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Real size detectors
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When a gamma-ray photon travels within a detector, the detector output signal depends on the location of the interactions inside the detector and the size of the detector. 

If the incident gamma-ray energy is above 1022 keV pair production events can occur, which depending on the size of the detector mean that single or double escape peaks may arise along with the full energy peak, the Compton continuum and the pair production peak at 511 keV.

Have a go Investigate the effect of the size of the detector by selecting each of the options below to show the interactions in the detector and the resulting energy spectrum:

  small detector |     large detector  |    real detector 











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