The paper studies the concentration changing of the U(IV) and U(VI) species from uranium-bearing ores, resulted from the α radiolysis induced by an 241Am irradiation source. Thus, the α particles emitted by the 241Am source, much more intense than those resulting from the radioactive decay of uranium, would splits radiolytically the groundwater molecules present in the ores. The primary radiolysis products should initiate some redox processes upon the uranium species, changing their concentrations.