Effects of X-ray absorption in the analysis of thick target samples by XRF |
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Authors: | G. B. Baptista E. C. Montenegro C. V. Barros Leite A. S. Paschoa |
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Affiliation: | (1) Departamento de Física, Pontifícia Universidade Católica, Cx. P. 38071, 22453 Rio de Janeiro, RJ, Brasil |
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Abstract: | The accuracy of the quantitative analysis of thick targets by XRF is impaired by effects due to the absorption of X-rays in the matrix associated with the non-uniformity of the X-ray beam and the lack of knowledge of the actual distribution of trace elements in the target. The uncertainty in the elemental mass associated to a definite number X-rays detected is discussed in the paper. A correction factor is derived to account specifically for the effect of the absorption of X-rays and the non-uniformity of the X-ray beam. Work partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico, Financiadora de Estudos e Projetos and International Atomic Energy Agency. |
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