基于蒙特卡罗法的放射测量系统建模与仿真实现

Modeling and Simulation of Radiation Measurement System Based on Monte Carlo Method

基于蒙特卡罗方法,通过对伽马射线与物质相互作用、放射源、测量电子学系统和防护材料等建模,构建放射线探测与电脉冲产生的物理数学模型,进行模拟数据采集算法程序实现,并结合适当的测量系统场景仿真模型,交互式完成放射线测量数据的模拟采集以及后续的能谱处理。该仿真系统可虚拟仿真单道脉冲幅度分析测量和计算机多道测量实验,可实现混合源、未知源或自定义放射源在不同尺寸晶体下的能量、活度和能谱测量实验项目;可开展铅当量和半价层测量、不同材料防护性能测量评价等实验项目;可用于放射测量仪器开发和测试校准,未知放射源能谱比对等。

A method is applied to build a virtual simulation radiometric measurement system.The mathematical and physical models of gamma ray interaction with matter,radiation sources,measurement electronics system and protective materials are constructed by using Monte Carlo method.Through numerical calculation and scene simulation of the radiation measurement system,virtual simulation acquisition and energy spectrum processing of radiation measurement data are realized.It,the system,can simulate single channel measurement and computer multi-channel measurement experiments.It can realize energy measurement,activity measurement and energy spectrum measurement of mixed,unknown or custom radiation sources in different size crystals.It can be used for specific lead activity and Half-value Layer measurement,protection performance measurement and evaluation of different materials,development and test calibration of radiometric instruments,comparison of energy spectra of unknown radiation sources,etc.