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Photon Energy and Compton

  1. Jul 12, 2004 #1

    Mc?

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    The textbook used in an x-ray physics class states that:

    1) The probability of compton interactions occurring in tissue decreases with increasing photon energy (1/e)

    2) The probablity of Photoelectric (PE) interactions occurring in tissue decreases with increasing photon energy by 1/e cubed.

    3) The number of compton interactions relative to PE increases with increasing photon energy based on the relationship of 1/e to 1/e cubed

    The author then gives a table that list the percentages of compton and PE interactions at various kVp settings that states:

    a) At 50 kVp, >99% of the photons are absorbed and 21% of the interactions are compton

    b) At 100 kVp, 96% of the photons are absorbed and 63% of the interactions are compton

    Based on the information in the table it appears the actual number of Compton interactions will increase with an increase in photon energy.

    100 Photons produced @ 50 kVp - 99% absorbed and 1 transmitted - 20.8 Compton (21% of 99)

    100 photons produced @ 100 kVp - 94 absorbed and 6 transmitted - 59 Compton (63% of 94)

    What does increasing photon energy do to the actual number of compton interaction occuring in tissue?

    Thank you.

    Mc?
     
  2. jcsd
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