Ion beam pulse radiolysis study on intra-track reactions in aqueous solutions

A pulse radiolysis system using proton and He²⁺ beams with pulse duration of longer than 1 μs has been constructed at the HIMAC facility and used in radiation chemical studies. Radical yields decrease with an increase in LET,and scavenger systems to be used as probes must be examined carefully for the possibility of secondary reactions. The reliability of the dose evaluation in the present experiment was confirmed by the comparison of the results between steady state and pulse irradiation experiments. In addition, the aqueous methyl viologen solution containing formate was proposed as a promising chemical dosimeter in pulse and steady state irradiation with ion beams.