Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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P. M. Pavlenko^1,*, O. V. Kashparova^1,2, S. Ye. Levchuk¹, M. O. Hrechaniuk¹, I. M. Gudkov¹, V. O. Kashparov<sup>1,2

1</sup> Ukrainian Institute of Agricultural Radiology, National University of Life and Environment Sciences of Ukraine, Kyiv, Ukraine
² Center for Environmental Radioactivity, Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway

^*Corresponding author. E-mail address: polina.pavlenko97@gmail.com

Abstract: Under natural conditions, in one of the most radioactively contaminated water bodies of the Chornobyl exclusion zone, lake Glyboke in 2020, experimental studies were carried out to assess the effectiveness of the use of additional "clean" feeding to reduce the levels of radioactive contamination of ⁹⁰Sr and ¹³⁷Cs in fish. The radiological efficiency of decreasing the ¹³⁷Cs intake into the muscle tissue of fish with the use of additional "clean" feeding, mainly due to biological dilution, was 2.9 ± 0.4 times. The biological half-life of ¹³⁷Cs in the muscle tissue of radioactively contaminated fish was 115 ± 25 days with the consumption of natural and additional "clean" food, which is approximately 2 times longer compared to the case when the fish consumes only clean food. In contrast to ¹³⁷Cs, using additional "clean" feeding led to an increase of ⁹⁰Sr content in the fish organism as compared to the control (up to 5 times) in proportion to the relative increase in the mass of fishbone tissue, which contains the bulk of strontium.

Keywords: ⁹⁰Sr, ¹³⁷Сs, Carassius gibelio, Chornobyl accident, radioactive contamination, permissible levels.

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