{"title":"137Cs Migration and Profile in Bottom Sediments of Deep Drainage Lakes, North-Western Russia","authors":"N. A. Bakunov, D. Yu. Bolshiyanov, A. O. Aksenov","doi":"10.1134/S1066362223050090","DOIUrl":null,"url":null,"abstract":"<p>Modern contamination of lake–river systems bottom sediments with global and “Chernobyl” <sup>137</sup>Cs is estimated. Drainage lakes of North-Western Russia were investigated. Lake Kopanskoe, located south of the Gulf of Finland, is on the “Chernobyl” <sup>137</sup>Cs fallout plume, whereas Ladoga, Sukhodolskoe, Vuoksa, Imandra lakes are located at its periphery, in Karelia and Kola Peninsula. Following parameters are distinguished: lakes bottom <sup>137</sup>Cs contamination density (kBq/m<sup>2</sup>), distribution of <sup>137</sup>Cs in the profile of bottom sediments, <sup>137</sup>Cs diffusion coefficients (<i>D</i>) in bottom sediments and content of the exchange chemical form of the radionuclide. <sup>137</sup>Cs contamination of the lakes was formed due to suspended matter sedimentation with <sup>137</sup>Cs, <sup>137</sup>Cs sorption and diffusion in bottom sediments. With sedimentation ≥3 mm/year, the concentration of <sup>137</sup>Cs increased from the top to the bottom of the core (lakes Vuoksa, Ekostrovskaya Imandra), reflecting the gradual process of <sup>137</sup>Cs migration into the sediments. The opposite trend of <sup>137</sup>Cs concentration was observed in the bottom sediments of lakes Ladoga and Sukhodolskoe with sedimentation ≤0.5 mm/year. Here <sup>137</sup>Cs diffusion with <i>D</i> = (0.5–6.2) × 10<sup>–8</sup> cm<sup>2</sup>/s caused slow radionuclide transfer in the bottom sediments. The main inventory of <sup>137</sup>Cs was contained in the top layer 0–5 cm. In Lake Sukhodolskoye bottom sediments an absorbed <sup>137</sup>Cs in an exchange chemical form, extracted into 1 М NH<sub>4</sub>Aс solution, amount only 14.4–20%.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiochemistry","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S1066362223050090","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Modern contamination of lake–river systems bottom sediments with global and “Chernobyl” 137Cs is estimated. Drainage lakes of North-Western Russia were investigated. Lake Kopanskoe, located south of the Gulf of Finland, is on the “Chernobyl” 137Cs fallout plume, whereas Ladoga, Sukhodolskoe, Vuoksa, Imandra lakes are located at its periphery, in Karelia and Kola Peninsula. Following parameters are distinguished: lakes bottom 137Cs contamination density (kBq/m2), distribution of 137Cs in the profile of bottom sediments, 137Cs diffusion coefficients (D) in bottom sediments and content of the exchange chemical form of the radionuclide. 137Cs contamination of the lakes was formed due to suspended matter sedimentation with 137Cs, 137Cs sorption and diffusion in bottom sediments. With sedimentation ≥3 mm/year, the concentration of 137Cs increased from the top to the bottom of the core (lakes Vuoksa, Ekostrovskaya Imandra), reflecting the gradual process of 137Cs migration into the sediments. The opposite trend of 137Cs concentration was observed in the bottom sediments of lakes Ladoga and Sukhodolskoe with sedimentation ≤0.5 mm/year. Here 137Cs diffusion with D = (0.5–6.2) × 10–8 cm2/s caused slow radionuclide transfer in the bottom sediments. The main inventory of 137Cs was contained in the top layer 0–5 cm. In Lake Sukhodolskoye bottom sediments an absorbed 137Cs in an exchange chemical form, extracted into 1 М NH4Aс solution, amount only 14.4–20%.
期刊介绍:
Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.