新入网地震水氡观测仪校准方式研究  

Study on the calibration method of newly connected seismic water radon monitor

作　　者：黄仁桂 赵影 李雨泽 宁洪涛 周红艳 毛华 肖健 肖孟仁 黄培[3] HUANG Rengui;ZHAO Ying;LI Yuze;NING Hongtao;ZHOU Hongyan;MAO Hua;XIAO Jian;XIAO Mengren;HUANG Pei(Observatory for Geodynamic of the East Yangtze Block in Jiujiang,Jiujiang 332006,China;Jiangxi Earthquake Agency,Nanchang 330039,China;East China Institute of Technology,Nanchang 330013,China)

机构地区：[1]江西九江扬子块体东部地球动力学野外科学观测研究站,九江332006 [2]江西省地震局,南昌330039 [3]东华理工大学,南昌330013

出　　处：《核技术》2023年第11期40-48,共9页Nuclear Techniques

基　　金：国家自然科学基金(No.42274235);地震科技星火计划(No.XH21017Y);地震国家计量技术规范制修订计划(No.G2022004)资助。

摘　　要：针对新入网模拟氡观测仪(人工)校准方式选择,按照JJG825—2013测氡仪国家计量检定规程,采用循环法、真空法和流气法三种校准方式进行实验和不确定度评定分析,获得适合新入网地震水氡观测仪校准的校准方法。结果表明:循环法校准闪烁室探测效率最高,影响因素较少,且适合人工和数字测氡仪的校准;真空法校准存在管路气体稀释标准氡气和气压平衡影响,造成真空法采样效率偏低,活度响应(R)偏大;流气法校准由于不断向闪烁室内充入新的氡气,影响闪烁室内氡气的动态稳定,且校准期间充氡气未排本底,造成活度响应(R)偏大且误差偏大。因此,从各项指标上比较,循环法比较适合新入网地震水氡观测仪校准,可为其他新入网水氡仪和气氡仪的校准提供参考。[Background]The calibration of radon measuring instruments is the most important and key technical link to ensure the reliability and accuracy of radon observation data and plays a vital role in seismic monitoring and prediction.[Purpose]This study aims to obtain a calibration method suitable for the calibration of newly connected seismic water radon monitor according to the National Metrological Verification Regulations for Radon Meters(JJG825-2013),the calibration experiment is carried out for the analog radon observatory(manual),which is newly adopted by the seismic network,and the calibration method suitable for the seismic water radon observation is obtained.[Methods]Firstly,the FD-125 radon-thorium analyzer was used as the experimental instrument,the calibration experiments were carried out in the standard radon chamber by three calibration methods:circulation method,vacuum method,and flow-gas method.Then,the volume response coefficients of three methods were calculated,and the uncertainty sources and mathematical models were analyzed according to JJG825—2013 regulation.Measured values by internationally recognized standard AlphaGUARDPQ2000Pro radon meter were taken as theoretical references of radon concentration for radon chambers,hence the uncertainties of three calibration methods were obtained.[Results]The results show that the circulation calibration method has the highest detection efficiency and fewer influencing factors,and is suitable for manual and digital radon detector calibration.The vacuum calibration method is affected by the standard radon gas diluted by pipeline gas and pressure balance,resulting in low negative pressure sampling efficiency and high volume activity response coefficient R.As for the flow-gas calibration method,the continuous injecting of radon gas into the scintillation chamber affects the dynamic stability of radon gas in the scintillation chamber,and radon gas is not discharged to the background during calibration,resulting in the high volume activity response coefficie

关 键 词：测氡仪 水氡观测 标准氡室 体积活度响应系数 

分 类 号：TL99[核科学技术—核技术及应用]