Radon-222 is the longest-lived isotope of radon with a half-life of 3.28 days, emitting alpha particles, and is a decay product of radium.
Isotop Radon nan paliang stabil adolah Radon-222 jo wakatu paruah salamo 3.8235 hari, nan salapeh itu mangalami paluruahan alpha manjadi Polonium-218.