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Ionizing radiation’s effects onto water molecules lead to the ionization and/or the excitation of them. Then, these phenomena are followed by the formation of radicals and molecular products. The linear energy transfer (LET), which defines the energy deposition density along the radiation length, is different according to the nature of ionizing particles. Thus, the values of radiolytic yields, defined as the number of radical and molecular products formed or consumed by unit of deposited energy, evolve according to this parameter. This work consists in following the evolution of radiolytic yield of molecular hydrogen and ferric ions according to the “Track-Segment” LET of ionizing particles (protons, helions). Concerning G(Fe 3+ ) values, it seems that the energy deposited into the Bragg peak does not play the main role for the Fe 3+  radiolytic formation, whereas for the G(H 2 ) it is the case with a component around 40% of the Bragg peak in the dihydrogen production. Therefore, as main results of this work, for high energetic Helion and Proton beams, the G(Fe 3+ ) values, which can be used for further dosimetry studies for example during the  α  radiolysis experiments, and the primary g(H 2 ) values for the Track-Segment LET, which can be used to determine the dihydrogen production by  α -emitters, are published.

Evolution of heavy ions (He 2+ , H + ) radiolytic yield of molecular hydrogen vs. “Track-Segment” LET values