Photomultiplier Tube

Photomultiplier Tube

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Credit: GIPHOTOSTOCK/SCIENCE PHOTO LIBRARY

Caption: Photomultiplier tube (PMT) is a vacuum tube that is used for extremely sensitive light detection. When light strikes the photocathode, free electrons are produced a consequence of the photoelectric effect. These electrons are accelerated in the electric field and directed to a series of dynodes, where electrons are multiplied through the effect of secondary emission. When the electrons reach the anode, a current spike is produced and detected. Shown here is a circular-cage type PMT produced by Hamamatsu.

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Keywords: detector, electron, light, optics, photocathode, photoelectric effect, photoelectron, photomultiplier, photon, photonics, physics, pmt, science, scientific, secondary emission, still life, technology, tube, vacuum

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