Galán López M, Martín Sánchez A
Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avenida Complutense, 22, 28040 Madrid, Spain.
J Environ Radioact. 2008 Oct;99(10):1539-43. doi: 10.1016/j.jenvrad.2007.12.013. Epub 2008 Jan 30.
Radon-222 was measured in groundwater sources of Extremadura (Spain), analyzing 350 samples from private and public springs, wells, and spas by liquid scintillation counting (LSC) and gamma spectrometry. The 222Rn activity concentrations ranged from 0.24 to 1168 Bq L(-1). The statistical analysis showed a log-normal distribution with a mean of (111+/-7) Bq L(-1) and a median of (36+/-3) Bq L(-1). A hydrogeological study revealed correlations between the activity concentration and the aquifer material's characteristics. A map of 222Rn in groundwater was elaborated and compared with the natural gamma radiation map for this region. About 35% of the samples showed 222Rn activity concentrations above the Euratom recommended limit of 100 Bq L(-1). Three uranium series radionuclides (238U, 234U, and 226Ra) were also assayed by alpha-particle spectrometry, estimating the annual effective dose due to the presence of these natural radionuclides in drinking water.
对西班牙埃斯特雷马杜拉地区的地下水源中的氡-222进行了测量，通过液体闪烁计数法（LSC）和伽马能谱法对来自私人和公共泉水、水井及温泉浴场的350个样本进行了分析。222Rn活度浓度范围为0.24至1168 Bq L(-1)。统计分析显示其呈对数正态分布，均值为(111±7) Bq L(-1)，中位数为(36±3) Bq L(-1)。一项水文地质研究揭示了活度浓度与含水层物质特征之间的相关性。绘制了该地区地下水中222Rn的分布图，并与该地区的天然伽马辐射图进行了比较。约35%的样本显示222Rn活度浓度高于欧洲原子能共同体推荐的100 Bq L(-1)限值。还通过α粒子能谱法对三种铀系放射性核素（238U、234U和226Ra）进行了测定，估算了饮用水中这些天然放射性核素所致的年有效剂量。
