Circuit forms gamma-photon detector

Posted on Aug 17, 2012

The circuit of Figure 1 includes a PIN photodiode that detects individual photons of gamma radiation. The reverse bias on the photodiode sometimes creates a depletion region. When such a photon strikes this depletion region, a small amount of charge develops. This charge is proportional to the photon`s energy. Four amplifiers following the PIN photodiode amplify and filter the resulting signal. A final comparator distinguishes between the signal and the noise. Thus, the comparator`s output pulses high each time a gamma photon with sufficient energy strikes the photodiode.

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