0 X-ray photon interaction with matter

X-ray photon interaction with matter can occur in various forms:

  • Photoelectric effect {low energy photon (energy just greater than binding energy of electron) interacts with innermost shell electron}- MCQ
    • directly proportional to atomic number of matter
    • inversely proportional to cube of incident photon energy
    • maximum with tightly bound electrons (i.e. innermost shell - K)
  • Compton scattering/effect
    • is the cause of scatter radiation and thus increase radiation dose
    • does not depend on atomic number
    • inversely proportional to photon energy
  • Coherent scattering
  • Pair production (not important in diagnostic radiology)

Author: Dr Ayush Goel


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