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How to absorb a characteristic line in the spectrum

  1. Jun 15, 2013 #1
    I have an x-ray tube. When I see the spectrum, I notice the characteristic lines of the anode. What do I have to do if I want to absorb a characteristic line?

    I have thought that I can add a filter. But.. which filter? Should it be an element such that the bound energy for the K-shell electrons is minor of the energy of the characteristic line that I want to absorb?

    In this specific case:
    I have an x-rays tube with a anod in molybdenum. In the spectrum, I see the caracteristic lines k_alpha=63 pm and k_beta=71 pm.

    I want to filter the k_alpha line much more than the k_beta line.

    Which filter do I have to use?

    Zr, E_k=18 kev

    Nb, E_k=18.99 kev

    Mo, E_k=20 kev

    According to what I previously said, I'd choose Zr and Nb. Do you agree with me?

    Thanks a lot!
  2. jcsd
  3. Jun 17, 2013 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    This is an emission line we are talking about, and you don't want it in the spectrum?
    Then why not take a background spectrum and subtract it from the final data spectrum.

    Or do you want to preferentially detect that line?
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