CURRENT RADIOACTIVITY STATE OF THE SOIL COVER IN OZERSK (THE CHELYABINSK REGION)
Author: KOSHELEVA N.E., TIMOFEEV I.V., VELICHKIN V.I., KASIMOV N.S., KUZMENKOVA N.V.
Reference: Gazette “ИНЖЕНЕРНЫЕ ИЗЫСКАНИЯ“ (Engineering survey), 2012
ISSN: 1997-8650
Keywords: RADIONUCLIDES, URBAN SOILS, TECHNOGENIC ANOMALIES, FUNCTIONAL ZONES, GEOCHEMICAL MAPS, ACCUMULATION AGENTS
Abstract: Describes spatial distribution regularities of 137Cs, 40K, 226Ra and 232Th are identified in the soils in Ozersk (the Chelyabinsk Region). Based on the data collected during a soil survey in 2010. Their anthropogenic and natural accumulation agents are revealed. The average amount of the natural radionuclides in the urban soils were close to the background values. The highest concentrations of 40K, 226Ra and 232Th were found in the industrial area of the town, their anomalous contents in the south-eastern part of Ozersk were characterized by their specific activity values of 450, 30 and 24 Bq/kg respectively. The content of 137Cs was twice the background level; the maximum accumulation of this radionuclide was observed in the undisturbed soils of the recreation area with natural forests where its average content was 164 Bq/kg. The spatial distribution of 137Cs was primarily controlled by the type of land use, 40K and 232Th – by the physical and chemical soil properties, 226Ra – by the vegetation type. The current radiation state of the soil cover in Ozersk was estimated as safe one: the average total effective specific activity in its territory was 17% of the rate, and the contamination density of 137Cs was 7,5% of the maximum permissible one in the Russian Federation.
URL: http://elibrary.ru/item.asp?id=17662120
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