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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-423
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-423
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 Nov 2020

18 Nov 2020

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This preprint is currently under review for the journal BG.

Multi-compartment kinetic-allometric model of radionuclide bioaccumulation in marine fish

Roman Bezhenar1, Kyeong Ok Kim2, Vladimir Maderich1, Govert de With3, and Kyung Tae Jung4 Roman Bezhenar et al.
  • 1Institute of Mathematical Machine and System Problems, Glushkov av., 42, Kyiv 03187, Ukraine
  • 2Korea Institute of Ocean Science and Technology, Metropolitan city Busan, Republic of Korea
  • 3NRG, Utrechtseweg 310, 6800 ES Arnhem, the Netherlands
  • 4Oceanic Consulting & Trading, 403 Munhwa-building, 90 Yangpyong-ro, Seoul, Republic of Korea

Abstract. A model of the radionuclide accumulation in fish taking into account the contribution of different tissues and allometry is presented. The basic model assumptions are as follows: (i) A fish organism is represented by several compartments in which radionuclides are homogeneously distributed; (ii) The compartments correspond to three groups of organs/tissues: muscle, bones and organs (kidney, liver, gonads, etc.) differing in metabolic function; (iii) Two input compartments include gills absorbing contamination from water and digestive tract through which contaminated food is absorbed; (iv) The absorbed radionuclide is redistributed between organs/tissues according to their metabolic functions; (v) The elimination of assimilated elements from each group of organs/tissues differs, reflecting differences in specific tissues/organs in which elements were accumulated; and (vi) The food and water uptake rates, elimination rate and growth rate depend on the metabolic rate, which is scaled by fish mass to the 3/4 power. The analytical solutions of the system of model equations describing dynamics of the assimilation and elimination of 134Cs, 57Co, 60Co, 54Mn and 65Zn, which are preferably accumulated in different tissues, exhibited good agreement with the laboratory experiments. The developed multi-compartment kinetic-allometric model was embedded into the compartment model POSEIDON-R, which describes transport of radionuclides in water, accumulation in the sediment, and transfer of radionuclides through the pelagic and benthic food webs. The POSEIDON-R model was applied for the simulation of the transport and fate of 60Co and 54Mn routinely released from Forsmark Nuclear Power Plant (NPP) located on the Baltic Sea coast of Sweden and for calculation of 90Sr concentration in fish after the accident at Fukushima Dai-ichi NPP. Predicted concentrations of radionuclides in fish agree with the measurements much better than predicted using standard whole-body model and target tissue model. The model with the defined generic parameters could be used in different marine environments without calibration based on a posteriori information, which is important for emergency decision support systems.

Roman Bezhenar et al.

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Short summary
A new approach to predicting the accumulation of radionuclides in fish taking into account heterogeneity of distribution of contamination in the organism and dependence of metabolic process rates on the fish mass was developed. Predicted concentrations of radionuclides in fish agreed well with the laboratory and field measurements. The model with the defined generic parameters could be used in marine environments without local calibration, which is important for emergency decision support.
A new approach to predicting the accumulation of radionuclides in fish taking into account...
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