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Scintillation Counters and Photomultiplier Tubes

Photocathode composition

Semiconductor material made of antimony (Sb) and

         one or more alkalai metals (Cs, Na, K)

Thin, so ejected electrons can escape

Definition of photocathode quantum efficiency, 

             Number of photoelectrons released

=

             Number of incident photons () on cathode

Typical photocathode quantum efficiency is 10 - 30%

Photocathode response spectrum

Need for matching scintillator light output spectrum with

  photocathode response spectrum

The Photocathode

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