Modeling of gamma-ray radiolysis data at moderate and low solute concentrations in aqueous solutions

A radiation chemical model developed for use in pulse radiolysis studies employing high energy electrons has been applied to the calculation of yields in aqueous chemical systems irradiated with ⁶⁰Co γ-rays. The fit between model calculations and experimental data is almost within experimental error in most instances. Trends are accurately predicted where quantitative agreement is not found. Predictions of molecular yields of H₂ and H₂O₂ in the presence of scavengers of precursors of these molecules are in good agreement if an initial molecular yield is assumed for both molecules. Agreement between model predictions and experimental data is reasonable at low solute concentrations where back reactions of spur intermediates are important. The model appears to be useful in modeling steady state γ radiolysis as well as pulse radiolysis data. Implications of the model in predicting possible errors in rate constant determinations are discussed.