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Influence of sample thickness, excitation energy and geometry on particle size effects in XRF
Author(s) -
Van Dyck P.,
Markowicz A.,
Van Grieken R.
Publication year - 1985
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300140409
Subject(s) - excitation , particle size , particle (ecology) , matrix (chemical analysis) , plane (geometry) , radiation , geometry , materials science , computational physics , optics , physics , chemistry , mathematics , oceanography , quantum mechanics , composite material , geology
Expressions are presented for calculating the matrix effect and the pure particle size effect in the XRF analysis of particulate samples with a discrete particle size. The equations are based on the absorption‐weighted radiometric diameter concept. Two excitation–detection geometries are considered, with the angles between the sample plane and both the incident and emerging radiation being either 90° (π geometry) or 45° (π/2 geometry). Calculations were made for different sample loadings and exciting radiation energies. The influence of these parameters on the matrix and pure particle size effects is shown. From the results, it is possible to predict the performances of alternative experimental correction procedures for the particle size effect, involving dual measurements at different excitation energies or in different excitation–detection geometries.