Factors controlling 226Ra, 228Ra and their activity ratio in groundwater – an application in Polish Carpathian mineral waters

Authors

  • Chau Dinh Nguyen AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland.
  • Mariusz Kopeć AGH University of Science and Technology, Faculty of Energy and Fuels, Al. Mickiewicza 30, 30-059 Kraków, Poland.
  • Jakub Nowak AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland.

DOI:

https://doi.org/10.7494/geol.2016.42.3.337

Keywords:

radium isotopes, groundwater, recoil effect, desorption/adsorption, Monte Carlo simulation, the Polish Carpathians

Abstract

The influences of aquifer formations and water chemical composition on the occurrence and activity ratio of radium isotopes in groundwater are discussed. Based on the model of desorption/adsorption processes of natural radionuclides in the rock-water system, the concentrations of radium isotopes and their activity ratio in groundwater are evaluated by the numerical Monte Carlo method (MC). In cases where the groundwater is of a similar age, limited flow (up to several meters/year), the physical conditions and the uranium and thorium activity ratios in host water formations are similar, the activity concentrations of radium isotopes (226Ra, 228Ra) and their activity ratio (226Ra/228Ra) are the highest in the water of high desorption coefficient for chloride sodium water (domination of Cl− , Na+ ions), medium in water of moderate desorption (bicarbonate water – HCO3 − , Ca2+) and the lowest in waters with a low desorption coefficient (sulfate ions prevailing – SO4 2−, Ca2−). The statements are well confirmed in the case of the natural mineral waters from the Polish Outer Carpathians. The total dissolved solids (TDS) of the Polish Carpathians waters varies from several hundred milligrams per liter to several tens of thousands milligrams per liter. The minimum, maximum and average concentrations of 226Ra, 228Ra and their activity ratio (226Ra/228Ra) are 82, 1340, 456 mBq/L, 19, 1240, 354 mBq/L and 0.89, 7.6 and 2.0 for chloride waters; 4, 140, 45.8 mBq/L, 12, 171, 62.7 mBq/L and 0.3, 1.7 and 0.70 for bicarbonate waters and 0.8, 9.3, 3.6 mBq/L, 5.3, 54, 20.1 mBq/L and 0.1, 1.0, 0.3 for sulfate ones, respectively. The desorption coefficients are the highest for the Cl-Na, moderate for the HCO3-Ca and the lowest for the SO4-Ca waters (in contrast to the adsorption properties of these waters).

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Published

2017-02-16

How to Cite

Nguyen, C. D., Kopeć, M., & Nowak, J. (2017). Factors controlling 226Ra, 228Ra and their activity ratio in groundwater – an application in Polish Carpathian mineral waters. Geology, Geophysics and Environment, 42(3), 337. https://doi.org/10.7494/geol.2016.42.3.337

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