<p>This study investigated the radiolytic behavior of aerated aqueous hydrazine solutions (N₂H₄) under γ-irradiation, focusing on the effects of various factors such as the initial concentration of hydrazine, absorbed dose, concentration of H₃BO₃ and ammonia. We measured pH values, the concentrations of N₂H₄, H₂O₂, nitrogen oxides (NO₂⁻ and NO₃⁻), and gaseous radiolytic products (such as H₂ and N₂) before and after irradiation. The radiolysis of N₂H₄ was influenced by its initial concentration and the absorbed dose. When N₂H₄ remained in the solution, no H₂O₂ was formed after irradiation, which was attributed to the strong reducing ability of N₂H₄ and its effective scavenging of O₂, ·OH, and H₂O₂. H₃BO₃ effectively protected N₂H₄ from radiolytic decomposition. Variations in the addition of ammonia did not significantly affect the radiolysis process of hydrazine solutions. By collecting the elementary reaction sets of pure water radiolysis and hydrazine radiolysis, we developed a computational model (N₂H₄–H₂O_Rad) for the radiolysis of hydrazine solutions using FACSIMILE simulation software (MCPA Co., Ltd.). The simulation results closely matched the experimental data, demonstrating the validity and accuracy of the computational model.</p>