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。

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.

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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