The radioactive contamination study in south-western Greenland tundra in 2012-2013
| Autor: | Edyta Łokas, Anna Cwanek, R. Misiak, Maria Olech, Jerzy W. Mietelski, Robert Anczkiewicz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Radioactive Fallout
010504 meteorology & atmospheric sciences Health Toxicology and Mutagenesis Scientific expeditions Greenland 010501 environmental sciences Plutonium isotopes 01 natural sciences Chernobyl mosses Radiation Monitoring Radioactive contamination Soil Pollutants Radioactive Environmental Chemistry Lichen lichens Tundra Waste Management and Disposal 0105 earth and related environmental sciences Radionuclide Isotopes of uranium global fallout + SNAP 9A General Medicine Pollution radioactive contamination Plutonium Isotopic ratio Environmental chemistry Environmental science |
| Popis: | The paper presents results of the radioecological investigation carried out in south-western Greenland shoreline. There were examined over 50 samples of lichens and mosses collected from 7 locations during two scientific expeditions conducted in the summer of 2012–2013. The levels, trends and the most likely origin were determined for following natural and artificial radionuclides: 90Sr, 137Cs, 230, 232Th, 234, 238U, 238, 239+240Pu and 241Am. The radioactive pollution was found as relatively low, reaching the maximum values at: 25.3 ± 2.04 Bq/kg for 90Sr, 293 ± 27 Bq/kg for 137Cs, 4.01 ± 0.13 Bq/kg for 239+240Pu, 0.1381 ± 0.0070 Bq/kg for 238Pu and 1.90 ± 0.21 Bq/kg of 241Am, 9.15 ± 0.48 Bq/kg for 230Th, 25.1 ± 1.2 Bq/kg for 232Th, 7.5 ± 1.5 Bq/kg for 234U and 7.26 ± 0.80 Bq/kg for 238U. Both activity and mass isotopic ratio assays revealed dominant contribution of the global fallout + SNAP 9A on the presence of plutonium isotopes and 241Am in Greenland tundra. However, noticeable deviations of 241Am/239+240Pu and to a lesser extend of 240Pu/239Pu ratios from the GF level have been observed. The origin of 137Cs was evidently connected with the coexistence of global and Chernobyl fallout, while the presence of 90Sr was caused by nuclear weapon tests and affected by leaching process. The seaborne signature of uranium isotopes was manifested in research material as well. |
| Databáze: | OpenAIRE |
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