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Aerated aqueous solutions of 3,5-dihydroxytoluene (С7) irradiated with single electron pulses in the dark or under exposure to a light flux were studied by pulse radiolysis and high-performance liquid chromatography. The two types of high-energy particles, γ-rays and fast electrons, were compared. The complex mechanism of radiation-induced redox reactions occurring in the aqueous solutions of С7 and giving low-molecular and long-chain oxidation products was experimentally proved. Transient species of the radiation-induced oxidation of С7 that absorb light in the spectral range of 250–420 nm and have a lifetime longer than a millisecond were observed. [ABSTRACT FROM AUTHOR]