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Rapid determination of 237Np and Pu isotopes in water by inductively-coupled plasma mass spectrometry and alpha spectrometry

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Abstract

A new method that allows rapid preconcentration and separation of plutonium and neptunium in water samples was developed for the measurement of 237Np and Pu isotopes by inductively-coupled plasma mass spectrometry (ICP-MS) and alpha spectrometry. 238U can interfere with 239Pu measurement by ICP-MS as 238UH+ mass overlap and 237Np via peak tailing. The method provide enhanced removal of uranium by separating Pu and Np initially on TEVA Resin, then moving Pu to DGA resin for additional removal of uranium. The decontamination factor for uranium from Pu is almost 100,000 and the decontamination factor for U from Np is greater than 10,000. This method uses stacked extraction chromatography cartridges and vacuum box technology to facilitate rapid separations. Preconcentration is performed using a streamlined calcium phosphate precipitation method. Purified solutions are split between ICP-MS and alpha spectrometry so that long and short-lived Pu isotopes can be measured successfully. The method allows for simultaneous extraction of 20 samples (including QC samples) in 4–6 h, and can also be used for emergency response. 239Pu, 242Pu and 237Np were measured by ICP-MS, while 236Pu, 238Pu, and 239Pu were measured by alpha spectrometry.

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Acknowledgments

This work was performed under the auspices of the Department of Energy, DOE Contract No. DE-AC09-96SR18500. The authors wish to acknowledge Rebecca Chavous and Monica Miller for their assistance with this work.

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Authors and Affiliations

  1. Savannah River Nuclear Solutions, LLC, Building 735-B, Aiken, SC, 29808, USA

    Sherrod L. Maxwell, Brian A. Culligan, Vernon D. Jones, Sheldon T. Nichols & Gary W. Noyes

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  1. Sherrod L. Maxwell
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  2. Brian A. Culligan
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  3. Vernon D. Jones
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  4. Sheldon T. Nichols
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  5. Gary W. Noyes
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Correspondence to Sherrod L. Maxwell.

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Maxwell, S.L., Culligan, B.A., Jones, V.D. et al. Rapid determination of 237Np and Pu isotopes in water by inductively-coupled plasma mass spectrometry and alpha spectrometry. J Radioanal Nucl Chem 287, 223–230 (2011). https://doi.org/10.1007/s10967-010-0825-9

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  • DOI: https://doi.org/10.1007/s10967-010-0825-9

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