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dynode
(redirected from dynodes)

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dynode
[dī′nōd]
one of a series of platelike elements that amplify electron pulses in a photomultiplier tube. Each electron that strikes a dynode causes several secondary electrons to be emitted. The dynode gain is the ratio of the number of secondary electrons to the number of incident electrons.


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A photomultiplier tube consists of a photo-emissive cathode and a series of dynodes in an evacuated glass enclosure.
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The noise is then reduced to unavoidable dark currents due to the amplifying voltage between the cathode and the dynodes.
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The electrons are amplfied (caused to increase in number) by a chain of dynodes in process called "stimulated emission," producing a "shower" of electrons that makes an electrical pulse.
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