It is well known that, when accelerated electrons from a linear accelerator interact with a high
atomic number (Z) target material, electromagnetic radiation (bremsstrahlung) is produced. In the
present work some aspects of the generation of the bremsstrahlung radiation by linear accelerators
of electrons are studied, namely the relation between the dose and parameters of the accelerating
structure and beam characteristics is investigated. We carry out numerical simulations of the relative
dose rate at fixed maximal beam energy and analyze its dependence on the length of the
accelerating cells, power of the electromagnetic field dissipated in them and average energy and
energy spread of the output beam. The simulation of the acceleration of the electrons in the
accelerator is done with the RTMTRACE code
