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Preliminary studies on natural radioactive nuclides in thermal waters

100%

Chau N. D. , Nowak J.

tom Vol. 57, No. 4

591-595

The paper summaries the data of activity concentrations of uranium, radium isotopes, mineralization and temperature of thermal waters. The data were gathered not only from our measurements of thermal waters occurring in the Polish Carpathians, but also from the attained published references in the world. The graphical relations between concentrations of the uranium and radium isotopes in thermal waters and their parameters such as temperature and mineralization were drawn up and discussed. The relation between the contents of 226Ra and 228Ra for the investigated waters was also analysed. The relations show that the influence of temperature on the mineralization and radioactive elements in thermal waters is complicated.

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

80%

Chau N. D. , Kopeć M. , Nowak J.

2016

tom Vol. 42, no. 3

337--351

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-, Ca 2-). 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 SO3-Ca waters (in contrast to the adsorption properties of these waters).