Alpha and beta decay are almost always accompanied by gamma decay.
gamma decay is the release of energy in the form of gamma rays.
In a gamma decay, a high energy photon is emitted from the nucleus to attain a lower energy configuration.
In the gamma decay of a nucleus, the emitted photon and recoiling nucleus each have a well-defined energy after the decay.
For example, there is not beryllium yield from fission or from any alpha, beta or gamma decay.
gamma decay in Science
gamma decay A radioactive process in which an atomic nucleus loses energy by emitting a gamma ray (a stream of high-energy photons). When an element undergoes gamma decay its atomic number and mass number do not change.