What term describes the series of transformations that a radionuclide undergoes, including the radiation it emits?

The term "decay chain" refers to the series of transformations that a radionuclide undergoes as it decays into various daughter nuclides, including the types of radiation emitted during these transformations. In a decay chain, a parent radionuclide can decay into one or more daughter radionuclides, which may themselves be radioactive and continue the process of decay. This sequence can involve multiple decay steps and various forms of radiation, such as alpha particles, beta particles, or gamma rays, and highlights how one radionuclide can lead to the formation of others.

Understanding decay chains is crucial for professionals measuring and interpreting radon levels because radon itself is part of a decay chain. Specifically, radon-222 is a decay product of uranium-238, and monitoring radon exposure requires knowledge of the entire decay process and the subsequent products that may also pose health risks.