METHOD OF EVALUATING VALUE OF RELATIVE ERROR OF EXPERIMENTALLY OBTAINED PERCENTAGE CONTENT OF ELEMENT TO CERTIFIED PERCENTAGE CONTENT OF SAID ELEMENT THROUGH X-RAY FLUORESCENCE ANALYSIS

摘要

FIELD: physics.;SUBSTANCE: invention can be used in X-ray fluorescence analysis. A set of samples of known chemical composition, including certified standard samples, is prepared, successively exposed and intensity of analytical lines is measured. An information array is formed from the measured values, with possibility of sorting the said array. From the intrinsic intensities of analytical fluorescence lines obtained from measurement when scanning standard samples and certified percentage content of elements, a graph of experimentally measured intensity of the analytical line versus the certified percentage content of elements is plotted in table numerical form. The information array is sorted in ascending order of the numerical value of the measured intensity of analytical fluorescence lines of the analysed element. A theoretical conversion coefficient is calculated for each value of measured intensity of analytical line. A data approximation cycle is carried out by introducing a practical conversion coefficient and correction coefficients of interelement effects into the information array. The said approximation cycle is repeated for each element contained in the samples, after which experimentally calculated concentration of the analysed element is obtained and the value of relative error of the experimentally obtained percentage content of the element to the certified percentage content of the element is obtained.;EFFECT: more accurate determination of relative error of content of an element.;3 cl, 1 tbl, 1 ex