Quality Assessment Statistic Evaluation of X-Ray Fluorescence via NIST and IAEA Standard Reference Materials
Open Access
- 1 January 2017
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in World Journal of Nuclear Science and Technology
- Vol. 07 (02), 121-128
- https://doi.org/10.4236/wjnst.2017.72010
Abstract
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.Keywords
This publication has 6 references indexed in Scilit:
- k 0-INAA of biological matrices at IPEN neutron activation analysis laboratory, São Paulo, using the k0_IAEA softwareJournal of Radioanalytical and Nuclear Chemistry, 2014
- k0-INAA quality assessment by analysis of soil reference material GBW07401 using the comparator and neutron flux monitor approachesApplied Radiation and Isotopes, 2011
- Rapid elemental analysis of sediment samples by isotope source XRFJournal of Paleolimnology, 2000
- Application of X-ray fluorescence spectrometry in assessment of environmental pollutionJournal of Radioanalytical and Nuclear Chemistry, 1996
- X-Ray fluorescence analysis utilizing the fundamental parameter method for the determination of the elemental composition in plant samplesAnalytica Chimica Acta, 1995
- Guidelines for evaluating and expressing the uncertainty of NIST measurement resultsPublished by National Institute of Standards and Technology (NIST) ,1994