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Scintillation Counters and Photomultiplier Tubes

     The phototube base and high voltage supply

Purpose -- provide an electric field between

photocathode and first dynode

successive dynodes

to accelerate electrons from stage to stage

About 100 V voltage difference needed between stages

Chain of resistors forms voltage divider to split up

  high voltage into small steps

Capacitors store readily-available charge for electron

  multiplication

Typical base draws 1 - 2 milliamperes of current

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