快速水氡测量方法的研究

The research on a rapid measuring method for radon in water

目的:解决传统水氡现场测量系统复杂以及水氡的提取、转移、平衡和测量需要较长时间且费时又费力等问题,实现水氡的现场快速测量。方法:研究设计一套现场鼓气装置,配合静电收集法、电离室法等连续测氡仪,以实现水氡的现场快速测量;结合水氡测量装置的结构和工作原理,验证具体的测量程序、测量比对和现场快速测量方法。结果:该快速测量方法与美国RAD7H20测量比对,相对百分偏差为1%~6%,测量结果基本一致。采用该水氡测量装置对我国6省会城市的自来水中氡含量进行了测定,自来水中氡含量均值为6.74 Bq L^(-1),范围为0.96~24.98 Bq L^(-1)。结论:本研究设计的水氡快速测量装置体积小,操作简单,测量准确性高,适合较大规模的饮用水氡调查工作。

Objective：The traditional radon in water measurement system is complex, and the extraction, transfer, balance and measurement of radon in water takes a long time traditionally. A measuring device for radon in water was developed to achieve rapid measurement of radon in water.Methods： The construction, principle, measurement procedures and intercomparison with other measuring instrument were introduced, and the measurements were carried out in field. Results： The intercomparison results between the method in this study and RAD7H20 were in a good agreement, and relative percent difference ranged from 1% to 6%. The tap water samples collected from 6 capital cities were tested by the measuring device in this study and the average radon concentration in water was 6.74 Bq L-1, in range of 0.96-24.98 Bq L-1.Conclusion：The measuring device in this study with a small volume is easy to perform and can obtain high accuracy. It is suitable to larger scale investigation for radon in drinking water.