FIG. 1.

Time evolution of the G value of Fe³⁺ from ⁶⁰Co irradiation of a Fricke solution, calculated using TOPAS-nBio (solid line). The reactions between ^•OH, HO₂^•, and H₂O₂ with Fe²⁺ that leads to Fe³⁺, and their reaction rate coefficients, are also shown. The arrows indicate the time stages when these reactions contribute to the G value. Simulated data from Plante (46) and accepted measured value from ICRU Report 34 (57) for ⁶⁰Co are shown as the dot-dashed line and the open circle, respectively.