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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O. V. Kashparova^1,2,*, S. E. Levchuk², Yu. V. Khomutinin², P. M. Pavlenko², M. O. Hrechaniuk², V. O. Kashparov<sup>1,2

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

^*Corresponding author. E-mail address: elena.kashparova@gmail.com

Abstract: Throughout 2016 - 2021, a series of experimental studies on ¹³⁷Cs uptake and excretion rate constants for the silver Prussian carp (Carassius gibelio) were conducted in the Chornobyl exclusion zone (ChEZ) under natural conditions. To confirm the metabolic parameters of ¹³⁷Cs in the silver Prussian carp under strictly controlled conditions at different feed amounts real supporting laboratory experiments have been conducted. The excretion rate of the ¹³⁷Cs from the silver Prussian carp increased with increasing feed amount from 0.0068 ± 0.0003 day^-1 to 0.0085 ± 0.0005 day^-1 at water temperatures of 26 °C. The biological half-life of ¹³⁷Cs activity concentration in fish can be reduced by 2 times by increasing fish growth using clean feeding. The excretion rate of the ¹³⁷Cs from the silver Prussian carp agreed with data collected in natural conditions in the ChEZ during 2016 - 2020 at different water temperatures.

Keywords: ¹³⁷Cs, Chornobyl, freshwater fish, radioactive contamination, excretion rate, depuration rate, the concentration factor.

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