Uso del código Fluka para el estudio comparativo entre el experimento y la simulación en la deposición de energía de materiales termoluminiscentes en haces de electrones externos.

Abstract

Measuring the absorbed dose with thermoluminescent dosimeters based on LiF in a body irradiated with electrons that have an energy of the order of MeV has the problem of the absence of electronic equilibrium and the impossibility of applying the Bragg-Gray approximation in this type of dosimeters. The present work uses Fluka software to simulate and contrast the results of the absorbed dose shown in the work of Ogunleye T. “An experimental Examination of Cavity Theory for Electrons”. The comparison shows that the simulation reproduces well the experimental values for the case of an aluminum phantom. In addition, the impact of the backscatter in the measurement of the absorbed dose is studied, it is studied by placing sidewalls of the same material in the dosimeters; results show that for materials with high atomic numbers (copper and lead) there is an increase of the maximum range. Also, within the framework of cavity theory, several and our theoretical approaches are evaluated for the theoretically defined stopping power, f1. However, the results show that most of these approximations only match f1 in the case of aluminum and almost none in materials with a high atomic number. Finally, we propose the approximation f’1 that considers the density difference between the medium and the detector; f’1 shows a high level according to f1 regardless of the mean atomic number.