The 60Co γ-radiolysis of aqueous solutions of sodium 9,10-anthraquinone-2-sulfonate has been studied in acidic, unbuffered, and alkaline conditions and with addition of N2O and 2-propanol. Mechanisms are proposed to account for the yields of H2O2 and hydroxylated anthraquinone sulfonates. In neutral solution, in the absence of O2, the OH• and e− adducts undergo preferential cross termination. Reduction of the OH• adduct leads to dehydration and regeneration of the quinone.