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In this work, a study of the radioactive content of some spring and bottled mineral waters originating from metamorphic rock areas was carried out. A high content of radium isotopes ( 226 Ra, 228 Ra), was found by radiometric analysis in the spring waters: Studenica ( 226 Ra: 289 mBq/L), Cibutkovica ( 226 Ra: 92, 4 mBq/L, 228 Ra: 610 mBq/L), and Crni Guber ( 226 Ra: 120 mBq/L, 228 Ra: 1170 mBq/L). On the other hand, the radiochemical results showed a higher concentration of 238 U in the bottled mineral water samples (dissolved uranium concentrations were from 0.21 mBq/L, for "Kopaonik" to 71.5 mBq/L fo "Skadarska") than in the spring water samples (dissolved uranium concentrations were very low ≈ 10 mBq/L). The concentrations of all the present naturally occuring radionuclides: 238 U, 234 U, 232 Th, 230 Th, 225 Th, 228 Ra and 226 Ra were determined by alpha/gamma spectrometric analysis. The activity ratios 234 U/ 238 U, 226 Ra/ 230 Th and 228 Th/ 232 Th, 228 Ra/ 228 Th were calculated and are discussed as an indication of the radioactive disequilibrium in bothe the 238 U and 232 Th radioactive series. The high contents of radium isotopes with respect to the equilibrium values expected from the respective parents 232 Th/( 232 Th series) and 230 Th ( 238 U series) found in the spring water samples is the main evidence for the existence of significant radioactive disequilibrium in both the radioactive series.

Natural radioactivity of some spring and bottled mineral waters from several Central Balkan sites, as a way of their characterization