The reactor accident at chernobyl: A possibility to test colloid-controlled transport of radionuclides in a shallow aquifer |
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| Institution: | 1. USDA Forest Service, Missoula Fire Sciences Laboratory, Rocky Mountain Research Station, Forest Service, United States Department of Agriculture, 72510 Coyote Road, Pendleton, OR 97801, USA;2. USDA Forest Service, National Headquarters, Fire and Aviation (retired), Washington, DC, USA;3. National University of Life and Environmental Sciences of Ukraine, 15, Geroiv Oborony Street, Kyiv 03041, Ukraine;4. National University of Life and Environmental Sciences of Ukraine, 15, Geroiv Oborony Street, Kyiv 03041, Ukraine;5. Oregon State University, College of Forestry, Forest Ecosystems & Society, 321 Richardson Hall, Corvallis, OR 97331, USA;6. Institute of Forestry, Republic of Belarus, Gomel, 71, Proletarskaya Street, Gomel 246001, Belarus;7. Ukrainian Research Institute of Forestry and Forest Melioration, Pushkinska street, Kharkiv 03041, Ukraine;8. Institute of Mathematical Machines and Systems NAS of Ukraine, prosp. Glushkova, 42, Kiev 03187, Ukraine;9. Portland State University, Department of Environmental Sciences and Management, Portland, OR, USA;1. Institute of Meteorology and Water Management – National Research Institute, Maritime Branch, Waszyngtona 42, 81–342 Gdynia, Poland;2. Central Laboratory for Radiological Protection, Konwaliowa 7, 03–194 Warsaw, Poland |
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| Abstract: | Radioactive fall-out from the damaged nuclear power station at Chernobyl (USSR) has been measured in May 1986 in the River Glatt (Zürich, Switzerland) and in a shallow groundwater stream. This aquifer is hydraulically connected to the river and recharged by river water. Ruthenium-103, I-131, Te-132, Cs-134 and Cs-137 were measured several times using gamma-ray spectroscopy. By filtration through 0.45 μm, 0.2 μm and 0.05 μm filters the radionuclides were partitioned between solution (filtrate < 0.05 μm) and particles/colloids.In the river, the main radioactivity for all the investigated nuclides was found in the water passing the 0.05 μm filter. Among the particulates the highest radioactivity was detected in the fraction > 0.45 μm, the two smaller sizes contributing only little.In the water infiltrating into the groundwater Ru-103, I-131 and Te-132 were found almost exclusively in the filtrate (< 0.05 μm). No Cs-134, 137 was detected in this fraction indicating complete sorption on the aquifer material during infiltration. Only a very small radioactivity was found on colloids > 0.05 μm suggesting their retention by the heterogeneous glaciofluvial outwash deposits (stones, gravel, sand, clays). |
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