摘要
设计了一种便携式食品放射性检测仪,主要包括测量结构、核信号处理单元和能谱分析程序。核信号处理单元主要包括抗混叠低通滤波器、程控增益放大器、高速A/D采样、数字低通滤波、梯形成形、脉冲幅度甄别和能谱获取等。能谱分析程序主要包括能谱光滑、能谱寻峰、能量刻度、本底扣除以及活度计算等。最后,以测量^(131)I核素为例,研究了仪器对不同体积样品的探测效率、刻度系数和最低可探测活度,并根据刻度系数对300 mL食品样品的放射性测量结果进行校正。结果表明,仪器对常见食品中^(131)I的放射性活度检测结果误差小于10%,满足食品放射性测量需求。
A portable food radiation monitor has been developed and tested.This paper introduced the measurement structure,nuclear signal processing unit and the analysis application program.The nuclear signal processing unit includes anti-aliasing low-pass filter,programmable gain amplifier,high-speed A/D sampling,digital low-pass filter,trapezoidal shaping,pulse amplitude discrimination,and energy spectrum acquisition unit.The analysis application program includes functions for spectral line smooth,spectral peak-seeking,energy calibration,background deduction and activity calculation.The detection efficiency,the correction coefficient and the MDA of ^(131)I have been determined.The calibration coefficient has been used to correct the radioactivity measurement results of 300 mL-food sample.The results show that the measurement error of monitor for ^(131)I radioactivity in the general food is less than 10%,which satisfies the demand of food radioactive measurement.
作者
周英杰
张海薇
杨月
侯琼
李君
卢位
王磊
ZHOU Yingjie;ZHANG Haiwei;YANG Yue;HOU Qiong;LI Jun;LU Wei;WANG Lei(College of Nuclear Technology and Automation Engineering,Chengdu University of technology,Chengdu 610059,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu 610059,China)
出处
《原子核物理评论》
CAS
CSCD
北大核心
2022年第2期215-223,共9页
Nuclear Physics Review
基金
科技部重大科学仪器设备开发专项(2012YQ18011805)
成都市科技惠民计划项目(2014-HM01-00099-SF)
四川省科技计划项目(2021JDRC0107)
四川省科技计划项目(2021JDRC0068)。
