Monte Carlo modeling of a X-ray tube for superficial radiotherapy for evaluating the beam quality and the depth-dose distribution

Abstract

The purpose of this study was to evaluate the possibility of using GEANT4 modeling package in the problems of dosimetry and treatment planning of superficial radiotherapy on the apparatus "Roentgen TA-02". Experimental measurements and calculation of half-value layer for beams in the regular operation modes, as well as depth dose distributions were carried out in accordance with the recommendations of American Association of Physicists in Medicine (AAPM). These parameters were compared with the results of the computer model of the x-ray tube. Comparison of partial half-value layer showed high efficiency of GEANT4 package in processing of physical processes associated with x-ray radiation and interaction with the matter. The data obtained during the work with the x-ray tube model are comparable both with the estimated results and published by other authors. The x-ray beams obtained in the simulation is comparable in quality with the real ones. The simulated and real beams coincide with the depth-dose distribution in the tissue equivalent medium with high accuracy.