Electron track simulation using ETMICRO

A new Monte Carlo code ETMICRO (Electron Transport code for Micro-dosimetry) is now available for tracing the electrons down to 10 eV in liquid water. ETMICRO employs much the same frame of track construction as the previous programs except that the plasmon excitation is left out of consideration and thus there is no de-localisation of energy deposition. The inverse mean free path data and the corresponding differential values (DIMFPs) were prepared by adopting the Drude model parameters that were derived from a new optical data set for liquid water. The potential of electrons causing direct damage on DNA has been estimated as functions of the energy of electrons and their distance from DNA in an arbitrary direction. (authors)