How does radon typically enter a home?

Radon typically enters a home primarily through cracks and other openings in the foundation. This process occurs because radon is a naturally occurring radioactive gas that originates from the decay of uranium in soil and rock. As radon is released from the ground, it can accumulate in homes, especially if these structures are built on or near radioactive soil or rock. Cracks in the foundation, gaps around pipes, and construction joints provide pathways for radon to seep indoors.

The other options do not accurately represent how radon enters homes. For instance, while open windows can allow fresh air to circulate, they do not serve as a significant route for radon infiltration compared to foundation cracks. The idea of radon bonding with water is also misleading, as radon does not typically travel through water systems in a way that contributes notably to its presence in homes. Lastly, radon does not enter via electrical systems; it relies on the physical structure and condition of the house to penetrate the indoor environment. Understanding these entry points is crucial for radon measurement and mitigation strategies.