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  • photomultiplier tube (PMT) A tube consisting of an evacuated envelope with a photocathode that emits electrons when exposed to light. These electrons are accelerated by a positive electrostatic field and fall upon a metal surface where they emit secondary electrons that are...
  • photocathode An electrode used to release photoelectric emission when irradiated, making it then the irradiated negative electrode of a phototube.
  • phototube An electron tube having a photocathode for the emission of a photoelectric current.
  • photocell
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