Al-Azmi D, Snopek B, Sayed A M, Domanski T
Department of Applied Sciences, College of Technological Studies, Public Authority for Applied Education and Training, Shuwakih, Kuwait.
J Environ Radioact. 2004;71(2):175-86. doi: 10.1016/S0265-931X(03)00167-X.
Based on the different levels of solubility of radon gas in organic solvents and water, a bubbling system has been developed to transfer radon gas, dissolving naturally in water samples, to an organic solvent, i.e. olive oil, which is known to be a good solvent of radon gas. The system features the application of a fixed volume of bubbling air by introducing a fixed volume of water into a flask mounted above the system, to displace an identical volume of air from an air cylinder. Thus a gravitational flow of water is provided without the need for pumping. Then, the flushing air (radon-enriched air) is directed through a vial containing olive oil, to achieve deposition of the radon gas by another bubbling process. Following this, the vial (containing olive oil) is measured by direct use of gamma ray spectrometry, without the need of any chemical or physical processing of the samples. Using a standard solution of 226Ra/222Rn, a lowest measurable concentration (LMC) of radon in water samples of 9.4 Bq L(-1) has been achieved (below the maximum contaminant level of 11 Bq L(-1)).
基于氡气在有机溶剂和水中的不同溶解度，开发了一种鼓泡系统，用于将天然溶解于水样中的氡气转移到有机溶剂（即橄榄油，已知是氡气的良好溶剂）中。该系统的特点是通过将固定体积的水引入安装在系统上方的烧瓶中，以排出气缸中相同体积的空气，从而应用固定体积的鼓泡空气。这样就提供了一种无需泵送的重力水流。然后，冲洗空气（富含氡气的空气）被引导通过一个装有橄榄油的小瓶，通过另一个鼓泡过程实现氡气的沉积。在此之后，直接使用伽马射线光谱法对小瓶（装有橄榄油）进行测量，无需对样品进行任何化学或物理处理。使用(^{226}Ra/^{222}Rn)标准溶液，已实现水样中氡的最低可测量浓度（LMC）为(9.4 Bq L^{-1})（低于最大污染物水平(11 Bq L^{-1})）。
