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Medical Term:

photoelectric effect



  1. the loss of electrons from the surface of a metal on exposure to light;
  2. a mode of interaction of radiation with matter in which all of the energy of the incident photon is absorbed, with ejection of a photoelectron and characteristic radiation from filling the vacancy from another shell; since the energy absorption per gram of tissue is proportional to the cube of the atomic number, this mode is important in diagnostic radiography.
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