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oa Conditions of 90Sr Migration with Alkaline Groundwater at the Chornobyl Nuclear Power Plant Industrial Site
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 17th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Nov 2023, Volume 2023, p.1 - 5
Abstract
The conditions of 90Sr migration with strongly alkaline groundwater at the Chornobyl NPP industrial site are analyzed. In well 1-2A, in a strongly alkaline environment, volumetric activities increase by 5–100 times to 25–500 Bq/l. The observations were carried out as part of the radiohydroecological monitoring in the area of the New Safe Confinement - Shelter Object (NSC-SO).
The relationship between the concentrations of the main Ca2+, Na+ and K+ ions and the formation of high volumetric 90Sr activities in the observation well 1-2A was determined by the method of geochemical statistics.
According to the thermodynamic modeling data, complex 90Sr compounds formed in a strongly alkaline environment SrOH+ and SrCO30 were determined, the mobility of which with groundwater is much higher than that of 90Sr2+ cation.
It has been determined that the increase in ionic strength of solution (ISS) of groundwater from 2.5 to 8.12 mmol/L coincides with the beginning of the increase in groundwater pH from 7 to 11 and is ≈ 5 years ahead of the front of the spread of high 90Sr concentrations.