After alpha or beta decay processes it is common to find the daughter nucleus to be in an excited state
Just like atoms ,nucleus also have energy levels
So an nucleus in excited state can make transitions from higher energy levels to lower one by the emission of electro magnetic radiation
The energy difference in allowed energy levels of a nucleus are of the order of Mev and the photons emitted by nuclei have energies of the order of Mev and are called γ rays
As an example,β decay of 60Co27 nucleus gets transformed into 60Ni28 nucleus in excited state which then de -excites to its ground state by successive emission of 1.17 Mev and 1.33 Mev gamma rays as shown in energy level diagram,
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