γ-ray spectrometry investigation of radioactive equilibrium in ancient uranium ores of Ukraine

The nuclear-physics technique of determining the radioactive equilibrium. The degree of deviations from the radioactive equilibrium strongly correlates with the mineral content of ores. The possible models of loss/import of radioactive nuclides are investigated. As the more probable the complex model with the loss of 231Pa, 234U and 230Th and further secondary precipitation of 234U is examined. The geologically young ages of the losses of radionuclides were estimated to be equal to the times of the water level lifting for the periods of interglacial temperature optimums