What is a common source of natural background radiation?

A common source of natural background radiation is radon gas from the ground. Radon is a colorless, odorless gas that is produced by the natural radioactive decay of uranium found in soil, rock, and water. As uranium decays, it emits radon gas, which can accumulate in homes, particularly in basements and poorly ventilated areas.

The significance of radon gas as a source of radiation exposure lies in its ability to seep into buildings and contribute to indoor air pollution, leading to potential health risks such as lung cancer with prolonged exposure. The fact that radon gas originates from naturally occurring materials makes it a prominent component of background radiation experienced by people in various geographical locations.

While cosmic rays from the sun, radium found in soil, and uranium in water sources also contribute to natural background radiation, radon is particularly noteworthy because of its prevalence and the health implications associated with chronic exposure, making it a major focus in radiation safety and monitoring efforts.