Native Copper Deposits and the Disposal of High-Level Waste

摘要: Highly radioactive, heat-producing waste contains radionuclides and generates daughter products that have half-lives as long millions of years. This high-level must be sealed from the biosphere for a very period in stable containers stored deep geological repositories. Copper has been seriously considered container material several waste-disposal projects. Native copper deposits may serve natural analogues chemically container-repository system. These formed terrestrial basalt-conglomerate sequences at temperatures approximately 100 to 200°C. The hydrothermal systems possessed oxygen fugacities below stability limit cuprite least 3 log units above magnetite-hematite buffer 100° C, 1 unit this 200 ° C. corresponds an fugacity range ≤10 units. fluids were characterized by low total sulfur activities high Cu-Cl ratios. Similiar conditions can expected exist th...