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Scaling of the energy distribution spectra. (a) direct energy distribution spectra of all ions (1000 MeV protons, 250 MeV/n helium, 290 MeV/n carbon, 325 MeV/n oxygen, 300 MeV/n silicon, and 1000 MeV/n iron ions) and target sizes (1, 2, 4, and 8 µm), normalized to the LET and radius in the energy axis, and to LET2 and radius in the frequency axis. (b) indirect energy distribution spectra, normalized to the target radius.
