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137Cs activity in Sweden after the Chernobyl Nuclear Power Plant accident in relation to quaternary geology and land use

Tondel, Martin, Granath, Göran, Wålinder, Robert
Applied geochemistry 2017 v.87 pp. 38-43
accidents, agricultural land, cesium, epidemiological studies, forests, geochemistry, land use, nuclear power, organic soils, power plants, radionuclides, sand, urban areas, Sweden
After the Chernobyl Nuclear Power Plant accident ¹³⁷Cs was deposited in Mid-Sweden, with the highest activity in Gävle municipality. We compared aerial measurements of ¹³⁷Cs on the ground over time in Gävle municipality since 1986. Maps of soil types and land use were used to analyse the decrease in activity of ¹³⁷Cs. A spatial pattern was identified where the reduction of activity was greater in sand than in organic soil. For land use the reduction was greater in urban areas than in forests, with agricultural land in between. Long-term external radiation from ¹³⁷Cs depends not only on the physical decay of ¹³⁷Cs but also indirectly on geology, and this should be considered when calculating external radiation doses to individuals in epidemiological studies.