Abstract
Quantitative and isotopic measurement of actinide elements is required in many circumstances in the nuclear industry. For example, determination of very low levels of these alpha emitters in human urine samples is used to assess the internal committed dose for nuclear workers. Quantifying actinide isotopes in radioactive waste from nuclear processing and nuclear facility decommissioning provides important information for waste management. Accurate determination of the uranium isotopic ratios in reactor fuels provides fuel burnup information. Inductively coupled plasma mass spectrometry (ICP-MS) has been used for the determination of Th, U, and Pu in various samples including urine, nuclear waste, and nuclear fuel in our laboratory. In order to maximize the capability of the technique and ensure quality analyses, ICP-MS was used to analyze samples directly, or after pre-treatment to separate complicated matrices or to concentrate the analyte(s). High-efficiency sample introduction techniques were investigated. Spectral interferences to minor isotopes caused by peak tails and hydride ions of major actinide isotopes were studied in detail using solutions prepared with light and heavy waters. The quality of the isotopic ratio measurement was monitored using standard reference materials.
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Acknowledgments
The authors wish to thank T. Shultz (Analytical Chemistry Branch, AECL) for providing the results of uranium isotopes analyzed by TIMS and the dissolved reactor fuel samples. We would like to thank X. Dai, S. Kramer-Tremblay and J. Moore (Dosimetry Services, AECL) for the urine sample preparation. We also would like to think R. Rao and L. Zhou (Analytical Chemistry Branch, AECL) for preparing nuclear waste samples.
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Shi, Y., Collins, R. & Broome, C. Determination of uranium, thorium and plutonium isotopes by ICP-MS. J Radioanal Nucl Chem 296, 509–515 (2013). https://doi.org/10.1007/s10967-012-2128-9
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DOI: https://doi.org/10.1007/s10967-012-2128-9