传送带小物品污染监测仪设计及性能测试  

A converyor belt-based small article pollution monitoring instrument and performance test

作　　者：乔敏娟 任熠 王建飞[1] 王迪 张菁 荆玥泓 刘芸 QIAO Minjuan;REN Yi;WANG Jianfei;WANG Di;ZHANG Jing;JING Yuehong;LIU Yun(Shanxi Zhongfu Nuclear Instruments Co.Ltd.,Taiyuan 030006,China;China Institute for Radiation Protection,Taiyuan 030006,China)

机构地区：[1]山西中辐核仪器有限责任公司,太原030006 [2]中国辐射防护研究院,太原030006

出　　处：《核技术》2022年第10期49-53,共5页Nuclear Techniques

摘　　要：结合核电现场使用需求及对国外设备使用的反馈意见,设计一款基于传送带式的小物品放射性污染γ监测仪。采用半自动化的两路控制设计方案,一路通过电机驱动器控制传送带电机运行模式;另一路通过主控板对探测器数字电路以及相应电气件进行控制;污染监测与物品传送的联动则通过主控板与电机驱动控制器的关联来实现。使用原型样机对本底环境中仪器本底计数率、放射源位于测量腔体中心静止状态下的计数率以及放射源随传送带移动时腔的动态计数率进行测试及分析,结果表明:静止状态下,探测器最小净计数值为平均计数的81.6%;运动状态下,探测器最小峰值净计数值为峰值平均计数的89.3%,最低可探测限可以达到111 Bq,测试性能优于参考标准,满足设计要求。[Background]At present,most of the contamination detection equipments for small items in domestic nuclear power plants are manually putting in and taking out the testing items,and the operation time is long and the steps are relatively tedious.According to the on-site demand of nuclear power and feedback on the use of similar imported equipment,contamination detection equipment based on the conveyor belt can effectively solve these drawbacks.[Purpose]This study aims to design a small itemγpollution measuring instrument that can be used to transmit items with a conveyor belt,hence effectively improve the detection efficiency and save the cost of manual operation.[Methods]Semi-automatic two-channel control design scheme was adopted,one through the motor driver to control the conveyor belt motor running mode,the other control the digital circuit of the radiation detector and the corresponding electrical parts through the main control board.Linkage of contamination monitoring status and item convey was achieved by the status control board associated with the motor drive.The background counting rate of the equipment in the background environment,the counting rate of the radioactive source at rest in the center of the measuring chamber and the dynamic counting rate of the radioactive source moving through the measuring chamber with the conveyor belt were tested and analyzed.[Results]The results show that the minimum net count value of the detector is 81.6%of the average count in the static state.The net value of the minimum peak value of the detector at motion state is 89.3%of the average peak count,and the minimum detectable limit is 111 Bq.[Conclusions]The test performance of prototype is better than the reference standard and meets the design requirements.

关 键 词：传送带 γ监测 探测器 探测限 

分 类 号：TL8[核科学技术—核技术及应用]