Application of selected fundamental parameters in x-ray fluorescence analysis

The effectiveness of selected fundamental parameters in x-ray fluorescence analysis previously proposed by the authors was examined with a few examples. Some synthetic fused binary disks were prepared and measured to obtain the measured binary coefficients. The theoretical influence coefficients were also calculated based on the synthetic specimens and measuring conditions using those selected fundamental parameters and compared with the measured values. It was found that the theoretical influence coefficients calculated with selected fundamental parameters agreed better with measured values than those calculated with original parameters. The synthetic fused disks, some Au-Ag-Cu alloys and some Chinese rock reference materials were measured and quantitatively calculated with the program NRLXRF, that uses original parameters, and with NRL301, that uses selected fundamental parameters, using only one calibration standard for fused disks and only pure elements for alloys. The relative errors of the results from NRL301 are much smaller than those from NRLXRF. Data for the example of pressed powders of cement published in an NBS Technical Note were also calculated with NRL301 with one calibration standard. The results are comparable to those from NBSGSC obtained with seven calibration standards. Copyright (C) 2003 John Wiley Sons, Ltd.