地震氡观测仪计量检定系统与实验分析

Metrological Verification System of Seismic Radon Observation Instrument and Its Experimental Analysis

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/m^3、1500Bq/m^3、3000Bq/m^3、6000Bq/m^3和15000Bq/m^3时,连续8h稳定性均优于5%;为6000Bq/m^3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/m^3,3000Bq/m^3,6000Bq/m^3 and 15000Bq/m^3,and also better than 5%in the 72-hour verification stage of 6000Bq/m^3,which meets the requirement of radon chamber measurement standard in National Metrology Technical specification.