A new approach to the study and control of interelement effects in the X‐ray fluorescence analysis of metal alloys and other multi‐component systems

Abstract

Accurate fluorescent intensities of a number of binary and ternary alloys have been calculated by relying on the classical expressions of primary and secondary fluorescence and assuming standard spectral intensity distributions for the primary radiation. It could then be shown that under polychromatic excitation the enhancement effect on the one hand, and on the other hand, the absorption effect with the complications (drift of equivalent wavelength) related to polychromatic radiation, became very much alike on practical terms, apart from generally opposed signs. Both effects could then be dealt with in a homogeneous way and a simple method was derived using (K − 1) coefficients ‐ see definition in the text ‐ which are fixed from a careful study of binary compositions. Moreover, making provision for fluorescence ‘crossed effects’, the principle of a general and accurate procedure was then established to the end of computerized non‐destructive analysis. The name of ‘generalized iteration method’ is proposed for this procedure.

Qualitative Analyses of Coins by Using a Si(Li) Detector and An Xrf‐Exciter System

“…This is surprising because in general it is supposed that a memorial coin should be more valuable. The compositions of the three shown in Fig. 8,9,11 seem to be very similar as they should be. The five dollar coin (Fig.…”

“…The Ni content in the memorial coin (Fig. 12) is also lower than those coins shown in Fig. 8,9,11. This is surprising because in general it is supposed that a memorial coin should be more valuable.…”

A new fundamental parameter based calibration procedure for micro X-ray fluorescence spectrometers

“…The idea of using the mean value theorem to substitute the energy integral by an expression for monochromatic excitation is known from the concept of equivalent or effective wavelength, which was used to calculate influence coefficients for polychromatic excitation (see, e.g., [18]). For the application intended in this work it is necessary to determine the mean value of the integral for every measured line i, so that following equation is satisfied:…”

The Claisse–Quintin and Lachance–Claisse alpha correction algorithms and their modifications. A critical examination

“…As for the enhancement effect, a fundamental equation was derived by Tertian and ViC le Sage,22 which can be written where all (primary fluorescence) is the constant in Eqn (19) and eV is given by and behaves as a considerably variable parameter (see Ref. 9 or Ref 14, section 5.3.).…”