摘要
NaI-LaBr_3双探测器应用于海水在线辐射监测可更好地实现人工放射性核素监测预警及活度分析。为研究双晶体在线监测γ能谱的MC模拟方法,在实验室初步搭建双晶体探测系统进行了点源能谱实验,根据实验设计通过MCNP5对双晶体探测系统建模,计算了γ射线在双晶体内的归一化能谱,并利用MATLAB编写程序实现了双晶体MC模拟高斯展宽,模拟谱与实验谱对比误差较小。结果表明,双晶体MC模拟和展宽方法是可行的,可应用于下一步计算海水体源比活度响应曲线。
The application of NaI-LaBr3 double detectors for in situ measurement of seawater radiation can better realize the monitoring and early earning and activity analysis of artificial radionuclides.To study MC simulation method of the dual crystal detection system in situ γ-ray spectra,a dual-crystal detection system has been preliminarily built in the laboratory to perform point source energy spectrum acquisition experiments,the model of double crystal detection system by MCNP5 is built based on experiment condition,the normalized energy spectrum of γ-ray in double crystals is calculated,and double crystal Monte Carlo simulation and gaussian broadening is achieved by MATLAB,the error between the simulated spectrum and the experimental spectrum is small.The results show that MC simulation and gaussian broadening method is feasible and can be applied to calculate the response curve of seawater radioactive source activity concentration.
作者
于奇
房宗良
文其林
张海红
YU Qi;FANG Zong-liang;WEN Qi-lin;ZHANG Hai-hong(Institute of NBC Defence,Beijing 102205,China;Unit 66114,Beijing 102407,China)
出处
《核电子学与探测技术》
CAS
北大核心
2018年第5期639-644,共6页
Nuclear Electronics & Detection Technology
