Relative radiation-chemical yields have been measured in the plateau and Bragg peak region of <tex-math>$3.9\ {\rm GeV}\ {\rm N}^{7+}$</tex-math> ions for two chemical systems. In one of these, aerated ferrous sulfate solution, there is a markedly greater effect of solute concentration in the plateau than in the peak. In both systems, chemical yields in the plateau are similar to those from helion or deuteron-irradiated solutions of lower LET. Both these effects are attributed to track-core expansion in the plateau region as compared to the peak region, brought about by the greater ion velocity in the former, as predicted by the Mozumder model for heavy ion tracks.

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