FLUORESCENT X-RAY-ANALYSIS OF URANIUM USING INTERNAL STANDARD AND FILTER METHODS

Abstract
Interna1 standard and filter methods for fluorescent X-ray analysis of uranium in ores are investigated. In the first method, successful application of strontium K-X internal standard line for uranium L-X analyte line is carried out. Standardization with strontium eliminated the absorption-enhancement effect in analysis. In the second method, strontium and thorium are chosen as filters for uranium L-X and K-X fluorescent rays respectively. Attenuation (Hull) filters are used to remove UL_β, UK_β and primary beam lines from spectra in order to prevent interference with the analyte line. With higher intrinsic X-ray production yields K and L lines analysis can be performed on thick and thin targets. The concentration of uranium in ores obtained by two methods agrees well with the reference value.