Particle Size Effects in Radioisotope X-Ray Spectrometry

Berry, P.F.; Furuta, T.; Rhodes, J.R.

doi:10.1154/s0376030800006029

Cited by 23 publications

(14 citation statements)

References 6 publications

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“…Samples were grinded in the disc mill with the discs spaced 0.05 mm apart and prepared as pressed pellets on the boric acid substrate. Particle size effect almost does not influence the ratios values, but accurate determination of total sulfur is necessary to correctly determine sulfate sulfur. Therefore, all samples should possibly have close size of powder particles.…”

Section: Resultsmentioning

confidence: 99%

X‐ray fluorescence determination of sulfur chemical state in sulfide ores

2016

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This paper describes the X-ray fluorescence technique for estimation of the ratio between sulfide and total sulfur in sulfide ores using the influence of sulfur chemical state on positions and intensities of lines (SKα 1,2 , SKβ 1,3 ) and satellites (SKβ′, SKα 3,4 ) of the sulfur X-ray emission spectra measured by the wavelength-dispersive X-ray fluorescence spectrometer. The samples to be analyzed were prepared as pressed powder pellets on boric acid substrate. The SKα 1,2 line chemical shift is the most appropriate parameter for sulfur chemical state estimation because spectral lines in this field are intensive and are almost not affected by spectral overlap of lead spectrum lines. The ratios of line intensities were also used as analytical parameters. Forty-one samples of sulfide ores collected in the Russian Far East and Southern Ural deposits have been analyzed. The results of estimation of sulfur chemical state by gravimetric and proposed X-ray fluorescence techniques agree fairly well.

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Section: Resultsmentioning

confidence: 99%

X‐ray fluorescence determination of sulfur chemical state in sulfide ores

2016

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“…Particle size effect is determined by the absorption factor exp(− μ f ρd ), where μ f is mass attenuation coefficient of the X‐ray fluorescence radiation, ρ is the particle density, and d is the average particle size. For the Rb, Sr, and Pb analytical lines, the coefficients μ f are within the range from 9 to 22 cm 2 g −1 , and the value of ( μ f ρd ) is less than 0.1, so the variation in the particle size does not affect the X‐ray fluorescence intensity.…”

Section: Methodsmentioning

confidence: 99%

Determination of Rb, Sr, Cs, Ba, and Pb in K‐feldspars in small sample amounts by total reflection X‐ray fluorescence

et al. 2013

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The results of the determination of Rb, Sr, Cs, Ba, and Pb in K-feldspars by total reflection X-ray fluorescence analysis using 0.05 g sample in mass are presented. Prepared suspensions of the rock Certified Reference Materials and the K-feldspar samples were chosen as the sample preparation method. Studying the particle sizes of the K-feldspar sample powders was carried out. The concentrations of the elements were evaluated using the internal standard method. As internal standard, either a Se solution was added to the sample or the concentration of Rb was preliminary determined or known, have been used. The accuracy of the element determinations was estimated by comparison between obtained and certified values of the elements determined in the Certified Reference Materials of the K-feldspars, such as JF-1 and JF-2.

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“…Peat is a mixture of mineral particles and organic matter. The mixture is heterogeneous for X‐ray absorption and fluorescence due to the distribution of elements in minerals with different contents (mineralogical effect) and the different particle size of minerals 14–23 . XRF analysis of powder peat samples is problematic due to variations in the mineral composition, high organic matter content (up to 90 wt%), particle size distribution, as well as the lack of matrix‐matched reference materials with a certified content of the rock‐forming elements.…”

Section: Introductionmentioning

confidence: 99%

Features of X‐ray fluorescence determination of rock‐forming elements in powder samples of peat sediments

2021

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The features of rock‐forming elements determination in powder samples of peat sediments are considered. Based on theoretical calculations and experimental data, the mineralogical and particle size effects on the X‐ray fluorescence intensity have been estimated. For routine analysis, powder rock samples are usually milled to a particle size of 10–60 μm. Theoretically, estimated variations of rock‐forming elements analytical lines intensities in different minerals are up to 30%, and the particle size effect cannot be eliminated simultaneously for all rock‐forming elements. Experimental estimation shows that the impossibility of the particle size distribution control can lead to significant variations in the intensities of the analytical lines (3%–18%) that is mainly corresponding to theoretical estimation. Fine milling allowed us to achieve an average particle size of fewer than 20 μm and reduce the measurement uncertainty by 1.5–2 times. 12 samples of peat sediments with organic matter content up to 70 wt% were analyzed by X‐ray fluorescence analysis using different sample preparation techniques, as well as by certified methods. The accuracy of X‐ray fluorescence analysis of peat sediments prepared as pressed pellets varies from 1.5 to 11 rel% depending on compound contents. It is more than for samples prepared as fused beads, however, the proposed method can be used to determine the variations of rock‐forming elements contents in peat sediments where the content variations exceed the measurement uncertainty, and accuracy of analysis is sufficient for further paleoecological reconstructions.

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Particle Size Effects in Radioisotope X-Ray Spectrometry

Cited by 23 publications

References 6 publications

X‐ray fluorescence determination of sulfur chemical state in sulfide ores

X‐ray fluorescence determination of sulfur chemical state in sulfide ores

Determination of Rb, Sr, Cs, Ba, and Pb in K‐feldspars in small sample amounts by total reflection X‐ray fluorescence

Features of X‐ray fluorescence determination of rock‐forming elements in powder samples of peat sediments

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