摘要
放射性核素的探测与识别在防止核材料扩散、反对核恐怖主义、海关检测以及核事故应急中有着重要应用,是核安全领域中关键的一环。常用的闪烁体探测器(如NaI(Tl)和LaBr_(3)(Ce)探测器)在外部工作环境(如温度、磁场等)变化时会出现能谱漂移现象,导致核素识别结果出错。为了校正探测器在不同温度下测量时发生的谱漂移,研究了一种单峰稳谱算法,该算法利用天然本底中^(40)K1460keV特征峰作为参考峰,对比实测本底谱与数据库中已知不同温度本底谱中^(40)K特征峰位,对实测能谱进行校正。该方法不需要依靠探测器中晶体自身本底特征峰(如LaBr_(3)(Ce)的^(138)La36keV)或者借助外部放射源,因此操作更加方便简单,适用性也更好。本文通过在不同温度下开展测试实验,证明了该方法能够有效地进行稳谱,同时验证了核素识别的准确性。
The detection and identification of radionuclides has important applications in preventing the proliferation of nuclear materials,anti-nuclear terrorism,customs detection,and nuclear accident emergency,and is the key in the field of nuclear security.Scintillator detectors used for nuclide identification(such as NaI(Tl)and LaBr_(3)(Ce)detectors)will appear peak shift problem when the external working environment changes(such as temperature,magnetic field,etc.),making nuclide identification results appear wrong.To correct the peak shift of the detector at different temperatures,a single peak spectral stabilization algorithm was studied in this paper.The method used the peak of ^(40)K 1460 keV in natural background as the reference peak,compared the measured background spectrum with the known background spectrum of different temperature^(40)K peak in the database,and corrected the measured energy spectrum.This method does not need to rely on the crystal's own background characteristic peaks(such as ^(138)La 36 keV of LaBr_(3)(Ce))or external radioactive sources,so it is easy to operate and has good applicability.In this paper,the test experiments at different temperatures prove that the method can effectively stabilize the spectrum and verify the accuracy of nuclide identification.
作者
程梓芸
周玉龙
李林祥
王忠海
CHENG Ziyun;ZHOU Yulong;LI Linxiang;WANG Zhonghai(Northwest Institute of Nuclear Technology,Xi'an 710024,China;College of Physics,Sichuan University,Chengdu 610065,China)
出处
《核电子学与探测技术》
CAS
北大核心
2024年第3期447-453,共7页
Nuclear Electronics & Detection Technology
关键词
核素识别
稳谱
能谱漂移
nuclide identification
spectra stabilization
peak-shift
