Radium

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Radium

Summary

Radium is a naturally occurring alkaline earth metal, and since radium is generally soluble, it can also be found in groundwater. Since radium is a known carcinogen, the U.S. EPA has established the Radionuclides Rule, which regulates the combined levels of radium 226/228 to a Maximum Contaminant Level (MCL) of 5 picoCuries per liter and Gross Alpha to 15 picoCuries per liter. While 25 isotopes have been identified, radium is typically found in groundwater as varying combinations of three isotopes: Ra224, Ra226 and Ra228. Although Ra224 decays rapidly, having a half-life of only 3.66 days, if a sample is analyzed immediately after collection, it contributes to the Gross Alpha. Of greater concern is Ra226 with a half-life of 1,599 years, and Ra228 with a half-life of 5.76 years. Pasted from <https://www.waterworld.com/home/article/16197264/radium-removal-technologies-for-potable-groundwater-systems>

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