一套用于现场视察的车载NaI(Tl)_γ谱仪系统的研制  

Development of a Carborne NaI(Tl)_γ Spectrometry System for OSI

作　　者：冯天成[1] 雷卫国[1] 刘俊[1] 殷经鹏[1] 陈伟[1] 苏川英[1] 龙斌[1] 王引东[1] 

机构地区：[1]西北核技术研究所,西安841700

出　　处：《核电子学与探测技术》2013年第3期296-300,320,共6页Nuclear Electronics & Detection Technology

摘　　要：研制了移动式车载NaI(Tl)γ谱仪扫描测量系统,主要用于快速甄别地面及空气中的人工放射性异常。系统主要由大体积NaI(Tl)探测器阵列、数字多道、GPS、电子学柜及越野车组成。系统研制中,以MC计算和实验数据为依据,选择订制了满足需要的探测器;以40K 1 461 keV能峰为稳定参考峰,实时校准峰位,解决了系统谱漂移问题;用抽样率转换方法实现了两个探测器能谱的合成;采用基于噪声调整的奇异值分解法(NASVD)实现能谱降噪、本底剥离与放射性异常甄别;采用实时读取与删除多道数据、在计算机缓存中处理数据后再备份的方法,实现了对不允许测量核素的能窗屏蔽功能;基于C#编写测控软件,实现了谱获取、储存与处理、扫描轨迹记录与显示等功能。系统适用于禁核试核查现场视察与大区域放射性污染场址污染治理,还可应用于一般环境放射性调查及核应急等工作。A carbome NaI（Tl）γspectrum scanning system has been developed, mainly used for anomaly discrimination of artificial radioactivity on the surface or in the air. The system is made up of NaI （Tl） detector array, MCA, GPS, electric module and the car. The appropriate detector is selected based on the data from Monte Carlo simulation and experiment; The spectrum stabilization technique uses ^40K as a reference peak, and the spectrum is stabilized in real time; The spectra from different detectors are synthesized by the method of sampling rate conversion; The NASVD method is used for denoising, background deduction and anomaly discrimination; The information not allowed to acquire in OSI is blinded by the software; The software is programmed to implement the function of data acquiring, processing and showing. The system can be used in On Site Inspection（OSI） and nuclear pollution treatment of large area, and also environment radioactive survey and nuclear emergency response.

关 键 词：现场视察 车载NaI(Tl)γ谱仪 稳谱 能谱合成 异常甄别 能窗屏蔽 

分 类 号：TL81[核科学技术—核技术及应用]