Characterization of Commercially Available Active-Type Radon-Thoron Monitors at Different Sampling Flow Rates
Characterization of Commercially Available Active-Type Radon-Thoron Monitors at Different Sampling Flow Rates
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DOI：
10.3390/atmos12080971
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发表时间：
2021-08-01
期刊：
影响因子：
2.9
通讯作者：
Tokonami, Shinji
中科院分区：
文献类型：
--
作者：
Tamakuma, Yuki;Kranrod, Chutima;Tokonami, Shinji
最近，一些商业上可用的有源型氡-钍射气监测器被开发出来;然而，它们的性能还没有被表征。本文介绍了三种市售活性型氡-钍射气监测仪（RAD 7、Radon Mapper和AlphaGUARD）在不同采样流量下的特性。将监测仪测得的钍射气浓度与用抓样法测得的参考值进行了比较。因此，尽管AlphaGUARD的测量浓度与参考浓度的比值降低，但对于RAD 7和Radon Mapper，测量浓度与参考浓度的比值随流速增加。该差异可归因于计算中使用的系数和测量时间方案。结果表明，在钍射气测量中，取样流量的重要性。为了保证被测量的质量和进行被测量的质量控制，应在测量时监测流量，并在多个采样流量下进行定期校准。
Recently, some commercially available active-type radon-thoron monitors were developed; however, their performance has not been characterized. This article presents the characteristics of three commercially available active-type radon-thoron monitors (RAD7, Radon Mapper, and AlphaGUARD) at different sampling flow rates. The thoron concentration measured by the monitors was compared with the reference value measured by a grab sampling method. As a result, the ratio of the measured concentration to the reference increased with flow rate for the RAD7 and the Radon Mapper although that of the AlphaGUARD decreased. The difference may be attributed to the coefficients used in the calculation and the measurement time scheme. The results indicate the importance of the sampling flow rate in thoron measurement. Monitoring of flow rate at the measurement and periodic calibration at multiple sampling flow rates should be conducted for quality assurance and quality control of the measurand.