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Scintillation Counters and Photomultiplier Tubes

           Definition of Photomultiplier Tube Gain

= average number of electrons generated at each dynode

  stage

Typically,  = 4 , but this depends on dynode material

  and the voltage difference between dynodes

n = number of multiplication stages

Photomultiplier tube gain = n

For n = 10 stages and  = 4 , gain = 410 = 1 107

This means that one electron emitted from the

  photocathode (these are called “photoelectrons”)

  yields 1 107 electrons at the signal output

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