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Homework Help: Absorption of Photons question

  1. Dec 6, 2007 #1
    [SOLVED] Absorption of Photons question

    Radiation of equal intensities of 0.3 A X-rays (Ua=0.3 1/mm) and 0.5 A x-rays (Ub=.72 1/mm) are incident on a material. Find the thickness of the material if, in the emerging radiation, the 0.3 A x-rays are twice as intense as the 0.5 A x-rays.

    The only equation I have for this is I= Io e^(-Ux)

    Thanks for any help on where to start or an equation to use.
  2. jcsd
  3. Dec 6, 2007 #2
    just build up a system of equations relating the penetration deept of the radiation in the material and the extiction coefficents for both materials an set one intensity to half the other :)
  4. Dec 6, 2007 #3
    Thanks for the help.
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