A scintillator can include a photosensor surface and a side surface adjacent to the photosensor surface. The photosensor surface can be adapted to provide scintillating light to a photosensor. In an embodiment, the scintillator can have grooves along the side surface, wherein the grooves have lengths extending in a direction toward the photosensor surface. In another embodiment, the scintillator can include a reflector and a clear adhesive between the scintillator and reflector. In a particular embodiment, the reflector is substantially white and has a gloss value of at least 50. The scintillator can be in the form of a scintillator element of an array or in the form of a single scintillator. The scintillator can be coupled to a photosensor within a radiation detection apparatus. For an array, a process of forming the array can include forming grooves along one or more side surfaces during a fabrication process.