Simulation of a medical linac with evaluation of dose profiles behind an electron applicator

Cancer therapy with electrons requires a well defined electron beam. Especially a flat dose profile in the tissue is important for the treatment planning. The normal, healthy tissue should be harmed as little as possible. Therefore the understanding of the physical properties behind the linear accelerator is of outstanding importance. A simulation provides an elegant access to the track of the electrons and gamma rays towards the patient. The simulation was performed with the Monte Carlo simulation tool Geant4. The setup of a real apparatus was implemented with multiple regions for the evaluation of doses and spectral analysis. The results of the simulation provide the possibility to test new designs before prototyping.