Abstract
This study on Cs-137 from the Chernobyl accident was conducted in Lake Raaksjoen, an oligotrophic, mesohumic lake in central Sweden. The purpose was to determine the areal as well as the vertical distribution of Cs-137 in lake sediment and to see if the results could be explained by parameters such as morphometry of the lake, wind exposure, currents, wave action etc. Sediments cores were taken on 19 sites in March 1992 when the lake still was ice covered and these sampling-sites were spread all over the lake. The sediment cores were taken to the laboratory and sliced into 0.5-1 cm increments down to a sediment depth of 10 cm. The sediment increments were analysed on physical parameters such as density and water content and chemical parameters like C, N, Fe, Mn and Ca together with a measure of Cs-137 concentrations using a sodium iodine detector. The average concentration of cesium-137 in the sediment in Lake Raaksjoen was 30-35 kBq/m{sup 2}, which coincide with the amount deposited on the lake (30-40 kBq/m{sup 2}). There was a clear tendency for the concentration to increase with water depth, as a result of sediment focusing. The vertical distribution of Cs-137 was quite uniform for
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Citation Formats
Wass, E.
Distribution of Cs-137 in lake sediment; Foerdelning av Cs-137 i sedimentet i Raaksjoen, en mellansvensk skogssjoe, sex aar efter Tjernobylolyckan.
Sweden: N. p.,
1992.
Web.
Wass, E.
Distribution of Cs-137 in lake sediment; Foerdelning av Cs-137 i sedimentet i Raaksjoen, en mellansvensk skogssjoe, sex aar efter Tjernobylolyckan.
Sweden.
Wass, E.
1992.
"Distribution of Cs-137 in lake sediment; Foerdelning av Cs-137 i sedimentet i Raaksjoen, en mellansvensk skogssjoe, sex aar efter Tjernobylolyckan."
Sweden.
@misc{etde_10126956,
title = {Distribution of Cs-137 in lake sediment; Foerdelning av Cs-137 i sedimentet i Raaksjoen, en mellansvensk skogssjoe, sex aar efter Tjernobylolyckan}
author = {Wass, E}
abstractNote = {This study on Cs-137 from the Chernobyl accident was conducted in Lake Raaksjoen, an oligotrophic, mesohumic lake in central Sweden. The purpose was to determine the areal as well as the vertical distribution of Cs-137 in lake sediment and to see if the results could be explained by parameters such as morphometry of the lake, wind exposure, currents, wave action etc. Sediments cores were taken on 19 sites in March 1992 when the lake still was ice covered and these sampling-sites were spread all over the lake. The sediment cores were taken to the laboratory and sliced into 0.5-1 cm increments down to a sediment depth of 10 cm. The sediment increments were analysed on physical parameters such as density and water content and chemical parameters like C, N, Fe, Mn and Ca together with a measure of Cs-137 concentrations using a sodium iodine detector. The average concentration of cesium-137 in the sediment in Lake Raaksjoen was 30-35 kBq/m{sup 2}, which coincide with the amount deposited on the lake (30-40 kBq/m{sup 2}). There was a clear tendency for the concentration to increase with water depth, as a result of sediment focusing. The vertical distribution of Cs-137 was quite uniform for all sampling-sites with a peak about a centimeter down in the sediment and then decreasing concentrations downwards to a negligible value not affected by the Chernobyl accident at a sediment depth of 10 cm. There were no connections found between cesium content and other substances analysed.}
place = {Sweden}
year = {1992}
month = {Dec}
}
title = {Distribution of Cs-137 in lake sediment; Foerdelning av Cs-137 i sedimentet i Raaksjoen, en mellansvensk skogssjoe, sex aar efter Tjernobylolyckan}
author = {Wass, E}
abstractNote = {This study on Cs-137 from the Chernobyl accident was conducted in Lake Raaksjoen, an oligotrophic, mesohumic lake in central Sweden. The purpose was to determine the areal as well as the vertical distribution of Cs-137 in lake sediment and to see if the results could be explained by parameters such as morphometry of the lake, wind exposure, currents, wave action etc. Sediments cores were taken on 19 sites in March 1992 when the lake still was ice covered and these sampling-sites were spread all over the lake. The sediment cores were taken to the laboratory and sliced into 0.5-1 cm increments down to a sediment depth of 10 cm. The sediment increments were analysed on physical parameters such as density and water content and chemical parameters like C, N, Fe, Mn and Ca together with a measure of Cs-137 concentrations using a sodium iodine detector. The average concentration of cesium-137 in the sediment in Lake Raaksjoen was 30-35 kBq/m{sup 2}, which coincide with the amount deposited on the lake (30-40 kBq/m{sup 2}). There was a clear tendency for the concentration to increase with water depth, as a result of sediment focusing. The vertical distribution of Cs-137 was quite uniform for all sampling-sites with a peak about a centimeter down in the sediment and then decreasing concentrations downwards to a negligible value not affected by the Chernobyl accident at a sediment depth of 10 cm. There were no connections found between cesium content and other substances analysed.}
place = {Sweden}
year = {1992}
month = {Dec}
}