Matrix corrections for quantitative determination of trace elements in biological samples using energy‐dispersive X‐ray fluorescence spectrometry

Abstract

An experimental method for the evaluation of the matrix absorption correction (8) for the determination of trace elements in thick biological samples using EDXRF is discussed. The validity of the method was checked in two ways, first by comparing the experimental values with theoretical estimated values for samples of known matrix and second by analysing NBS biological standards in the form of thick pellets. It was found that a sample thickness of 40-70 mg is, in general, optimum for the analysis of biological samples in pellet form with an excitation energy of 22.6 keV.

Dielectric properties of europium–indium oxide solid solution films prepared on Si (100) substrates

“…The instrumental detection limit [14] of our system is about 800 ppm at an energy of 5.84 keV. The method of micro-radiographic analysis [15,16] using the tables in Ref. [17] for the mass absorption coefficients of Eu, In, and O were used in the determination of x.…”

Li (i = 1, 2, 3) sub‐shell fluorescence yields for 79Au, 80Hg and 81Tl

“…A value ofˇD 0.21 corresponds to 99% absorption. 20 The mass attenuation coefficients , used in evaluation ofˇ Lp , were taken from Chantler. 21 The energy of the inelastic scattered peak in the spectrum of Cu target was used to deduce the incident angles as 34 and 56°in the experimental arrangements for the secondary and direct excitation modes, respectively.…”

Investigation of a fossilized calotte from Lagoa Santa, Brazil, by EDXRF

“…The utilization of standards prepared in the laboratory with commercially available pure elements or compounds has been shown to be efficient for the determination of the elemental sensitivity in XRF systems because they are inexpensive and can be easily prepared. To correct for the absorption effects, 13,14 an Am-241 radioactive source (non-sealed) was used. The relationship between the mass absorption coefficient M of the matrix and the x-ray energy E for the different elements is given by 12…”