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
single or double
escape peaks may arise along with the
energy peak, the
production peak at 511 keV.
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