Alpha particles and Teflon

  1. Oct 21, 2010 #1
    Hi there,

    I know that alpha particles will pass through gold foil if it is thin enough, but will alpha particles pass through a layer of teflon? If so, is there some way of knowing how thin the teflon should be for most alpha particles to pass through?
     
  2. jcsd
  3. Oct 21, 2010 #2
  4. Oct 22, 2010 #3
    Thanks! What about protons? Do you know how much of a material protons pass through?
     
  5. Oct 22, 2010 #4
    Here is a pay-per-view paper. You can find other papers by Googling proton range energy tables (or plots)
    http://www.sciencedirect.com/scienc...d14ea049e104a271f762ed8a4182daee&searchtype=a

    Here is the Lawrence Berkeley Lab Particle Data Group reference on Passage of Particles through Matter

    http://pdg.lbl.gov/2009/reviews/rpp2009-rev-passage-particles-matter.pdf

    THis includes the equation for the Bethe-Bloch dE/dx ionization energy loss. You will need to do a numerical integration to get proton range.

    There was a very old and complete set of proton range-energy plots, UCRL-2426, but I have not seen a copy for ~50 years.

    There are also programs such as GEANT4, available at http://geant4.cern.ch/

    Bob S
     
  6. Oct 22, 2010 #5
    Thank you. That is very thorough.
     
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