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地震氡观测仪计量检定系统与实验分析
黄仁桂1,2, 陈俊松3, 周红艳1,2, 宁洪涛1,2, 毛华1,2
1.江西省地震局, 南昌 330039;2.地震监测氡观测仪器检测实验室, 南昌 330039;3.中广核贝谷科技有限公司, 南昌 330039
摘要:
本文介绍了地震氡观测仪计量检定系统(氡室)的建设背景及结构组成。氡室具有氡体积活度(氡浓度)实时监测、动态补氡、氡期望值可调、稳定性好等特点。在氡室调试实验中进行了氡室的漏气率实验及4次补氡实验,计算出氡室的氡漏气率为0.0001393Bq/min,氡发生率为23.35Bq/min。根据《测氡仪检定规程》(JJG 825—2013)的技术要求进行计量效能验证,表明氡室的氡体积活度(氡浓度)为800Bq/m3、1500Bq/m3、3000Bq/m3、6000Bq/m3和15000Bq/m3时,连续8h稳定性均优于5%;为6000Bq/m3时,72h稳定性优于5%,符合国家计量技术规范对氡室计量标准的要求。
关键词:  氡观测仪  地震  氡室  计量检定  实验
DOI:
分类号:P315
基金项目:中国地震局地震科技星火计划项目(XH18025Y、XH2003Y)和中国地震局监测、预测、科研三结合课题(3JH-201902013、3JH-201902012)共同资助
Metrological Verification System of Seismic Radon Observation Instrument and Its Experimental Analysis
Huang Rengui1,2, Chen Junsong3, Zhou Hongyan1,2, Ning Hongtao1,2, Mao Hua1,2
1.Jiangxi Earthquake Agency, Nanchang 330039, China;2.Seismic Radon Observation Instrument Testing Platform, Nanchang 330039, China;3.CGN Begood Technology Co., Ltd., Nanchang 330039, China
Abstract:
This paper introduces the construction background and structure of the metrological verification system of seismic radon observation instrument,namely,the radon chamber which possesses the advantages of real-time monitoring of radon concentration,dynamic radon supplement,adjustable expected value of radon supplement and stability. Through the radon leakage rate experiment and four-round radon supplement experiment,this paper concludes that the radon leakage rate of the radon chamber is up to 0.0001393Bq/min and the radon incidence rate reaches 23.35Bq/min. According to the technical requirements of JJG 825-2013 Verification Regulations for Radon Measuring Instruments,the stability of radon chamber is better than 5% in the 8-hour verification stage of 800Bq/m3,1500Bq/m3,3000Bq/m3,6000Bq/m3 and 15000Bq/m3,and also better than 5% in the 72-hour verification stage of 6000Bq/m3,which meets the requirement of radon chamber measurement standard in National Metrology Technical specification.
Key words:  Radon observation instrument  Earthquake  Radon chamber  Metrological verification  Experiment