Calculation of the Dose Distribution Near the Gantry of a Radiotherapy System

Data on the radiation loads of a radiotherapy system developed at NIITFA are presented. The main problems of the calculations are to establish the region in the mobile part of the system that is best suited for arrangement of blocks with electronics and to calculate the parameters of local radiation shielding that ensures fault-free operation of the electronics for the life of the system. The calculations were performed by the Monte Carlo method using the FLUKA software package.