[en] The use of spin trapping to measure the yields of radicals in radiation chemistry is reviewed and its application to electron irradiated methanol and ethanol described. Solutions of nitroso-tert-butane in alcohols were cooled and passed continuously through the ESR spectrometer where they were irradiated with 3-MeV electrons. The relative yields of the alkoxy and hydroxyalkyl radicals were determined by double integration of the ESR spectra of the nitroxides resulting from spin trapping R. + t-BuNO → t-BuN(O.)-R. The ratio of hydroxyalkyl to alkoxy radicals was found to be 0.4 for both liquid methanol and ethanol