Abstract：The binary ratio method could be used for the quantitative analysis of elements according to the logarithmic relationship between the spectral intensity ratio and concentration ratio of two elements. The binary ratio method was combined with the X-ray fluorescence spectrometry (XRF) for the quantitative analysis of uranium and zirconium content in uranium-zirconium system. The calibration curve showed good linearity whatever the absorption-enhancing effect was serious or not. The working parameters of instrument were optimized. The ULα line and ZrKα line were selected as the analytical lines. For the standard solution series of uranium and zirconium, the X-ray fluorescence counting rate of each working point was firstly measured. Then, the logarithm between the concentration ratio and signal ratio was calculated to prepare the binary ratio-calibration curve. The correlation coefficient (R2) of calibration curve was 0.999 7. The precision test was conducted using one uranium-zirconium system sample. The relative standard deviation (RSD) for uranium and zirconium was 0.035% and 0.048%, respectively. The proposed method was applied to the analysis of six batches of uranium-zirconium system samples. Meanwhile, the content of uranium and zirconium was also determined by titration method and direct XRF method, respectively. The found results were consistent. The self-prepared uranium-zirconium binary system sample solution was also analyzed, and the relative error between measured results and reference values was less than 3.00%. The proposed method could meet the determination requirements of uranium and zirconium content in uranium-zirconium system.
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