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Quality Assessment Statistic Evaluation of X-Ray Fluorescence via NIST and IAEA Standard Reference Materials

World Journal of Nuclear Science and Technology 2017年第2期7卷 121-128页

作者： O. M. H. Ahmed Farouk I. Habbani A. M. Mustafa E. M. A. Mohamed A. M. Salih ftihia seedig Chemistry and Nuclear Physics Institute Sudan Atomic Energy Commission Khartoum Sudan College of Nuclear Science and Technology Harbin Engineering University Harbin China Department of Physics Faculty of Science University of Khartoum Khartoum Sudan Council of Atomic Energy Sudan Academy of Sciences Khartoum Sudan

The aim of this study is a quality assessment of X-ray fluorescence laboratory located at the University of Khartoum. The X-ray fluorescence spectrometer system consists, a set of three 109Cd sources of an initial nominal activity of 10 μCi, and Si(Li) detector Energy Dispersive XRF(EDXRF) systems. It is important to carry out this work because it has an effective contribution for a wide range of research and services. The assessment was carried out by measuring 8 NIST-2709a (soil) and 13 IAEA-155 (milk powder) standard reference material samples for repeatability examinations to test the measurement precision. The total combined standards uncertainty values for XRF lab were estimated by an error from repeatability measurements adding 2.6% for error propagation related to the method. For accuracy assessment, three standard statistic approaches were applied, i.e. the Bias %, zeta-score, and En-number. The bias of all elements for both standard materials was found to be within a deviation range from −28% to 7.8%. The results of all elements for both the zeta-score test and En-number have satisfactory results except Th (Thorium) and Zr (Zirconium) which consider as questionable results for NIST SRM 2709a and unsatisfactory results for En-number.

关键词： XRF QC Reference Material Statistic Evaluation

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