塑料闪烁体探测器衰减长度特性的蒙特卡罗模拟研究

he purpose of the study is to explore systematically attenuation length features in the process of the photon with plastic scintillator response with Monte Carlo algorithm. Combining with the control variable method, the four types of influencing factors of the optical surface type, cross-sectional area, reflective material and surface roughness of the plastic scintillator are simulated and analyzed one by one, and the attenuation length changes with the factor. Then, using the interval subdivision method, the plastic scintillator is divided into several equidistant intervals according to the distance. The distribution characteristics of the attenuation length in each interval are compared, and the general law of the attenuation length in the interval subdivision method is summarized. The results show that polishedbackpainted polygon has the best light collection efficiency under the same conditions, and the attenuation length decreases with the increase of cross-sectional area, reflectance coefficient and surface roughness. At the same time, the attenuation length varies continuously in the direction of the scintillator interval, and the attenuation law is not a simple exponential law, but the attenuation law of compound type. This simulation study has a high reference value for the experimental design of plastic scintillator detectors.