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Energy limits of gamma rays

  1. Aug 15, 2007 #1
    Hello you guys. I was wondering about the energy limits of the gamma rays. I allready know that the gamma ray spectrum varies from some MeV to 50 MeV (approximately). Does anyone know how can these limits be justified?
  2. jcsd
  3. Aug 15, 2007 #2


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    The lower limit of gamma ray energy is basically a matter of definition. X-rays are the next lower type and the boundary is somewhat arbitrary One way of defining might be when coherent scattering (X-ray) is more important than Compton (gamma).

    There is no defined upper limit. It is merely a question of what is physically possible.
  4. Aug 15, 2007 #3


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    The distinction betwen hard X-rays and gamma rays is usually taken be their origin. Gamma rays are generated by nuclear decays, while hard X-rays are produced by man-made electronics.

    There is no upper limit on gamma-ray energy, though the GZK cutoff is a limit on the energy of gamma rays which are able to survive long travels across the universe.

    - Warren
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