基于系统变换理论的NaIγ能谱漂移校正  

Drift correction of NaI gamma spectra based on system transformation theory

作　　者：王崇杰[1] 吴怡 赵思文 周莹莹 刘靖楠 WANG Chongjie;WU Yi;ZHAO Siwen;ZHOU Yingying;LIU Jingnan(School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China)

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《实验室科学》2021年第4期19-22,共4页Laboratory Science

基　　金：大连市科技合作项目(项目编号:85017017)。

摘　　要：针对传统谱漂移校正方法的不足,提出了基于系统变换理论的γ能谱漂移校正方法。根据系统变换理论,反演出了探测器中相应实测γ能谱的理论沉积能谱,消除了谱仪参数及其不稳定性对γ能谱的影响,使谱线水平漂移和谱强度变化均得到合理有效校正。对标准放射源的NaIγ能谱进行了漂移校正。结果表明,峰位最大相对漂移由校正前的36.48%减小为校正后的0.10%,峰高最大相对偏差由校正前的22.54%减小为校正后的2.96%。该方法弥补了传统方法的不足,并具有较强的校正能力,为提高γ能谱分析精度提供了理论和技术基础。原则上,该方法同样适用于其它能谱和光谱校正。For the deficiency of traditional spectral drift correction methods,a new method for correcting spectral drifts of gamma spectra based on system transformation theory was proposed.The theoretical deposition energy spectrum in detector corresponding to actual measured spectrum was obtained according to the system transformation theory.Therefore,the influence of gamma spectrometer parameters and their instabilities on gamma spectrum was eliminated,thus both horizontal spectral drift and spectral intensity variation were efficiently corrected.The actual measured NaI spectra of a standard radioactive source were corrected.The results showed that the maximum relative peak drift decreased from 36.48%before correction to 0.10%after correction,the maximum relative peak height deviation decreased from 22.54%before correction to 2.96%after correction.The correction method covers the shortages of traditional methods,and has strong ability to correct the spectral drift,which provides theoretical and technological basis for effectively improving the accuracy of the gamma spectrum analysis.In principle,the correction method is also applicable to other kinds of spectra.

关 键 词：γ能谱分析 系统变换 随机变量 概率密度函数 

分 类 号：TP339[自动化与计算机技术—计算机系统结构]