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A modified approach to the quantitative XRF analysis of thick targets
Author(s) -
Orlić I.,
Tomić S.,
Makjanić J.,
Jakšić M.,
Valković V.
Publication year - 1987
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.1300160307
Subject(s) - attenuation , collimator , formalism (music) , attenuation coefficient , penetration depth , computational physics , optics , matrix (chemical analysis) , physics , mathematics , analytical chemistry (journal) , geometry , chemistry , chromatography , art , musical , visual arts
The widely used formalism for quantitative XRF analysis based on the correction of characteristic line intensity for absorption effects is shown to be inadequate when thick samples with low total mass attenuation coefficients are analysed (biological samples, solutions, etc.). The geometry factor is not a constant function of the collimator's shape and dimensions, but it is found that in an analysed matrix it depends on the line energy and penetration depth. An experimental and a theoretical model for the determination of the geometrical correction are proposed and tested on a set of samples. The concentrations obtained are in excellent agreement with the values expected, whereas the model based on the correction of intensities only for absorption effects gives an error of at least 25% for thick samples.