[en] An investigation has been carried out into the quenching of the excited states of liquid saturated hydrocarbons following irradiation with high-energy radiation. The time dependence of the specific rate of reaction of the solvent excited state with quenchers, the reaction radius and the sum of the diffusion coefficients of the reacting species are determined. The time dependence of the fluorescence intensity resulting from irradiation with a short pulse of high-energy electrons was investigated and the total fluorescence yield was studied. The processes are considered, the experimental method described and the results presented. (Auth. /C.F.)