What is the half-life of Radon?

Radon is a naturally occurring radioactive gas that emits from the decay of uranium and thorium found in soil and rock. The half-life of a radioactive substance is the time it takes for half of the substance to decay into another element or isotope. In the case of Radon-222, which is the most significant isotope of radon found in the environment, its half-life is approximately 3.8 days. This relatively short half-life means that radon gas can accumulate in confined spaces, such as basements, making it important for homeowners and environmental specialists to monitor radon levels, especially in areas where geological conditions facilitate its accumulation. Understanding the half-life is crucial for assessing the risks associated with radon exposure and implementing appropriate mitigation measures.

The other options present longer half-lives that do not correspond to the primary isotope of radon that is of concern in environmental health.