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, Russian   Periodicity: 4 times per year   Open access peer reviewed journal

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O. V. Kashparova^1,2,*, H. C. Teien², S. E. Levchuk¹, V. S. Pavlenko¹, B. Salbu², V. O. Kashparov<sup>1,2

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

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

Abstract: Freshwater fish such as Prussian carp (Carassius gibelio) don’t need a feed at a water temperature below 10 °С. To study the rate constants of ¹³⁷Cs excretion from the body of Prussian carp at different water temperatures (5 and 22 °С) and different feeding, the series of aquarium experiments were conducted. The half-life time of ¹³⁷Cs activity excretion from fish in the water (T = 5 °С) without feeding (T_1/2= 433 ± 162 days) was 5.6 times higher compared to the rate constants for water temperature 22 °С (T_1/2 = 78 ± 4 days) with different types of feeding. The temporal decline of ¹³⁷Cs activity (Bq) in fish was the same for different feeds, but the activity concentration of ¹³⁷Cs (Bq·kg^-1) in fish differed up to 1.8 times (0.0089 ± 0.0005 day^-1 and 0.016 ± 0.002 day^-1) due to different weight gains.

Keywords: ¹³⁷Cs, radioecology, Carassius gibelio, the Chornobyl accident, water ecosystems, radioactive contamination, permissible levels, concentration factor, the rate constant of uptake, rate constant of excretion.

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