Fig. 5.

The linear-quadratic (LQ) views of five fractions of carbon-ions effect on normal lung tissue compared to five-fractions photons as reported previously. The negative natural logarithm transformed FI values are plotted against a function of the total prescribed doses. The observed biological effects of carbon-ions differed prominently from photons, indicating a significantly intensified role on normal lung tissue. Five-fraction carbon-ions doses are shown as solid squares; the gray solid circles for five fractionated photons as a reference. The reference photons 5-fraction data were from the previous report [22] and therefore shown in in gray dash lines.