Heterogeneity Effects in X-Ray Analysis*
- 1 January 1961
- journal article
- Published by Cambridge University Press (CUP) in Advances in X-ray Analysis
- Vol. 5, 335-354
- https://doi.org/10.1154/s0376030800001671
Abstract
A fundamental quantitative treatment of the heterogeneity effects in X-ray fluorescence has been made. The theory predicts that the grain-size effect appears only in a limited region of grain sizes which depends on the wavelength of the primary radiation and the nature of the compounds in the mixture. With monochromatic radiation, the fluorescence intensity showed increase or decrease by a factor of a few units as grain size is decreased, A factor as large as 12, the theoretical value, has been observed in one particular experiment. Usually the grain-size effect can be eliminated by intensive grinding. For the light elements fine grinding is disastrous if long wavelengths are used. By an appropriate choice of the wavelength it is possible to eliminate the effect even without grinding. The mathematical treatment also predicts, but less rigorously, a grain-size effect in X-ray diffraction.The effect on the fluorescence intensities by changes in the chemical composition of the grains that contain the fluorescent element is predicted by the theory.These findings are discussed in relation to the analysis of elements when polychromatic beams are used.Keywords
This publication has 6 references indexed in Scilit:
- Effects Due to Chemical State of Samples in X-Ray Emission and AbsorptionAnalytical Chemistry, 1960
- Determination of Calcium in Wolframite Concentrates by Fluorescent X-Ray SpectrographyPublished by Springer Nature ,1960
- Crystal Chemical Studies by X-ray FluorescencePublished by Springer Nature ,1960
- Determination of Uranium in Flotation Concentrates and in Leach Liquors by X-ray FluorescencePublished by Springer Nature ,1960
- X-Ray Spectrophotographic Determination of Tantalum, Niobium, Iron, and Titanium Oxide Mixtures. Using Simple Arithmetic Corrections for Interelement EffectsAnalytical Chemistry, 1958
- X-Ray Spectroscopic Determination of Columbium and Tantalum in Rare-Earth OresApplied Spectroscopy, 1954