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905 Series NaI(Tl) Scintillation Radiation Detectors

A gamma ray interacting with a scintillator produces a pulse of light that is converted to an electrical pulse by a photomultiplier tube (PMT). The PMT consists of a photocathode, a focusing electrode, and 10 or more dynodes multiplying the number of electrons impinging on each dynode. A string of resistors typically located ata set of tube basepluggable polarizes the anode and dynodes. Complete sets including scintillator and PMT are available.
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