Abstract：Erbium is usually used as burnable poison in nuclear reactor. The content of erbium in this type of burnable poison should be accurately determined in production process. In other words, it is necessary to measure the content of erbium in erbium nitrate solution. The analysis method of erbium in erbium nitrate solution by Xray fluorescence spectrometry (XRF) was established. The results showed that the peak shape of erbium in angle scanning was relatively complete when LiF200 crystal was selected. The peaktobackground ratio of erbium was best when 150 μmcollimator was used. In addition, the overall performance and count rate of instrument were good when the power was 40 kV×40 mA. The mass concentration of erbium in range of 115 mg/mL was linear to the strength of characteristic line ErLα. The correlation coefficient of calibration curve was 0.993 6. The erbium nitrate standard solution and actual erbium nitrate sample were determined according to the experimental method. The found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICPAES). The relative standard deviations (RSD, n=6) were less than 0.7%.
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