[en] The first session of this colloquium concerned the nuclear fuel: elaboration of nanoparticles of actinide oxides, study of Na-U-O and Na-Np-O phase diagrams, relationships between precursors and sintering behaviour, study of uranium IV and thorium IV speciation. The second session addressed fuel processing: semi-quantitative analysis of metallic cations in organic phase, cathodic reduction of plutonium IV solutions, study of paramagnetism of actinide complexes, complexing of actinides III and IV, behaviour under alpha radiation of oximes and influence on redox properties of actinides. The third session addressed radionuclides and geosphere: study of the reactivity of surfaces of clayey phases, study of alpha-Al₂O₃/fulvic acid/Eu III interactions, determination of microscopic interactions between actinides and humic substances. Then, after a contribution of the evolution of the use of modelling tools of atmospheric dispersion and of the health and environmental impact in the support to the management of radiological emergencies, a fourth session addressed the relationship between radiochemistry and health: bio-accumulation and speciation of europium, mechanisms of interaction between actinides and a protein, speciation of (poly)molybdate and (poly)tungstate ions, study of astatine chemistry by means of quantum molecular modelling. The fifth session addressed storage safety: C¹⁴ diffusion in used fuel claddings, migration of deuterium in nuclear graphite, quantification of the production of radiolysis gas in radioactive waste parcels. The sixth session addressed tools for radiochemistry: advances on MARS (the beamline dedicated to radioactive materials at synchrotron SOLEIL), from radiolysis to radiochemistry (speciation of radio-elements under alpha and gamma radiation), presentation of γ3 (an electron/photon spectrometer with a high resolution and low background noise for the detection of ultra-traces of fission and activation products in the environment), analysis of wastes coming from the nuclear industry. Posters addressed the following issues: EF hand affins and uranium specific patterns engineering, Production of ⁶⁴Cu radionuclides, Plutonium electrochemical kinetics in nitric acid, Study of the self-radiolysis of tritiated water, Study of uranium complexing by phenylphosphonate, Synthesis, structure and solubility of Rhabophane as a monazite precursor, Determination of ⁹³Zr in radioactive effluents, Study of Tc redox in carbonate environment induced by radiolysis, Behaviour of rare gases in uranium-based nuclear fuels, Redox properties of Samarium in ionic liquids, Some chemical separations by chromatography developed for analytic purposes, Apatite composition effect (U-Th)/He thermo-chronometer, Coordination chemistry of uranium VI, In-situ Raman spectroscopy for the study of nuclear fuel salts, Dissolution of Thorium oxides, BDD/Si-PIN detector for direct spectrometry of actinides, Competition between chelating agents and identified target proteins of actinides, Nano-size metallic oxide cluster formation in Fe alloy by ion implantation.