[en] The yields of radicals in the γ-radiolysis of liquid acetic and propionic acids were measured using spin traps MN and BNB. These conclusions are compared with the yields of the end products CH₄, C₂H₆ and CO₂, inhibited by addition of spin traps. The reduction of the yields of the trapped radicals is due to charge transfer from dimeric radical cations of the acids to the traps. A correlation was obtained between the yields of trapped radicals and the ability of the traps to capture a positive charge. The ionic-molecular reaction of proton transfer within the dimer, followed by decarboxylation of the acyloxy radical, is the predominant process; the yields of alkyl radicals formed are equal to the yields of R·CO radicals, within the limits of error. 10 refs., 4 figs., 1 tab