Dynode

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Dynodes in a photomultiplier

A dynode is an electrode from a series of individual electrodes in a photomultiplier .

An acceleration voltage is applied across the entire series of dynodes , so that the voltage divided according to the number between a pair drops and electrons are accelerated from dynode to dynode. If an electron hits the surface of a dynode, further electrons are emitted and the current is increased.

A dynode fulfills the properties of both a cathode and an anode , since it emits and absorbs electrons.