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.
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