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Updated: Jun 24, 2026

Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
Published on: May 20, 2019
Uranium isotopic ratio determination in urine using flow-injection ICP-MS: a tool for emergency monitoring
Maria Luiza D P Godoy1, Ligia M Q C Julião, José Marcus Godoy
1Instituto de Radioproteção e Dosimetria, Comissão Nacional de Energia Nuclear, Av. Salvador Allende s/n, CEP 22780-160 Rio de Janeiro, RJ, Brazil.
Abstract:
An inductively coupled plasma mass spectrometry-based method is presented aimed at total uranium concentration and atomic ratio determination. The method includes flow-injection uranium separation based on TRU Eichrom extraction chromatographic cartridges. The method was tested with urine interlaboratorial exercise samples and certified reference materials (NBL-CRM-U020A and NBL-CRM-U050) providing reliable results. The proposed methodology was also applied to urine samples obtained after an incident at a nuclear facility. The obtained (235)U/(238)U and (234)U/(238)U atomic ratios in the urine of an exposed worker were equal to those observed for an enriched uranium solution from the same origin.
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