scintillation counterArticle Free Pass scintillation counter,
radiation detector that is triggered by a flash of light (or
scintillation) produced when ionizing radiation traverses
certain solid or liquid substances (phosphors), among which are
thallium-activated sodium iodide, zinc sulfide, and organic
compounds such as anthracene incorporated into solid plastics or
liquid solvents. The light flashes are converted into electric
pulses by a photoelectric alloy of cesium and antimony,
amplified about a million times by a photomultiplier tube, and
finally counted. Sensitive to X rays, gamma rays, and charged
particles, scintillation counters permit high-speed counting of
particles and measurement of the energy of incident radiation.
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