The interpretation of γ-radiation at the nuclear decay is based on the structure of the nuclei, that is, on two fundamental phenomena. First, on the inverse electric field of the proton and second, on the electric entity of the macroscopically neutral neutron, which behaves, at the nuclear scale, as a positively charged particle. The γ-radiation at the alpha decay (e.g. in radio Ra-226) can occur due to the neutrons synod (session), which reduces the negativity of the nuclear field and attenuates the connection of a nucleus He-4 (alpha particle), that exits the parent nucleus with the whole energy without γ-radiation or with less energy but with γ-radiation. Also, a beta decay β− can occur due to the neutrons synod in the nucleus (e.g. in boron B-12), resulting the emitted electron exits the parent nucleus with the whole energy without γ-radiation or with less energy but with γ-radiation. These strange phenomena will be explained.