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[en] The Fricke dosimeter, a widely used chemical dosimeter, is well understood in terms of the oxidation of ferrous ion in 0.8 N sulfuric acid solution by H atoms (via production of HO₂), OH radicals and H₂O₂ (Allen, 1961). The production of ferric ion is most sensitive to radical yields, especially H atoms, and is considerably less for heavy ions than for fast electrons. This difference is due to the increased importance of intratrack processes which enhance radical-radical recombination reactions producing molecular products as the linear energy transfer (LET = -dE/dx, i.e., stopping power) increases. The literature contains extensive data on radiolysis of the Fricke dosimeter with heavy ions, however, most of these studies were done with protons or alpha particles where the LET is relatively low (LaVerne and Schuler, 1987). These data are summarized here and combined with our own studies using ⁴He, ⁷Li, ⁹Be, ¹¹B, and ¹²C ions with energies up to 35 MeV. Differential yields are determined for these particles at specific energies and their dependence on track structure is discussed

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[en] Production of HO₂ (hydroperoxy radicals) was investigated using ¹H, ⁴He, ⁷Li, ⁹Be, ¹¹B, ¹²C, and ¹⁶O ions up to 5 MeV/nucleon, and ¹²C, ¹⁶O, and ⁵⁸Ni ions up to 16 MeV/nucleon and ²⁰Ne ions. HO₂ yield increases with increasing particle charge and can be considerably greater than with fast electrons. Differential HO₂ yield decreases with increasing particle energy

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