficient

  1. Mar 14, 2015 #1
    1. The problem statement, all variables and given/known data
    This i self study!
    Hi, How thick should a foil made from absorber II be to give the same absoption as 1mm thick foil made from absorber I for xrays with energy 5X106

    xray beam passing through an absorption material it is attenuated , this is given by

    I/Io e-ax

    io =initial intensity of the beam
    i=intensity of beam from absorber taken as average amount of photons emerging from 1cm2
    x=thickness of slab of absorbing material in cm-1
    a=linear attenuation material

    table photon energies 5X106
    absorber 1 .4
    absorber 2 .2

    2. Relevant equations

    linear attenuation coefficient=% reduced/thickness of absorber

    3. The attempt at a solution

    used logs to find x

    tried to use linear attenuation coefficient
    but really got stuck on what to do
  2. jcsd
  3. Mar 14, 2015 #2
    I/Io= e-ax
  4. Mar 14, 2015 #3
    I/Io =e-ax
  5. Mar 14, 2015 #4
    i go t an answer of 2mm because ax value where a is halved so x is doubled to keep same forumla
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