00000nam 2200000zi 4500 9.917209 CaOODSP 20251031142448 m o d f cr mn||||||||| 221110t20212021onca ob f000 0 eng d CaOODSP eng rda CaOODSP M183-2/8801E-PDF Knight, Ross David, 1956- author. Uranium, thorium, and potassium analyses using pXRF spectrometry / R.D. Knight, B.A. Kjarsgaard, E.G. Potter, and A. Plourde. [Ottawa] : Geological Survey of Canada, 2021. ©2021 1 online resource (23 pages) : colour illustrations + 2 sets of graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Open file, 2816-7155 ; 8801 Includes bibliographical references (pages 21-23). "The application of portable XRF spectrometry (pXRF) for determining concentrations of uranium (U), thorium (Th) and potassium (K) was evaluated using a combination of 12 Certified Reference Materials, 17 Standard Reference Materials, and 25 rock samples collected from areas of known U occurrences or mineralization. Samples were analysed by pXRF in Soil, Mining Cu/Zn and Mining Ta/Hf modes. Resulting pXRF data were compared to published recommended values, obtained by total or near total digestion methods with ICP-MS and ICP-OES analysis. Results for pXRF show a linear relationship, for thorium, potassium, and uranium (<5000 ppm U) as compared to the recommended concentrations. However, above 5000 ppm U, pXRF results show an exponential relationship with under reporting of pXRF concentrations compared to recommended values. Accuracy of the data can be improved by post-analysis correction using linear regression equations for potassium and thorium, and samples with <5000 ppm uranium; an exponential correction curve is required at >5000 ppm U. In addition, pXRF analyses of samples with high concentrations of uranium (e.g. >1 wt.% U) significantly over-estimated potassium contents as compared to the published values, indicating interference between the two elements not calibrated by the manufacturer software"--Abstract, page 1. Uranium Analysis. Thorium Analysis. Potassium Analysis. Rocks Analysis. Ores Sampling and estimation. X-ray spectroscopy. Uranium Analyse. Thorium Analyse. Potassium Analyse. Roches Analyse. Minerais Échantillonnage et estimation. Spectroscopie des rayons X. Geological Survey of Canada, issuing body. Open file (Geological Survey of Canada) 8801. (CaOODSP)9.506878 PDF 16.10 MB https://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8801-eng.pdf (report) PDF 718 KB https://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8801-1-eng.pdf (Research activity 1 graphs) PDF 522 KB https://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8801-2-eng.pdf (Research activity 2 graphs) HTML N/A https://doi.org/10.4095/328973 (complete dataset)