Schmidt Axel, Schlueter Michael, Melles Martin, Schubert Michael
Department of Analytical Chemistry, Helmholtz-Centre for Environmental Research-UFZ, Leipzig, Germany.
Appl Radiat Isot. 2008 Dec;66(12):1939-44. doi: 10.1016/j.apradiso.2008.05.005. Epub 2008 May 22.
A robust and straightforward method for on-site determination of radon-222 activity concentrations in water is presented. The methodical approach is based on the principle of liquid-gas-membrane extraction. An extraction module, which consists of hollow polypropylene fibres, allows radon stripping from the water of interest into a connected closed air-loop. The resulting radon-in-air activity concentration, which can easily be reconverted into the original radon-in-water activity concentration is measured by means of a standard mobile radon-in-air monitor. The experimental set-up allows radon detection in discrete water samples as well as continuous water pump streams. The technique, covering a wide activity concentration range, is in particular advantageous for measurements of radon-in-water in the field or on research cruises.
本文介绍了一种用于现场测定水中氡-222活度浓度的强大且直接的方法。该方法基于液-气-膜萃取原理。一个由中空聚丙烯纤维组成的萃取模块可使目标水中的氡气被剥离到相连的封闭空气回路中。通过标准的便携式空气中氡监测仪测量由此产生的空气中氡活度浓度，该浓度可轻松转换回原始的水中氡活度浓度。该实验装置可对离散水样以及连续水泵流中的氡进行检测。这项技术涵盖了较宽的活度浓度范围，特别有利于在野外或研究航行中对水中氡进行测量。
