A Test code to Calculate the trajectory of Charged Particals in a Medium under External Electric and Magnetic Fields

A computer code to calculate the trajectory of charged particles in a medium under external electric and magnetic fields was designed. Using this code, the trajectories considered the energy loss and the direction change of the primary particles determined by stopping power and Lorentz force respectively could be calculated. The results show the variation of trajectories as a function of kinetic energy and external fields. The code can be useful for finding the information about the enhancement of energy deposition in a medium irradiated by charged particle beam. Since only the energy loss and the direction change for primary particles are considered, there are errors in this calculation. However, the results can be applied to the study of dose enhancement in radiation therapy. More accurate calculations can be achieved by considering multiple scattering of primary particles and the effect of secondary particles.