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Abstract
Natural geological systems, or natural analogues, provide a unique opportunity to test, by observation and measurement, many of the geochemical processes that are expected to influence the predicted reliability of high-level radiactive waste containment deep in the bedrock over realistically long periods of geological time. Within the Swedish programme such analogue investigations relate both to large-scale, multidisciplinary studies of complex geological systems, and to more specific studies, pertaining to a restricted set of physico-chemical parameters. These investigations have addressed the reliability of both the near-field (engineered barrier) and far-field (geological barrier) concepts for a disposal system.