摘要
为解决国内电离室型氚监测仪的量值溯源难题,开展了电离室型氚监测仪校准方法研究.建立氚监测仪的实验室校准装置,以氚气标准源和电离室型氚监测仪为研究对象,研究校准回路中气体压强、湿度、校准回路中氚的滞留效应、周围γ射线等对校准结果的影响以确定适当的校准条件;通过控制充入校准装置内氚气标准源体积配制不同活度浓度的校准氚气,测量氚监测仪对氚活度浓度的响应.电离室型氚监测仪对氚气活度响应线性良好(R^(2)=0.9994),校准因子为1.17,扩展不确定度(k=2)为8.0%.
In order to solve the problem which is quantity traceability of ionization chamber tritium monitor,the calibration method of ionization chamber tritium monitor was studied.The laboratory calibration device of the tritium monitor was established.Tritium gas standard source and ionization chamber tritium monitor are used as research objects,the influencing factors in the calibration process are studied,including the gas pressure and humidity in the calibration circuit,the retention effect of tritium in the calibration circuit and the surrounding environmentγRadiation,etc.Finally,the appropriate calibration conditions are determined.The calibration tritium gas with different activity concentrations is obtained by controlling the volume of tritium gas standard source filled into the calibration device,and the response of tritium monitor to tritium activity concentration is measured.The ionization chamber tritium monitor has a good linear response to tritium gas activity(R^(2)=0.9994),the calibration factor is 1.17,and the expanded uncertainty(k=2)is 8.0%.
作者
李明
徐利军
毛娜请
叶宏生
罗瑞
林敏
LI Ming;XU Li-jun;MAO Na-qing;YE Hong-sheng;LUO Rui;LIN Min(National Key Laboratory of Metrology and Calibration Techniques,China Institute of Atomic Energy,Beijing 102413,China)
出处
《核电子学与探测技术》
CAS
北大核心
2022年第5期793-798,共6页
Nuclear Electronics & Detection Technology
关键词
电离室
氚监测仪
校准装置
校准因子
不确定度
ionization chamber
tritium monitor
calibration device
calibration factor
uncertainty
