驻极体法在建筑材料氡析出率测量中的应用研究

目的:研究使用驻极体氡探测器测量建材氡222(222Rn)析出的方法.方法:设计、制作建筑材料222Rn析出测量专用密封箱,将驻极体氡探测器与建材样品放入箱中并密封,分不同时间段做累积测量,并于密封箱外部串联一台氡连续测量仪,与驻极体同时测量密封箱内222Rn浓度.通过测量计算密封箱内累积氡浓度,分析比较驻极体法与连续...

An applied research of electret method in the measurement of Radon exhalation rate of buiding materials

Objective:To study the method of measuring Radon exhalation from building materials by electret Radon detector.Methods:A special sealed box for the measurement of Radon exhalation of building materials was designed and manufactured.The electret Radon detector and the samples of building materials were put into the box and were sealed.The accumulated measurement was conducted in different time quantum.And a Radon continuous detector was connected with the exterior of sealed box by series connection,and it was used to measure the Radon concentration inside of sealed box at the same time.The difference and influence factor of measured result of Radon exhalation rate between electret method and continuous measurement method were analyzed and compared through measured and calculated the accumulated Radon concentration inside of the sealed box.Results:The relative percentage deviation between the results of electret measurement of each accumulated time quantum and the results of continuous measurement was from 9.24%to 28.8%.The percentage deviation between the measured results of electret method within 24 hours and that of continuous method was the smallest,and the relative percentage deviation was 9.24%.Conclusion:Electret method can be used to measure Radon exhalation of building materials,and it has the advantages of convenient arrangement and simple measurement in field measurement with short period.