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Gamma-photon equivalent UV excitation of LYSO:Ce scintillator material

In positron emission tomography (PET) slab scintillator crystals based detector modules are subject of intensive research, because all the three coordinates of the scintillation (point of interaction, POI) can be determined by them. Experimental evaluation of these detectors is done by using collimated γ-radiation where only two of the three spatial coordinates can be controlled. Alternatively, highly-detailed simulations can be used to evaluate detector performance as a function of POI, but their validation requires again experimental techniques. We propose a model validation method based on point-like, UV excitation of LYSO:Ce scintillators. The excited fluorescent pulses are identical in many respects to a scintillation excited by γ-photons. We discuss the details of our γ equivalent UV excitation arrangement, as well as compare the characteristics of the resulting fluorescence to those of scintillation light.