Koizumi, H., Sasaki, T. and Ichikawa, T. Radiation-Induced Chain Reactions in Alcohol Solutions of Diphenyliodonium Salts: A High-Sensitivity Chemical Dosimeter. Radiat. Res. 158, 241–246 (2002).

Chain reactions in γ-irradiated 2-propanol solutions of diphenyliodonium salts have been studied. Protonic acids were generated in the irradiated solutions with high yields, whereas acid formation as a result of thermal reactions was negligible. The solution can be used as a high-sensitivity chemical dosimeter. The G value of acidic protons increases with increasing concentration of diphenyliodonium salt at the lower concentrations because the reaction rate of a propagation reaction increases. However, the chain is limited by a termination reaction between phenyl radical and the iodonium salt: The G value shows a maximum value of 610 μmol J⁻¹ at the concentration of 0.08 mol dm⁻³ and decreases at higher salt concentrations.