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Hot particles of the Yenisei River flood plain, Russia [Text] / A. Y. Bolsunovsky, V. O. Tcherkezian // J. Environ. Radioact. - 2001. - Vol. 57, Is. 3. - P. 167-174, DOI 10.1016/S0265-931X(01)00021-2. - Cited References: 12 . - ISSN 0265-931X

РУБ Environmental Sciences
Рубрики:
CONTAMINATION
CHERNOBYL
ACCIDENT
Кл.слова (ненормированные):
hot particles -- Yenisei river -- plutonium complex -- caesium and plutonium isotopes -- dating of particles
Аннотация: Some high-activity hot particles (HP) were found in the flood plain of the Yenisei River, near the Krasnoyarsk Mining-and-Chemical Combine (MCC). and their radionuclide compositions were determined. The ratios of plutonium and caesium isotopes in the particles are indicative of their reactor origin. The Cs-137 activity of the particles amounts to 29,200 kBq/particle, which is higher than the corresponding activities of the fuel particles that formed as a result of the accident at the Chernobyl NPP, All the particles have been divided into two major groups according to the Cs-137/Cs-134 ratio: in the first group, the Cs-137/Cs-134 ratio is more than or equal to 3000, and in the second the Cs-137/Cs-134 ratio is less than or equal to 1000. The particles of the first and the second groups were preliminarily estimated to be formed 30 and 20 years ago, which suggests that there must have been at least two accidents at the MCC reactors, with part of the fuel released into the Yenisei River. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Держатели документа:
RAS, SB, Inst Biophys, Krasnoyarsk 660036, Russia
RAS, Vernadsky Inst Geochem & Analyt Chem, Moscow 117975, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Bolsunovsky, A.Y.; Tcherkezian, V.O.

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Long-term trends and speciation of artificial radionuclides in two submerged macrophytes of the Yenisei River: A comparative study of Potamogeton lucens and Fontinalis antipyretica / T. Zotina, D. Dementyev, Y. Alexandrova // J. Environ. Radioact. - 2021. - Vol. 227. - Ст. 106461, DOI 10.1016/j.jenvrad.2020.106461. - Cited References:37. - The authors are grateful to the staff of the Radioecology Laboratory and the head of the Laboratory, Dr. Alexander Bolsunovsky, to the staff of Analytical Laboratory (Institute of Biophysics SB RAS) for their help in sample collection and measurement and to Elena Krasova for linguistic check and improvements. We also appreciate comments of anonymous reviewers, which allowed us to improve our manuscript. The research was supported partly (in 2018-2020) by the grant of Russian Foundation for Basic Research and Krasnoyarsk Regional Scientific Foundation No.18-44-240003. . - ISSN 0265-931X. - ISSN 1879-1700

РУБ Environmental Sciences
Рубрики:
HEAVY-METALS
   BRYOPHYTES
   CONTAMINATION
   BIOMASS
   PLANTS
   CS-137
   TOOL
Кл.слова (ненормированные):
Radiocesium -- Effective half-life -- Correlation with discharge -- Epiphytic -- biofilm -- Biomonitor -- Bioindicator
Аннотация: Long-term trends of artificial radionuclides, from 2003 to 2018, in two abundant species of macrophytes, shining pondweed, Potamogeton lucens, and water moss, Fontinalis antipyretica, have been analyzed to estimate the indicative reliability of these two species as biomonitors of radioactive contamination in a river system and to quantify the decrease in the content of artificial radionuclides in the Yenisei River. Time-dependent trends of artificial radionuclides in the biomass of these species were similar, resulting in estimates of effective half-lives for Mn-54, Co-58, Co-60, Zn-65, Cs-137, and Eu-152 similar for both species. Concentrations of artificial radionuclides in biomass of shining pondweed and water moss correlated with annual discharges of the radionuclides to the Yenisei at different levels of significance, and the strongest (R-2 > 0.7) positive correlation (p < 0.05) was obtained for Co-60, Zn-65, and Eu-152. Concentrations of Co-60, Cs-137, and Eu-152 in water moss were 2-7.5 times higher than in shining pondweed, and considerable percentages of those isotopes were recorded in extracellular particulate matter, which was largely represented by epiphytic diatoms. Higher concentrations of artificial radionuclides in the biomass of water moss can be considered as an advantage of water moss as a monitor of radioactive contamination of the Yenisei, while shining pondweed is more useful for estimation of annual deposits of radionuclides in vegetation of the Yenisei and spatial transfer of radionuclides downstream of the discharge site. Despite differences in concentrations of artificial radionuclides, both species can be considered as reliable indicators of radioactive contamination of the river on a long-term scale.

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Держатели документа:
RAS, Krasnoyarsk Sci Ctr SB, Fed Res Ctr, Inst Biophys, 50-50 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, 79 Svobodny Ave, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Zotina, Tatiana; Dementyev, Dmitry; Alexandrova, Yuliyana; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Regional Scientific Foundation [18-44-240003]

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