Aurelian Quinet

Ambient Dose Equivalent Maps for Radioprotection

Abstract

Proton therapy does not differ from other domains in science and technology: new challenges always show up regularly. The last one is the ability to concentrate this technology in one unique room and the Belgian company Ion Beam Application has designed a facility responding to this issue : the ProteusOne. The purpose of this work is to draw the ambient dose equivalent map generated by the installation. Indeed, it must be ensured that the shielding of the ProteusOne meets the legal requirements in terms of dose limitations for the people working in it, and for the public working in the surrounding rooms of the medical institute. Data are collected from a prior simulation and an analysis of the particles population is proceeded: for each type of particle the distribution of energy is studied. Then the ambient dose equivalent is computed, thanks to an interpolation of the tabulated fluence-to-ambient-dose-equivalent conversion coefficients. Eventually, it is shown that the computation might spot simulations problems and the final results are discussed, globally and for each particle type.