Fig. 2From: Coincidence energy spectra due to the intrinsic radioactivity of LYSO scintillation crystalsExamples of coincidence events between two opposing crystals due to the natural radioactivity of LYSO scintillation crystals. The crystal on the left is the source crystal, while its opposite is the detector crystal. The top and bottom rows show examples of events considered and not considered, respectively, in the analytical modelBack to article page