SCINTILLATION COUNTER Radiation DetectorsSummaryThe operation of scintillation counters is summarized below.Scintillation Counter SummaryRadiation interactions with a crystal center cause electrons to be raised to anexcited state.When the center de-excites, the crystal emits a photon in the visible light range.Three classes of phosphors are used: inorganic crystals, organic crystals, andplastic phosphors.The photon, emitted from the phosphor, interacts with the photocathode of aphotomultiplier tube, releasing electrons.Using a voltage potential, the electrons are attracted and strike the nearest dynodewith enough energy to release additional electrons.The second-generation electrons are attracted and strike a second dynode,releasing more electrons.This amplification continues through 10 to 12 stages.At the final dynode, sufficient electrons are available to produce a pulse ofsufficient magnitude for further amplification.IC-06 Page 48 Rev. 0
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