Some highlights on the isotope geochemistry studies within the Swedish research program on radioactive waste disposal |
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| Institution: | 1. CNR-IGG (Institute of Geosciences and Earth Resources), G. Moruzzi, 1, 56124 Pisa, Italy;2. Department of Earth Sciences, University of Florence, Via G. La Pira, 4, 50121 Florence, Italy;3. CNR-IGG Institute of Geosciences and Earth Resources, Via G. La Pira, 4, 50121 Florence, Italy;4. TerreLogiche Srl, Via G. Verdi, 3, 57021 Venturina Terme, Livorno, Italy;1. Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, P.O. Box 210038, Tucson, AZ, USA;2. Department of Hydrology and Water Resources, University of Arizona, Harshbarger Building #11, Tucson, AZ, USA;3. Engineering Institute, Autonomous University of Baja California, Mexicali, Baja California, Mexico;4. New Mexico State University, Las Cruces, NM, USA;1. Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, South Korea;2. Department of Earth and Environmental Sciences and Green School, Korea University, Seoul 136-701, South Korea |
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| Abstract: | A total of nine sites have been sampled for groundwater, down to vertical depths of more than 800 m, in the course of the Swedish program for the investigation of potential high level radioactive waste repository locations in crystalline rock.14C and13C in carbonate ions, and18O, deuterium and tritium in water have been regularly measured. All groundwaters are of meteoric origin, infiltrated during the same or a cooler climate. Representative samples of deep groundwaters are characterized by both a very low, or below detection limit, content of tritium and by calculated14C ages of about 10 000 years or older. A new sampling technique is being developed. One of the investigation sites, Finnsjön, is subjected to additional groundwater sampling as part of an ongoing fracture zone project.Groundwater from granitic rocks is also being sampled and investigated within the framework of the international OECD/NEA project at the Stripa mine. Water has been sampled at depths of more than 900 m. A large number of relatively new isotope methods are being tested and evaluated.A repository for low- and medium-level radioactive waste from reactor operations is being built in Forsmark, 50–130 m under the sea bed. The groundwater in the facility has a composition different from the groundwater on land and different from the sea above: it is more saline than the seawater and has an intermediate18O content, as compared to seawater and groundwater on land.Work has been initiated to investigate the dispersion of the fallout nuclides from the Chernobyl accident at the investigation sites at Gideåand Finnsjön. |
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