کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1240097 | 969104 | 2011 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A new fundamental parameter based calibration procedure for micro X-ray fluorescence spectrometers A new fundamental parameter based calibration procedure for micro X-ray fluorescence spectrometers](/preview/png/1240097.png)
Fundamental parameter based quantification of X-ray fluorescence (XRF) measurement data requires an accurate knowledge of the spectrometer parameters, including the spectral distribution of the excitation radiation. In case of micro-XRF where a polycapillary optic is utilized in the excitation channel this distribution is changed due to the transmission properties of the lens. A new calibration procedure, based on fluorescence data of thin standard samples, was developed to determine the excitation spectrum, i.e., the product of the X-ray tube spectrum and the transmission of the used X-ray optic of a micro-XRF setup. The calibration result was validated by the quantitative analyses of certified multi-element reference standards and shows uncertainties in the order of 2% for main components, 10% for minor elements and 25% for trace elements. The influence of secondary order effects like Coster–Kronig transitions and cascade effects is analyzed and the accuracy of fundamental parameters in common databases is discussed.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 66, Issue 2, February 2011, Pages 170–178