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Photomultiplier tubes are broadly divided into two types: a side-on type and a head-on type. The head-on type, also called the end-on type, receives incident light through the end of the glass bulb. It has a transmission mode photocathode deposited directly on the inner surface of the light input window and provides better spatial uniformity than the side-on type which uses a reflection mode photocathode. The head-on type also features a choice of photosensitive areas ranging from a few dozen square millimeters to several hundred square centimeters.
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