he electrical conductivities (a) of pure and doped Cr203 samples were measured at a temperature range of 25-450°C and the activation energies were also calculated. The doping elements used were Li, Be, Mg, Zn, Ni, Sb and Ti in a concentration range of 0.01-2.0 atom- %. The first five cations have been seen to increase the electrical conductivity and decrease the activation energy (£,) of the pure Cr203, whereas, the last two cations (Sb and Ti) showed a reverse behaviour. All these observations have been interpretated and discussed in this publication. Moreover, the same determinations of electrical conductivity and activation energy were also achieved for the y-irradiated samples of pure Cr203 using two different doses of y-rays at the same range of temperature, 25-450°C. The values of the rate constant (k) of the recombination process of the defects produced by y-ir-radiation were determined at a temperature range of 500-1400°C and the E„ calculated was found to be 0.03 eV