[en] The effect of temperature on the oxidation of Fe²⁺ in the gamma radiolysis of acidic ferrous sulfate solutions has been modelled using the stochastic IRT method, incorporating simulated electron track structures. There is an 11% increase in the Fe³⁺ yield in aerated 0.4 M H₂SO₄ solution on going from 298 to 573 K (25 to 300 deg. C). The H₂ yield in aerated solution increases about 24% from 0.41 at 298 K to 0.51 at 573 K. In the absence of oxygen, the increase in the yields of both Fe³⁺ and H₂ is about 12%. Calculated yields are consistent with available experimental data at room, and elevated temperatures. Simulations for heavy water (D₂₀) show similar temperature effects to those found for ferrous sulfate solutions in light water (H₂0). (author)