1975年，在佛罗里达州萨拉索塔县的几处饮用水中发现了镭-226。对用于去除Ra-226的八个反渗透处理系统的研究结果表明，所有系统都有效地将原水中的浓度降低到EPA最大污染物水平5 pCi/L以下，尽管这些系统的年龄、类型和性能各不相同。包括12个参考文献、表格和图表。

In 1975 radium-226 was discovered in several drinking water supplies in Sarasota County, Florida. The results of a study of eight reverse osmosis treatment systems used for the removal of Ra-226 show that all systems effectively lowered concentrations in the raw water below the EPA maximum contaminant level of 5 pCi/L, although the age, type, and performance of the systems varied. Includes 12 references, tables, figures.