Studies of Scintillation Mechanism and Proportionality Curve by Rate Equations

Abstract

A high energetic electron deposits energy in scintillator materials by the creation of electron-hole pair order of 1020 but we get the light output Photon order of 104.There are subsequent linear and nonlinear interactions involve within the materials.The radiative recombination has a non linear relation with the created primary electron energy. This non- proportionality relation reduces the scintillation resolution. We use here a system of coupled rate equations and apply it to scintillator LaBr3:Ce, CSI and NaI at Room temperature.The model is solved considering the transportation path of the carriers as cylindrical and the results are compared of these materials and total light yield for those materials. The space and time distributions of carriers have been studied to examine the response of non-proportionality. This study will give a detailed theoretical insight of the scintillator mechanism which will help to discover and fabrication of a smart scintillator with both a high light yield, better-energy resolution, small non-proportionality, and fast rise and decay time.