Study On The Accuracy Relationship Between The Light Source And Quantitative Analysis In EDXRF Analysis

As a chemical analysis method,EDXRF analysis technology is widely used in geological survey,heavy metal element analysis,industrial non-destructive component analysis and many other fields.In recent years,with the development of the computer,photoelectron detection and information processing technology,EDXRF analysis methods are developing toward the direction of trace analysis,and the scope of application is expanding.In order to improve the accuracy of EDXRF detection system and the detect of target elements,it's important to reduce the influence of X-ray source and fluorescent rays in the system.Thus we can raise the signal-to-noise,increase the detection probability of fluorescent rays to achieve the performance of the system optimization.(The EDXRF system is a spectrometer designed and implemented in our laboratory.)In this paper,we research the relationship between EDXRF light source(Non-specific X-ray tube,but generally refers to the sum of light source structure on X-rays and its associate light source in the system,such as X-ray tube electrical parameters,X-ray tube target elements,source X-ray collimator structure,light source structure location.)and quantitative analysis accuracy.Using simulation analysis to optimize structure parameters of light source and improve detection accuracy of the target element characteristic X-ray.The result shows that X-ray source material can influence the output efficiency of the target element.The source X-ray collimator can correct the cross-sectional topography of the X-ray interaction with the material,but at the same time the limit absorption of the collimator on the X-ray makes the target element characteristic ray intensity lower,and there is an optimal value between the structural parameters and the fluorescence intensity of the target element.The emission cross-section of the target element characteristic ray can affect the receiving probability fluorescent photon by detector.The EDXRF system structure is optimized using the simulation results,and the analysis software is designed and analyzed according to the quantitative analysis algorithm.After the calibration,the samples are tested and compared.Comparing with the original system,the stability and repeatability of the system are more accuracy after optimization,at the same time,the background noise of the spectrum is reduced.Although the total count rate is reduced due to the collimator's absorption of source X-rays,the overall system performance is improved.