DISTRIBUTION OF RADIOCAESIUM IN THE BOTTOM SEDIMENTS OF THE KARA SEA
Author: Miroshnikov A. Yu.
Reference: Gazette “ГЕОЭКОЛОГИЯ, ИНЖЕНЕРНАЯ ГЕОЛОГИЯ, ГИДРОГЕОЛОГИЯ, ГЕОКРИОЛОГИЯ“ (Geoecology, engineering geology, hydrogeology, geocryology), 2012
ISSN: 0869-7803
DOI: 556.545
Keywords: sea, 137cs, bottom sediments, river, cesium, transfer
Abstract: The article presents the results of radiogeochemical studies carried out by IGEM RAS in the Kara Sea and the estuaries of Ob and Enisey rivers in 1995-2003, specifically on Akademik Boris Petrov research vessel. Based on the studies of circa 1500 samples of bottom sediments, obtained from 172 sea and rivers stations, 137Cs distribution map in the surface sediments was created. Four zones of radiocesium overactivity (> 15 Bk/kg) were identified: Novaya Zemlya Zone, Vaigach Zone, Ob Zone and Yenisei Zone. The allocated zones have different radiocesium concentration levels, as well as different infl ow sources, but all of them were generated under the influence of complex geochemical barriers. Based on the 47 sectioned cores of bottom sediments research, sampled in Ob Zone and Yenisei Zone overactivity zones, the distinct differences in vertical radiocesium distribution were identifi ed. It is evidenced that these differences are caused by oscillations of suspended silt discharge over the years, which are main transfer agents of radiocesium dissolvable and semi-dissolvable forms and doesn’t depend on sedimentation circumstances as well as on geochemical characteristics of depositing environment.
URL: http://elibrary.ru/item.asp?id=18152407
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