Ecological Systems and Devices Annotation << Back ESTIMATION OF A RADIOECOLOGICAL SITUATION AND PECULIARITY OF CONNECTION BITUMEN HYDROCARBON STRUCTURES WITH CONCENTRATION OF NATURAL RADIONUCLIDES 226Ra, 232Th, 210Pb IN KARA SEA BOTTOM SEDIMENTS M.M. Domanov, E.G. Domanova, L.M. Parfenova The assessment of a background radioecological situation in the bottom sediments of the Kara Sea is executed. Content of natural radionuclides 226Ra, 232Th and 210Pb in a surface layer of sediments of the Kara Sea is investigated. Common average contents 226Ra, 232Th and 210Pb is 84±24 of Bq/kg. The gamma radiation dose from sediments varies within 0,030...0,084 μGr/h and average 0,056 μGr/h doesn’t exceed admissible safe level (0,057 μGr/h). Results of the defi nition of group structure of the bitumoids and concentration 226Ra, 232Th and 210Pb in the surface layer of sediments are compared. Positive correlation link of concentration 226Ra and 232Th with the content of paraffi n structures and negative communication 232Th and 210Pb with the content of naphthenic hydrocarbons is noted. In the sapropelic sediments positive correlation connection of contents of the long-chain polynuclear structures with depth is noted. It is shown that in sediments of sapropelic type the density of correlation of content of naphthenic hydrocarbons with concentration 232Th and 210Pb increases in comparison with sediments of the mixed type. Well expressed positive communication 226Ra, 232Th and 210Pb with polynuclear aromatic structures is shown. Keywords: radioecology; bottom sediment; hydrocarbon; radionuclides; Kara Sea. Contacts: E-mail: domanov@ocean.ru Pp. 37-44.