Influence of the Experiment Energy Dispersive X-Ray Fluorescence Measurement of Uranium by Different Excitation Source
XIONG Chao1,2, GE Liang-quan1*, LIU Duan3, ZHANG Qing-xian1, GU Yi1, LUO Yao-yao1, ZHAO Jian-kun1
1. College of Nuclear Technology and Automation，Chengdu University of Technology，Chengdu 610059，China 2. Jiangxi Nuclear Industry Geological Bureau Testing Center，Nanchang 330002，China 3. The Radiation Environment Monitoring Station of Mianyang，Mianyang 621000，China
Abstract：Aiming at the self-excitation effect on the interference of measurements which exist in the process of Energy dispersive X-ray fluorescence method for uranium measurement. To solve the problem of radioactive isotopes only used as excitation source in determination of uranium. Utilizing the micro X-ray tube to test Self-excitation effect to get a comparison of the results obtained by three different uranium ore samples—109Cd，241Am and Mirco X-ray tube. The results showed that self-excitation effect produced the area measure of characteristic X-ray peak is less than 1% of active condition, also the interference of measurements can be negligible. Photoelectric effect cross-section excited by 109Cd is higher, corresponding fluorescence yield is higher than excited by 241Am as well due to characteristics X-ray energy of 109Cd, 22.11 & 24.95 KeV adjacent to absorption edge energy of Lα, 21.75 KeV, based on the above, excitation efficiency by 109Cd is higher than 241Am; The fact that measurement error excited by 241Am is significantly greater than by 109Cd is mainly due to peak region overlap between L energy peaks of uranium and Scattering peak of 241Am, 26.35 keV, These factors above caused the background of measured Spectrum higher; The error between the uranium content in ore samples which the X-ray tube as the excitation source and the chemical analysis results is within 10%. Conclusion: This paper come to the conclusion that the technical quality of uranium measurement used X-ray tube as excitation source is superior to that in radioactive source excitation mode.
熊 超1,2，葛良全1*，刘 端3，张庆贤1，谷 懿1，罗耀耀1，赵剑锟1 . 不同激发方式对能量色散X射线荧光法测铀的影响 [J]. 光谱学与光谱分析, 2016, 36(03): 838-841.
XIONG Chao1,2, GE Liang-quan1*, LIU Duan3, ZHANG Qing-xian1, GU Yi1, LUO Yao-yao1, ZHAO Jian-kun1 . Influence of the Experiment Energy Dispersive X-Ray Fluorescence Measurement of Uranium by Different Excitation Source. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(03): 838-841.
