Thesis: The thesis proposes to study the feasibility of the practical realization of this expertise will be used by the Laboratory for Dosimetry of Ionizing Radiation for the study of radiation protection positions. The work is divided into two main aspects: the first is the system of dosimetry which detectors will be included in the model and the second study (by simulation using a computer code Monte Carlo) the precision of estimates E for different configurations of radiation that could be achieved with our measuring instrument, taking into account all experimental constraints. The characterization of the detector has achieved a measure of dose approaching ± 30% dose deposited in the soft-tissue that make up the model for the energy range between 60 keV and 4 MeV. The Monte Carlo simulations were conducted from the voxelisation an existing physical model which has been modeled sensors placed at fixed locations in the theoretical study, adapted to our geometry. Thus, for irradiation homogeneous, heterogeneous and typical of a workstation, the instrumented dummy would estimate the effective dose E to ± 25% for the energy range 50 keV to 4 MeV. The added value of the dummy instrumented on the accuracy of the estimate of E has been demonstrated by comparing the values obtained for the personal dose equivalent Hp (10) for the configurations studied.