Before revision:  For this simulation it is also taken into account the indirect damage as a product of the free electrons and radicals from the water effects. The information of the spatial distribution of the electrones is obtained form Geant4 and afterwards it is implemented in Matlab where rays are created with tri-dimensional random trajectories through Monte Carlo simulations.
After revision:  For this simulation it is also taken into account the damage caused by free electrons generated by the effect of the interaction with the water molecules, this is different to the effect considered in radiobiology, where indirect damages are due to chemical reactions. The spatial distribution of the electrones is obtained form Geant4 and afterwards it is implemented in Matlab where rays are created with tri-dimensional random trajectories through Monte Carlo simulations.