Cite this paper:
TERESHCHENKO Nataliya N., PROSKURNIN Vladislav Yu, PARASKIV Artem A., CHUZHIKOVA-PROSKURNINA Olga D.. Man-made plutonium radioisotopes in the salt lakes of the Crimean peninsula[J]. HaiyangYuHuZhao, 2018, 36(6): 1917-1929

Man-made plutonium radioisotopes in the salt lakes of the Crimean peninsula

TERESHCHENKO Nataliya N., PROSKURNIN Vladislav Yu, PARASKIV Artem A., CHUZHIKOVA-PROSKURNINA Olga D.
The A. O. Kovalevsky Institute of Marine Biological Research of the Russian Academy of Sciences, Sevastopol 299011, Russian Federation
Abstract:
Investigations of 239+240Pu and 238Pu in the surface layer (0-5 cm) of bottom sediment in the Crimean 10 salt lakes from 4 geographical groups were carried out for the first time. The 239+240Pu varied widely between regional geographical groups of lakes as well as within groups too and ranged from 11±4 to 451±43 mBq239+240Pu/kg. The highest levels of 239+240Pu—419±27, 443±24 and 451±43 mBq/kg were observed in the Yevpatoriya (Lake Kyzyl-Yar), the Tarkhankut (Dzharylhach) and the Kerch group (Tobechik), respectively. The lowest values of 239+240Pu were identified in three lakes of the Perekop group and were 20±12, 24±6 and 48±6 mBq/kg. In all lakes 238Pu was an order of magnitude lower than 239+240Pu and varied from 4.8±2.6 to 30.7±5.5 mBq/kg. The 238Pu activity was decay-corrected to 1986. The characteristic ratio of the 238Pu/239+240Pu activities in the sediment and percentage of the Chernobyl-derived Pu was calculated. The largest percentages of the Chernobyl-derived Pu were observed in the Evpatoriya group (Lake SasykSivash)—16.2%±8.26%, the Tarkhankut group (Dzharylhach)—8.4%±2.10% and the Kerch group (Aktash)—10.5%±5.56%. The study of the depth distribution of plutonium in the Lake Kyzyl-Yar bottom sediment core (0-25 cm) was fulfilled. It was shown that 239+240Pu was high enough in all studied layers of bottom sediment, but the highest activity ratio 238Pu/239+240Pu (0.062±0.020) was found in the deepest layer of 15-20.5 cm and the percentage of Chernobyl-derived Pu was estimated at 6.8%±2.85% in this layer.
Key words:    plutonium radioisotopes 238, 239+240Pu|bottom sediments|global fallout|Chernobyl accident|Crimean salt lakes   
Received: 2017-11-09   Revised:
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Articles by TERESHCHENKO Nataliya N.
Articles by PROSKURNIN Vladislav Yu
Articles by PARASKIV Artem A.
Articles by CHUZHIKOVA-PROSKURNINA Olga D.
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