新型β射线背散射测厚仪设计  

Design of a New Beta Ray Backscattering Thickness Gauge

作　　者：李文涛[1] 田俊 LI Wen-tao;TIAN Jun(School Of Information Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学信息工程学院

出　　处：《核电子学与探测技术》2019年第4期468-472,共5页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金资助项目(61463041);内蒙古科技大学校企合作项目(2016077)资助

摘　　要：为了能够准确检测核燃料棒锆包壳管内壁涂覆的石墨层厚度,设计了一款基于76011型G-M传感器和STM32微控器的β射线测厚仪。传感器发射的β射线投射到管内壁的石墨涂层后发生背散射,β源所产生的β粒子穿过G-M管中被施加一定的电压的惰性气体(含有少量卤族气体)时,在管中阳极丝上输出一列脉冲信号,经过信号调理电路和单片机计数及处理后,转换为石墨层的厚度并记录下来。分析测量结果表明,测厚仪测量值与标样值的最大偏差为0.47μm,即不确定度为6.2%,系统检测误差优于国标要求,表明该设计方案是可行的。In order to detect the thickness of the graphite layer coated on the inner wall of the nuclear fuel rod zirconium cladding tube accurately,a beta ray thickness gauge based on the Model 76011 G-M sensor and STM32 microcontroller was designed.When the β-ray emitted by the sensor is projected onto the graphite coating on the inner wall of the tube,backscattering occurs,and the β-particle generated by the β-source passes through an inert gas(containing a small amount of halogen gas)to which a certain voltage is applied in the G-M tube,in the tube.A column of pulse signals is outputted on the anode wire,and after being counted and processed by the signal conditioning circuit and the single chip microcomputer,converted into a thickness of the graphite layer and recorded.The analysis and measurement results show that the maximum deviation between the measured value of the thickness gauge and the standard value is 0.47μm,that is,the uncertainty is 6.2%,and the system detection error is better than the requirement of national standard,indicating that the design scheme is feasible.

关 键 词：β背散射法 G-M传感器 石墨涂层 测厚 无损检测 

分 类 号：TL811.3[核科学技术—核技术及应用]