Operation
The electrons emitted from the cathode are accelerated toward the first dynode, which is maintained 90 to 100 V positive with respect to the cathode. Each accelerated photoelectron that strikes the dynode surface produces several electrons, that are then accelerated to the second dynode, which is held 90 to 100V more positive than dynode 1. For conventional dynode materials, such as BeO and MgO, a multiplication factor of 10 can normally be achieved by each dynode stage. By the time this process has been repeated at each of the dynodes, 105 to 107 electrons have been produced for each incident photon, dependent on the number of dynodes.
Read more about this topic: Dynode
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