Abstract
The microscopic information of ion track is essential in the field of the heavy-ion therapy for cancer treatment. The knowledge of effect on human tissue by heavy particle beam is used to develop a reliable medical system of treatment planning. For the deep understanding of the ion track structure in water target, we are developing a 3D Monte Carlo program. As the demonstration of the code for secondary electrons, we calculated electron track and examined the reliability of electron code in terms of electron ranges in water. And we have expanded this electron code to a the case of heavy ion incidence. The calculated ion track may imply a different nature of energy dependence from that interpreted by the macroscopic picture.
