Modelling of the Behavior of Natural Radionuclides and the Environmental Risk in the Sites from the Mining Uranium Ore in Bulgaria

Rossitsa Ts. Petrova, Elena H. Tsvetkova*
University of Forestry, 10 Kliment Ohridski Blvd., 1797 Sofia, BULGARIA
*Corresponding author:
Abstract. In the article are included some parts of the results of the modelling of the behavior of the natural radionuclides and the risk for the environment for the technogenic soils formed after underground and open uranium ore extraction and zonal soil types in the area of 30 sites in the forests of Bulgaria (Stara Planina massif, Rila-Rhodope massif and Transko Kraishte). The modelling performed is based on the established strong negative linear correlations between the studied radionuclides and the pH. With reducing the acidity with one pH unit – the prognosis is for increasing the content of radionuclides (232Th - section "V shaft" mine, 238U - "Ribaritsa" mine, 40K, 232Th - "Yavorovets" mine, 40K, 232Th, 226Ra, 238U - "Selishte" mine, 226Ra, α-activity - "Zdravetz" mine). The environmental risk is significant due to the stimulation of the processes of weathering and release of pollutants. In conclusion, some good practice examples have been proposed as possibilities for reducing the environmental risk, following the re-cultivation of the "Kurilo" mine - "Iskra" section and the "V shaft" section. The technologies used in the re-cultivation are developed on the basis of the specific activity of 226Ra in the soil. These technologies can be used in sites with a similar activity of 226Ra in the soil.
Key words: model, radionuclides, mining uranium ore.

Ecologia Balkanica, 2019, Special Edition 2, pp. 155-163
Article № eb.19SE205 [Full text - PDF]pdf

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