Research On Modeling And Simulation Of Plastic Scintillator Detector Response Induced By Space Radiation Particles

Manned space exploration is one of the important measures for human beings to explore outer space.Space radiation environment has been an important incentive of the failure of the spacecraft.It is also a serious threat to the living body in outer space,including the astronauts.Building a suitable radiation particle detector and simulating the response of the space radiation particles and analyzing their characteristics are efficient methods to improve the equipment performance index.By these methods,space radiation environment can be estimated more accurately.It is of great significance to the sustainable development of China's manned space activities.In this paper,in order to study the particle transport process in the EJ-200 plastic scintillator,a simulation program EJ_Scint has been developed for the particle detection system,which is developed by using Monte Carlo method for radiation particles transport equation numerical simulation model.The program can simulate the detector response in different application conditions,as it can define the parameters of the incident source and the scintillator according to the actual requirements.Then the interaction and transport processes of particles in the scintillatorwere studied.In this paper,the responses caused by electrons and ? were simulated,and the simulation results were analyzed with corresponding experimental data to assess the performance parameters of the detector and provide improvement suggestions.Research and analysis of response caused by electronic indicates that the light collection efficiency and energy resolution can be improved by adjusting the reflection layer,the volume of the scintillator,the scintillator and the PMT coupling methods.Signal time difference is linearly related to the particle incident the position.Due to inter-system error,there was a tiny bias between the experimental results and simulation results.Simulation analysis was also carried out on the gamma ray energy deposition spectrum,the result shows that Compton edge is outstanding,Compton scattering and the cumulative effect is not obvious,which shows that the scintillator size is moderate,and the peek-flat form ratio falls as the incent energy rises.In addition,with the comparison of Compton edge and the measured spectrum,the energy deposition spectrum of corresponding photon was analyzed,which provides technical support for energy calibration of plastic scintillator detector in the laboratory.Besides,the radiation protection problem has been researched during the progress of analyzing the scintillator detector.By taking advantage of thedifferent characteristics of particles interact with the material,a method of layered protective was put forward in this paper.The simulation result of this method shows good protection effect,thus the method is being used in the laboratory.