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The effects of g-irradiation (0.2-1.6 MGy) on the particle size, specific surface area and catalytic activity of Co3O4 and NiO solids were investigated. The investigated solids were prepared by heat treatment of cobalt carbonate at 500 and 700 °C and basic nickel carbonate at 400 °C. The techniques employed were XRD, nitrogen adsorption at -196 °C and decomposition of H2O2 at 30-50 °C. The results...