Radionuclide speciation in sediments of the Yenisei River
| Autor: | Alexander Bolsunovsky |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Radionuclide
Renewable Energy Sustainability and the Environment business.industry Health Toxicology and Mutagenesis media_common.quotation_subject Extraction (chemistry) Public Health Environmental and Occupational Health chemistry.chemical_element Sediment Environmental availability Speciation Nuclear Energy and Engineering chemistry Caesium Environmental chemistry Environmental science Safety Risk Reliability and Quality Nuclear medicine business Waste Management and Disposal Transuranium element Isotopes of europium media_common |
| Zdroj: | Radioprotection. 46:S195-S198 |
| ISSN: | 1769-700X 0033-8451 |
| DOI: | 10.1051/radiopro/20116457s |
| Popis: | The examination of sediment samples collected from the Yenisei River revealed the presence of artificial radionuclides characteristic of radioactive discharges from the MCC facility: isotopes of europium ( 152 Eu, 154 Eu, and 155 Eu), cesium ( 137 Cs and 134 Cs), 60 Co, 90 Sr, and transuranium elements. Radionuclide concentrations in sediment layers remained high as far as 240 km downstream of the MCC. The vertical distribution of radionuclides in sediment cores was very complex, and down-core variations were due to different amounts of radionuclides released by the MCC and due to variations in the hydrologic conditions in the river. Sequential extraction performed on samples of the upper layers of the sediment core showed different degrees of potential environmental availability of artificial radionuclides: the amounts of extracted 90 Sr, 152 Eu and 241 Am were the largest (60–80% of initial activity), then followed 60 Co (30%), 238,239,240 Pu (15–30%), and, last, 137 Cs (5–15%). The distribution of 238 U among chemical fractions of sediments was similar to that of 60 Co and 238,239,240 Pu: 30–40% of 238 U initial activity was extracted. In a few samples, 241 Am was present in the unextractable form, which may be accounted for by the presence of microparticles of the reactor fuel. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|