Study on Microdosimetric Characteristics of 120MeV/u to 430MeV/u Carbon Ions

Microdosimetric single event spectra is a significant parameter in radiotherapy, which can be used to evaluate the biological effect of radiation fields. This paper simulated microscopic patterns of energy depositions for mixed radiation fields which are created by carbon ions with general purpose Monte Carlo code FLUKA. . Experimental measured lineal energy spectra produced by carbon ions of about 300MeV/u were chosen from literature to compared with the results from simulation one of the measurement set-up. In addition, the dose-weighted lineal energy spectra, frequency averaged lineal energy values and dose averaged lineal energy values of carbon ions from 120MeV/u to 430MeV/u of the measurement set-up were calculated, too. The results of this paper are meaningful for making treatment planning in carbon ion radiotherapy.