Decay Chain Examples Cesium (Cs) Americium (Am) Haf-ife: 241 95 Am \ 239 Half-life: Np Key Alpha particle: a / \ Beta particle: p < 222 Rn ) Gamma ray: Y V1_V In the example, Rn is the atomic symbol for the element Radon. The number 222 indicates the atomic mass of the element (or isotope). The number 86 represents the element's atomic number. ^VpPA Environmental Protection RaclTown Radioactive Atom Activity Set EPA 402-B-19-021 * * Agency https://www.EPA.gov/RadTown/Activitv-6-Radioactive-Decav-Chain ------- |