Monte Carlo Simulation For γ Spectrum And Simulation Software Design

The issue of Monte Carlo simulation forγspectrum is an important area of research in the applications of nuclear technology.Used Monte Carlo simulation forγ-ray response functions(spectrum)of NaI(Tl)detector is an effective way to solve the problem ofγ-ray energy spectrum.This thesis is base on the State 863 plans,the issue of resources and environmental technology major projects "aeronautic gamma energy spectrum exploration systems research and development"(No:2006AA06A207),the project of "The study of natural gamma in field of nuclear geophysics" financed by National Natural Science Foundation of China(No:40774063)and the project of "Monte Carlo simulation forγspectrum and software development" financed by Chengdu University of Technology science and technology project(No:2007043K).This article explores the numerical simulation on response function ofγ-ray NaI(Tl) detector by Monte Carlo method and development the Monte Carlo simulation software.The study has important practical value and guiding role for nuclear technology resources prospecting and environmental radiation monitoring in the field of the environmental resources.Main research results and performance in the following:(1)This thesis introduces the basic principles of the Monte Carlo method and the mechanism of theγ-ray and physical atom.(2)This thesis introduces theγenergy spectrum of NaI(Tl)detector and the Monte Carlo calculation basis on the formation process ofγ-ray response function in NaI(Tl)detector.(3)In Visual C++platform developmentγspectrum Monte Carlo simulation software.Use Monte Carlo simulation software to simulate theγphoton energy deposition spectrum andγspectrum in NaI(Tl)detector. (4)To test the accuracy and the universal of the simulation method,can use the software to simulate the lower and higher energyγ-ray which energy within the framework of naturalγ-ray response function in NaI(Tl)detectors can compared toγenergy spectrum of point-source which measured by digital multi-channel spectrometer system(NaI(Tl)Crystalφ75 mm×75mm)and analog spectrum.The results of the simulation for the lower energy sources such as theγray released by ¹³⁷Cs are accuracy.To compare the simulation spectrum with the experimental spectrum,the relative error of the Peak-to-Compton ratio is 1.879 percent and the relative error of the energy resolution is 5.585 percent,for the higher energy sources such as theγ-ray released by(60)^Co,the relative error of bimodal area is 0.7505 percent, can also be satisfied with the simulation results.The software which has user friendly and highly functional can sample more than 20 million.It can adjust the energy of the sources(that is,choose different sources),the distance between source and detector, detector size.It also can display and save simulation results.