[en] The results are presented of studying radiolysis of organosulphurous compounds containing different functional groups: sulphohydryl, sulphide, carboxyl, hydroxyl, and others. The nature of radical and short-lived intermediate particles of radiolysis of dithiols, arylalkylthiols, arylalkylsulphides, and thioacetic acid has been studied by EPR and pulse radiolysis. Stable products of radiolysis of the compounds such as disulphides, cyclic sulphides, etc, have been identified. The contribution of individual functional groups into the protective action of bifunctional organosulphurous compounds from irradiation has been evaluated