After emitting an alpha or beta particle, the nucleus will often still be ‘excited’ and will need to lose energy. It does this by emitting a high energy electromagnetic wave called a gamma ray.

Gamma radiation has no mass and no charge. It can be written as γ or \(_{0}^{0}\textrm{γ}\) An example of beta and gamma decay of cobalt-60 Beta and gamma decay of cobalt-60: ...