Rare earth elements in uranium ore deposits from Namibia: A nuclear forensics tool

Madzunya, Dakalo; Uushona, Vera; Mathuthu, Manny; Heike, Wanke

Abstract

Rare earth elements (REE) concentrations and pattern remains largely unchanged during the process of milling and can thus provide strong evidence of the origin of the material. The aim of this study was to determine the rare earth elements in uranium ore deposits as a nuclear forensics tool. Uranium ore from three mines were collected and analyzed using an inductively coupled plasma mass spectrometry (ICP-MS) to determine the concentrations of rare earth elements. A non-parametric Kruskal-Wallis test and a pair wise comparison test was used to test for significant difference in the concentration of REEs between the mines followed by principal component analysis (PCA). The REE concentration were normalized with C1-Chondrite values to determine the REE pattern. The total concentration of the REE ranged from 131.38 to 161.77 ppb, 266.27 to 840.37 ppb, 177.86 to231.51 for Mine 1, 2 and 3, respectively. The mean ∑REE obtained was in the order M2>M3>M1. The pairwise comparison test of the pair M1 and M2 was found to be less than 0.05, indicating a significant difference in the samples. The REE pattern is mostly similar for all the ore samples with pronounce Eu anomaly, enriched LREE and depleted flat HREE. The PCA results indicates that the ore samples can be distinguished from each other.

• Journal Article Type: Article
• Acceptance Date: May 19, 2021
• Online Publication Date: Jun 8, 2021
• Publication Date: Oct 1, 2021
• Deposit Date: Jun 9, 2021
• Publicly Available Date: Jun 10, 2021
• Journal: Journal of Environmental Radioactivity
• Print ISSN: 0265-931X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 237
• Article Number: 106668
• DOI: https://doi.org/10.1016/j.jenvrad.2021.106668
• Keywords: Waste Management and Disposal; Pollution; Health, Toxicology and Mutagenesis; Environmental Chemistry; General Medicine
• Public URL: https://uwe-repository.worktribe.com/output/7451777