Radon is detected in a home through the measurement of __________.

Radon is a radioactive gas that is produced naturally from the decay of uranium in soil, rock, and water. When radon decays, it emits alpha particles, which are a type of ionizing radiation. The detection of radon in homes primarily involves measuring these alpha particles.

The process of measuring radon usually utilizes detectors that can capture the alpha particles emitted by radon gas as it decays in the environment. This is crucial because alpha particles are unique to certain radioactive materials, including radon, making them a reliable indicator for the presence of this gas.

While beta particles and gamma rays are types of radiation that can also be emitted by other radioactive materials, they are not specifically associated with radon detection. X-rays, on the other hand, are a different form of electromagnetic radiation unrelated to the decay products of radon. Therefore, the correct answer focuses on the direct measurement of alpha particles to ensure accurate radon detection in residential settings.