Energy-Dependent Scintillation Pulse Shape and Proportionality of Decay Components for CsI:Tl: Modeling with Transport and Rate Equations

In a spectroscopic gamma-ray scintillation detector, hot and thermalized transport, trapping, and recombination in multiple kinetic orders set the performance characteristics on which security, physics, and medical applications depend. CsI:Tl is the classic scintillator, yet even in it the details of these processes are still not fully understood. In this study, computational modeling reveals the origins of both recent and old observations about the spatial and temporal characteristics of the carrier interactions. This insight allows for improved material engineering of spectroscopic radiation detectors.