Abstract
Abstract A radiometric method for the analysis of uranium and thorium ores is described. Three bands in the gamma spectra are selected. In the first one are counted gamma rays from 52 to 108 keV with a 1 3 4 ″ dia. × 1 4 ″ thick NaI(Tl) crystal. Gamma rays falling in the second (from 560 to 660 keV) and in the third (from 2.46 to 2.76 MeV) band are counted with a 3″ dia. × 3″ thick crystal. The method can be used for mixed uranium and thorium ores and still applies to uranium ores not in equilibrium. The method of least squares is applied to obtain the uranium and thorium concentrations, its errors and the disequilibrium factor. The calibration constants are determined with five standard samples.
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