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It has been widely recognised among researchers that speciation data are essential for proper and reliable modelling of radionuclide behaviour, which is studied inter alia in the context of radioactive waste management. Participants at the OECD/NEA workshop on "Evaluation of Speciation Technology" reviewed the various techniques used to identify different species of actinide and fission product elements present in nuclear waste and nuclear reprocessing streams. The review takes into account the advantages, disadvantages and limitations of the various methods in relation to their field of application. Recommendations for future R&D are also provided. These proceedings will primarily be of interest to chemists specialised in separation techniques and radioactive waste management experts.

Radioactive waste disposal in the ground -- Congresses. --- Radioactive waste disposal in the ground. --- Radioisotopes -- Speciation -- Congresses. --- Radioisotopes -- Speciation. --- Radioisotopes --- Speciation (Chemistry) --- Physical & Theoretical Chemistry --- Chemistry --- Physical Sciences & Mathematics --- Speciation --- Biochemical speciation --- Chemical speciation --- Radioactive isotopes --- Radioactive nuclides --- Radionuclides --- Chemistry, Analytic --- Isotopes --- Nuclear engineering --- Radioactive substances --- Radiochemistry --- Analytical chemistry --- Japan --- Nuclear physics

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Radioactive waste disposal in the ground --- Déchets radioactifs --- Congresses --- Elimination dans le sol --- Congrès --- Congresses. --- 622.333 --- -Burial of radioactive wastes --- Ground radioactive waste disposal --- Underground radioactive waste disposal --- Hazardous waste sites --- Waste disposal in the ground --- Radioactive waste repositories --- Coals. Black coal generally --- Burial of radioactive wastes --- 622.333 Coals. Black coal generally --- Déchets radioactifs --- Congrès --- Report --- Radioactive waste disposal in the ground - Congresses

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These workshop proceedings highlight the significant amount of work accomplished over the past decade in delivering transparent, proportionate regulation for geological disposal, and identify important differences between national regulations even if these are not in contradiction with international guidance. They also underline the importance of R&D carried out on behalf of the regulator. In addition to the contributed papers, these proceedings trace the numerous discussions that formed an integral part of the workshop. They constitute an important and unique documentary basis for researchers and radioactive waste management specialists. Themes addressed include duties to future generations, timescales for regulation, stepwise decision making, roles of optimisation and best available techniques (BAT), multiple lines of reasoning, safety and performance indicators, recognition of uncertainties and the importance of stakeholder interactions.

Radioactive waste disposal -- Risk assessment -- Congresses. --- Radioactive waste disposal in the ground -- Congresses. --- Radioactive waste disposal in the ground. --- Radioactive waste disposal. --- Waste gases -- Congresses. --- Waste disposal in the ground. --- Subsurface waste disposal --- Underground waste disposal --- Burial of radioactive wastes --- Ground radioactive waste disposal --- Underground radioactive waste disposal --- Refuse and refuse disposal --- Sewage disposal --- Hazardous waste sites --- Waste disposal in the ground --- Radioactive waste repositories

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Radioactive waste disposal in the ground --- Granite --- Formations (Geology) --- Congresses --- 621.1 --- -Granite --- -Radioactive waste disposal in the ground --- -Burial of radioactive wastes --- Ground radioactive waste disposal --- Underground radioactive waste disposal --- Hazardous waste sites --- Waste disposal in the ground --- Radioactive waste repositories --- Granitic rocks --- Igneous rocks --- Geologic formations --- Geological formations --- Stratigraphic formations --- Geology, Stratigraphic --- Heat engines in general. Generation, distribution and use of steam. Steam engines. Boilers --- Burial of radioactive wastes --- Congresses. --- 621.1 Heat engines in general. Generation, distribution and use of steam. Steam engines. Boilers --- Radioactive waste disposal in the ground - Congresses --- Granite - Congresses --- Formations (Geology) - Congresses

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GEOTRAP is the OECD/NEA Project on Radionuclide Migration in Geologic, Heterogeneous Media carried out in the context of site evaluation and safety assessment of deep repository systems for long-lived radioactive waste. Retention of radionuclides within the geosphere for prolonged periods is an important safety function of deep geologic disposal concepts for radioactive waste. The extent to which retention processes can be relied upon in repository performance assessment depends upon the existence of well-established theoretical bases for the processes. It also depends on support for the operation of specific retention processes, and models for their quantitative evaluation, from a wide range of laboratory and field experiments and observations from nature. The fifth GEOTRAP workshop, "Geological Evidence and Theoretical Bases for Radionuclide-retention Processes in Heterogeneous Media" held in May 2001, looked at radionuclide-retention processes and their consideration and representation in performance assessments. Current approaches to characterising and modelling retention processes, and suggestions for future improvements, were presented and discussed. In addition to the material presented during the workshop, this publication includes a technical synthesis reflecting the discussions that took place as well as the conclusions and recommendations made, notably during the working group sessions.

Radioactive waste disposal in the ground -- Congresses. --- Radioisotopes -- Safety measures. --- Radioisotopes in geology. --- Radioactive waste disposal in the ground --- Radioisotopes --- Radioisotopes in geology --- Environmental Engineering --- Civil & Environmental Engineering --- Engineering & Applied Sciences --- Safety measures --- Radioactive isotope geology --- Radioactive isotopes --- Radioactive nuclides --- Radionuclides --- Burial of radioactive wastes --- Ground radioactive waste disposal --- Underground radioactive waste disposal --- Isotope geology --- Isotopes --- Nuclear engineering --- Radioactive substances --- Radiochemistry --- Hazardous waste sites --- Waste disposal in the ground --- Radioactive waste repositories --- Sweden --- Radioactive Waste --- Isotopes radioactifs --- Isotopes radioactifs en géologie --- Congresses --- Sécurité --- Mesures --- Congrès