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photoelectric effect

 

Definition:

  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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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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