[en] Radiation protection optimization is mainly based on the research of an equilibrium between dose reduction and economical viability, and on the reduction of exposure with limitation of inequality between individual dose distribution. Application of this optimization principle (ALARA) induces that a complement to an a posteriori control radioprotection is implemented such as an a priori management radioprotection: settling of dosimetric objectives during preparation stage, performance follow-up and corrective actions when gaps are detected, and feedback experience at the achievement of operations