Changes in Radiation Exposure Rate of Fish of the Cooling Pond of the Chornobyl NPS and Lake Azbuchyn after Water Level Lowering

Q4 Environmental Science

Hydrobiological Journal Pub Date : 2023-01-01 DOI:10.1615/hydrobj.v59.i2.70

O. Kaglyan, D. Gudkov, V. V. Belyaev, S. Kireev, L. Yurchuk, V. Drozdov, N. Pomortseva, S. Pryshliak, O. Gupalo, I. Abramiuk, M. O. Men’kovska

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Abstract

Changes in the absorbed dose rate of external and internal exposure of the representatives of fish fauna of the cooling pond of the Chornobyl NPS and Lake Azbuchyn after the interruption of water supply into the cooling pond at the end of 2014 were investigated in 2014-2021. Changes in hydrological regime resulted in the decrease in water level in the cooling pond by 6.5-7.0 m, whereas in Lake Azbuchyn - by 2.5-3.0 m. In this case, 90Sr concentration activity in the water and biota increased. It has been found that in 2021 dose load from the incorporated 90Sr on fish of the cooling pond increased on the average by a factor of 4.5, whereas in Lake Azbuchyn - by a factor of 7.5 as compared to previous period (prior to a decrease in water level). The external dose rate for fish of the cooling pond remained almost unchanged, whereas in Lake Azbuchyn it increased as a result of replacing littoral and sub-littoral zones of the lake with the sections of the bottom characterized by an essentially higher level of radio-nuclide contamination.

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切尔诺贝利核电站冷却池和阿布琴湖水位下降后鱼类辐射暴露率的变化

2014-2021年调查了切尔诺贝利核电站冷却池和阿布金湖的代表性鱼类区系在2014年底冷却池供水中断后的外照射和内照射吸收剂量率变化。水情变化导致冷却池水位下降6.5 ~ 7.0 m，而Azbuchyn湖水位下降2.5 ~ 3.0 m。在这种情况下，水体和生物群中的90Sr浓度活性增加。已发现，在2021年，与前一时期(水位下降之前)相比，加入90Sr对冷却池鱼类的剂量负荷平均增加了4.5倍，而在Azbuchyn湖则增加了7.5倍。冷却池中鱼类的外部剂量率几乎保持不变，而在阿布奇恩湖，由于用放射性核素污染程度较高的湖底部分取代了湖泊的沿岸和次沿岸地区，外部剂量率增加了。

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来源期刊

Hydrobiological Journal Environmental Science-Ecology

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： This journal contains translations from the premier Russian and Eastern European periodicals in aquatic biology and aquatic ecosystems, supplemented by original articles from elsewhere. The journal publishes in the area of physiology, biochemistry, systematics, ecology and conservation of freshwater fish, invertebrates, vascular plants, zoo- and phytoplankton, as well as freshwater quality and toxicology. While most of the papers deal with inland waters, the journal also publishes articles reporting on expeditionary work, especially the Antarctic and tropical seas. Hydrobiological Journal is valuable to freshwater and marine biologists and chemists, limnologists, environmental scientists, oceanographers, and toxicologists.