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Natural Analogue Aspects of Radionuclide Transport in the Geosphere

Natural analogues give very useful information on the transport mechanisms of radionuclides through the geosphere. We show in particular that they help answer basic questions concerning fluid flow paths, water/rock interactions, chemical forms of radionuclides, processes of elemental retardation and major geochemical parameters. In addition, natural analogues can play a unique role for the validation of models and for the communication of scientific results to the general public, notably on the safety of nuclear waste disposal.