Positioninsensitive detectors

Position-insensitive (non-imaging) detectors have played a significant role in astronomy. They do not record the location of an impinging photon. Two such detectors are briefly described here, the photomultiplier tube and the basic proportional counter. The former is for optical radiation and the latter for x rays. Each converts the incoming photon to an electron via the photoelectric effect. Multiplication of electron number within the detector then yields sufficient charge to be recorded by conventional electronics.

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