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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

The A. O. Kovalevsky Institute of Marine Biological Research of the Russian Academy of Sciences, Sevastopol 299011, Russian Federation
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.
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