Radiation:
How does radium get into the environment?
Radium occurs naturally in the environment. As a decay product of uranium and thorium, it is common in virtually all rock, soil, and water. Usually concentrations are very low. However, geologic processes can form concentrations of naturally radioactive elements, especially uranium and radium. Radium and its salts are soluble in water. As a result, groundwater in areas where concentrations of radium are high in surrounding bedrock typically has relatively high radium content.

For more information on radium follow the link below:
http://www.epa.gov/radiation/radionuclides/radium.html

Contact R&S Water Service for efficient ways to reduce radium and radon in your home.