基于模拟退火算法的γ能谱全谱定量分析  

Analyzing Techniques for γ Spectra Based on Simulated Annealing Algorithm

作　　者：王崇杰[1] 孙博[1] 张占南[1] 高威[1] 周小波[1] 付颖[1] 张爱莲[2] 冯春梁[3] 

机构地区：[1]辽宁师范大学物理与电子技术学院,大连116029 [2]辽宁师范大学分析测试中心,大连116029 [3]辽宁师范大学化学与化工学院,大连116029

出　　处：《核电子学与探测技术》2011年第10期1157-1162,共6页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金项目(60572009);辽宁省科技基金项目(99102004)资助

摘　　要：根据γ能谱仪系统的线性叠加性,提出一种基于全局优化算法—模拟退火算法的γ能谱全谱定量分析方法。通过引入谱漂移校正参数,实现了谱漂移的软件校正。对模拟γ能谱的分析误差小于2%。对标准环境样品中226Ra2、32Th及40K的分析误差均小于10%。对方法的定量分析下限和能量分辨率进行了深入研究。结果表明,该方法具有较低的定量分析下限,并且定量分析下限只与相关核素γ射线的总强度直接有关,分析精度几乎不受重叠峰的影响。According to the linear superposition property of γ spectrometer system,a kind of method for quantitative analysis of γ spectra was brought forward based on Simulated Annealing Algorithm.The parameters for adjusting the spectrum drifts were introduced into the optimizing function,as a result,a high analytical precise was achieved.The deviations are less than 2% for the simulated spectra,and all less than 10% for radioactive isotopes：226Ra、232Th and 40K in the standard sample.The limit of quantitative analysis and energy resolution of the method were studied and discussed in depth.The results show that the method has low limit of qualitative analysis,which only depends on the whole intense of all the rays emitted from the relevant radioactive isotopes,and the analytical precise of the method is mostly not affected by the overlapped peaks.

关 键 词：γ能谱分析 目标函数 模拟退火算法 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]