What is the primary source of radon in buildings?

The primary source of radon in buildings is radon emanating from soil and rock. Radon is a naturally occurring radioactive gas that is produced by the decay of uranium found in soil, rock, and water. As radon gas is generated, it can move through the ground and enter buildings, particularly those with basements or contact with the ground.

This entry typically occurs when there are cracks in floors, walls, or around pipes, which allows the gas to accumulate indoors. Understanding that soil and rock are the main sources helps in effectively assessing radon risks in residential and commercial buildings. Identifying and mitigating the pathways through which radon can enter a structure is essential in radon risk management.