Cálculo del factor de corrección de la calidad del haz de la cámara de ionización PTW 30013 mediante simulaciones Monte Carlo

Abstract

his work presents a method based on Monte Carlo simulations to determine the beam quality correction factor of an ionization chamber. The Monte Carlo simulations were performed using the free access software GATE. The method was applied to the farmer type PTW 30013 ionization chamber; the results were validated comparing the values of the simulated factor, with those reported in the literature. The beam quality correction factor is necessary when it is desired to know the absorbed dose in water using a different radiation beam from the one used in the calibration of the ionization chamber. The dosimetry protocols have calculated some of these values for different ionization chambers and radiation qualities, based on theoretical and experimental results. However there are many models of cameras for which this factor is not properly calculated, limiting its use. The good results obtained with the proposed method for the PTW 30013 ionization chamber case suggest that it could be successfully applied to other camera models.