【摘要】 本文介绍一种简便的被动式活性炭吸附累积采样、液闪测量空气中平均氡浓度的方法。该方法采样、制样和测量均简便,灵敏度高,成本低廉,性能稳定,特别适于大范围调查和自动测量。在室温下暴露48 h,刻度系数为699 cpm/Bq·1^-1(25.9 cpm/pC₁·1^-1),在样品和本底均测10 min,95%置信水平下的最小可探测限为8.3 mBq/1（0.2 pC₁/1）。本文还仔细讨论了该探测系统的各种参数及刻度系数与温度的依赖关系,给出了不同暴露时间刻度系数的拟合公式。由于采样装置设计有干燥剂柱,故不需要做湿度校正。更多还原

【Abstract】 The paper presents a measurement method of average Rn-222 concentrations in air based on passive accumulative activated charcoal absorption-liquid scientilation analysis,which is low-cost,easysampling,simple measurement,high sensitivity,good stability,and well suitable to large-scale surveysand automatic measurements.After exposure of 48 hours at room temperature（21℃）,the calibrationcoefficient obtained is 699 cpm(Bq·L^-1)^-1(25.9 cpm(pCi·L^-1)^-1).If the counting time for sampleand background is 10 rain respectively,the minimum detection limit at p=0.05 is 8.3×10^-3Bq·L^-1(0.2 pCi·L^-1).The paper also discusses the dependence of several parameter and calibration coeffi-ciente of the measurement system,on temperature,and the calibration coefficients are given for differ-ent exposure time.Humidity correction is not necessary because the system is equiped with dry cleaner.更多还原