HIỆU CHỈNH HIỆU ỨNG MATRIX TRONG PHÂN TÍCH HUỲNH QUANG TIA X CHO MẪU Cr-Fe-Ni BẰNG THUẬT TOÁN CLAISSE-QUINTIN

Abstract

In this study, the Claisse – Quintin (C – Q) algorithm was applied to correct the matrix effects in X-ray fluorescence analysis for Cr-Fe-Ni samples. The X-ray fluorescence spectrometer used in this study includes a Si(Li) detector, ITRP preamplifier, DSA-LX digital multichannel analyzer, and ²⁴¹Am radioisotope sources. Experimental samples were prepared in a powder form with the same dimensions and density, but there was a change in the concentrations of the Cr, Fe, and Ni elements in the sample. The influence coefficients due to the absorption and enhancement effects between these elements were calculated based on the C – Q algorithm. Then, the concentrations of the Cr, Fe, and Ni elements in four different samples were determined. The results show that there is an agreement between the measured concentrations and control values with the maximum relative deviations of 3.0%; 3.8%; and 0.9% for the Cr, Fe, and Ni elements, respectively. Besides, a significant difference was observed between the results using the linear calibration method (without correcting the matrix effects) and the control values with the maximum relative deviations of 11, 4%; 31.7%; and 8.3% for the Cr, Fe, and Ni elements, respectively. The results show that the correction for the matrix effects is necessary in XRF analysis, and the C - Q algorithm could be applied for accurate analysis in the case of Cr-Fe-Ni samples.