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Can be used to detect single photons.
Richard Feynman likes them, he describes the tube at Richard Feynman Quantum Electrodynamics Lecture at University of Auckland (1979) at one point.
It uses the photoelectric effect multiple times to produce a chain reaction.

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  1. Photomultiplier
  2. Single photon production and detection experiments
  3. Photon
  4. Elementary particle
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