High spatial resolution microdosimetry with ΔE-E detector on C-12 beam: Monte Carlo simulations

Abstract

The response of ΔE-E telescope in C¹² ion beam at defined positions within the Bragg peak at different depths with 0.5mm step was studied using Geant4 Monte Carlo toolkit. The microdosimetric spectra derived from ΔE stage response using assumption that average chord is 1.8 μm along with simulated scatter plots for the same points. It was demonstrated that microdosimetric spectra is changing dramatically within 0.5 mm depth increments close to and at distal part of the BP that is impossible to observe with TEPC. Fragments (He⁴, He³, Li⁷, Be⁹, B¹¹) and neutrons contributed to microdosimetric spectra and to YD have been analyzed for each position.