[en] On the occasion of its 50. Anniversary, the A.T.S.R is holding its 5. European Forum on the theme of Decommissioning. Dismantling a plant or a site is a key milestone that involves many actors and partners as well as related companies, methods and savoir-faire. In order to reach this milestone successfully, it is important to demonstrate the ability to master the following: Safety, Security, Economic and Media related stakes, Technical and Human challenges. Radiophysicists must adapt to the wide range of partners and activities that always require more performing tools. It is also necessary to take radiation protection into account as early as possible and as much as possible, in the earliest days of a project to ensure appropriate monitoring both of plants and employees and to limit radiological impacts. The objective of this event is to offer all professionals of the nuclear industry the opportunity to discuss specific themes such as challenges of decommissioning operations, feedbacks, tools and techniques used to ensure compliance with radiation safety requirements. This document gathers the 37 available presentations of this event: 1 - Dismantling of nuclear facilities at the CEA-DEN (Nuclear Energy Direction); 2 - The nuclear safety authority (ASN) and the control of cleansing operations; 3 - The 2013/59/Euratom directive transposition in the French labor code; 4 - The organisation of CEA workers' radiation protection in the occupational safety; 5 - The radiation protection certification: experience feedback; 6 - Training evolutions in dismantling and cleansing; 7 - Challenges of an asbestos removal site; 8 - The CEA Marcoule asbestos removal pilot workshop of building 214; 9 - The asbestos risk in Marcoule's dismantling sites; 10 - Asbestos in nuclear areas and its laboratory analysis; 11 - Experience feedback of an open ground waste recovery and management; 12 - Radiation protection experience feedback during the dismantling and decommissioning of the LURE facility (INB 106); 13 - Report of 15 years of radiation protection at dismantling sites; 14 - Dismantling of the SVAFO research reactors R2 and R2-0 in Sweden; 15 - Validation principle of the dynamic containment of operation enclosures in contaminated environment; 16 - Visual survey and radiological measurements using drones (Intre Group); 17 - Airborne gamma mapping with Helinuc^TM; 18 - Presentation of the calculation methods from the book 'Calculation of doses generated by ionizing radiations' (EDP Sciences 2012); 19 - Radiological characterization of 232 coils from the CERN's Proton Synchrotron (PS) before being eliminated by the Andra; 20 - Development of reinforced intermediate canisters; 21 - Radiological mapping means; 22 - Kartotrak, an integrated software solution; 23 - Simulation for radiation protection; 24 - Manuela, a 3D real-time mapping and radiological tool; 25 - In situ lab for the on-site characterization of dismantling samples; 26 - Measurements and expertises; 27 - Business combinations: chance or necessity? 28 - Making the invisible visible for a better radiation protection during the entire life of EDF's nuclear facilities; 29 - Implementation of the Radiation Protection European Directive at CERN; 30 - CADOR: a structured approach applied to biological protections setting up; 31 - Maintenance and upgrade of Cern's accelerators: optimization of handling operations in radioactive environment; 32 - Radiological investigation of the RNG reactor with OSL/FO dosimetry prior to its dismantlement; 33 - Dismantling of the big components of the Phenix reactor; 34 - Innovations in control and measurement operations; 35 - Integrated Operational Dosimetry system at CERN; 36 - Investigation of 71.21 A, B and C tanks at Marcoule's UP1 facility; 37 - Implementation of the augmented reading time method of the residual signal for the dose reevaluation in thermoluminescence dosimetry