Scintillation Parameters of a Phoswich β- and γ-Ray Detector

The effect of the design features of a composite scintillation detector on the value and stability of its light yield under its exposure to both β-particles and γ-rays was investigated. The phoswich detector was manufactured from a NaI(Tl) single crystal and scintillation polystyrene-based plastic. The light yield was measured in the detectors of a differing design. Comparing the experimental results with the simulation data, it was possible to trace the mechanism of light-signal formation in the phoswich. Some proposals were designed that helped improve the following performance data of a scintillation β- and γ-ray detector: the light yield and its stability, pulse-height resolution, and peak-to-valley ratio.