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Scintillation Counters and Photomultiplier Tubes

Schematic drawing of a photomultiplier tube

Photons eject

electrons via

photoelectric effect

Photocathode

(from scintillator)

Each incident

electron ejects

about 4 new

electrons at each

dynode stage

Vacuum inside

tube

“Multiplied” signal

comes out here

An applied voltage

difference between

dynodes makes

electrons accelerate

from stage to stage

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