Stepanets, Oleg V; Barisov, A; Ligaev, Alexander N; Solovjeva, Galina Y; Sisov, E; Komarevsky, V M (2012): Radionuclide measurements in sediments and water of the Kara Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.804512, Supplement to: Stepanets, OV et al. (2003): Radionuclides in the water column and surface sediments of the Ob and Yenisei rivers and adjacent Kara Sea shelf. In: Stein, R; Fahl, K; Fütterer, D K; Galimov, E M & Stepanets, O V (eds.), Siberian River Run-off in the Kara Sea: Characterisation, Quantification, Variability, and Environmental Significance, 488 pp. Proceedings in Marine Sciences, Elsevier, Amsterdam, 6, 149-161
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Abstract:
In this report, the results of a 2000-2001 radiogeoecological investigation are presented for the region of the Ob and Yenisei estuaries and the adjacent Kara Sea. In order to study the behaviour and migration of Cs, Sr and Pu radionuclides in a river - sea system experimental research on the distribution of these radionuclides in the water column and surface sediments has been carried out. In addition, the role of suspended and dissolved organic matter on the behaviour of radionuclides in water solutions has been studied.
The 137Cs and 239,240Pu concentrations in the upper 0-2cm layer of the sediments varied between 1,4 and 50,0 Bq/kg, with a mean of 12,4 Bq/kg, and between 0,065-1,96 Bq/kg, with a mean of 0,62 Bq/kg, respectively. There is a direct relationship of a specific radioactivity of 137Cs and 239,240Pu in the sediments and the content of clay fraction. The 137Cs, 90Sr and 239,240Pu concentrations in the water samples varied between 0,4 and 7,0 Bq/m**3 (mean of 3,6 Bq/m**3), 0,4 and 9,7 Bq/m**3 (mean of 3,3 Bq/m**3), and 0,01-0,3 Bq/m**3 (mean of 0,02 Bq/m**3), respectively. In the water samples the concentration of the water-soluble species l37Cs increases with increasing salinity, whereas the concentration of the 90Sr-radionuclide decreases with increasing salinity. This may be related to the physico-chemical behaviour of these radionuclides in water solutions and the influence of several sources on radioactive pollution in this basin. In sea water the suspended matter may absorb up to 10% 137Cs, 90Sr and 239,240Pu, in river water samples these values may reach 15-30%. More than 50% 90Sr and 239,240Pu is able to form complexes with dissolved organic matter. This effect is smaller in saline water.
The comparison of the data of 137Cs radioactivity in the surface sediments in 1995 and 2000-2001 showed that the level of radioactivity has decreased.
Project(s):
Siberian River Run-Off (SIRRO)
Coverage:
Median Latitude: 73.464283 * Median Longitude: 80.428281 * South-bound Latitude: 69.980933 * West-bound Longitude: 73.025600 * North-bound Latitude: 77.922800 * East-bound Longitude: 88.183300
Date/Time Start: 2000-09-06T04:20:00 * Date/Time End: 2001-09-11T04:57:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Stepanets, OV; Barisov, A; Ligaev, AN et al. (2012): Table 1: Results of lithological structure of some surface sediments and activity of 137Cs. https://doi.org/10.1594/PANGAEA.804509
- Stepanets, OV; Barisov, A; Ligaev, AN et al. (2012): Table 2: Results of measurement of Cs-137 in water. https://doi.org/10.1594/PANGAEA.804510
- Stepanets, OV; Barisov, A; Ligaev, AN et al. (2012): Table 3: Results of measurement of Strontium and Plutonium radionuclides. https://doi.org/10.1594/PANGAEA.804511