Gamma irradiation effects on the electrical conductivity behaviour of the double complexes [Co(NH3)6] [Co(CN)6], [Co(NH3)6] [Al(CN)6] and [Co(NH3)6] [Mn(CN)6] were investigated. A comparison is made between the rates and activation energies of thermal annealing of electrical properties of pure and γ-irradiated samples. The conductivity of the solid double complexes increases with temperature, decreases with radiation dose, and remarkably increases when the transition metal of the negative component of the double complex changes from Al to Mn to Co. However, the results show that the rate constants and activation energies of thermal annealing of defects in these systems are not significantly affected by gamma irradiations.