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Updated: Jun 3, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Rapid separation method for 237Np and Pu isotopes in large soil samples.

Sherrod L Maxwell1, Brian K Culligan, Gary W Noyes

  • 1Savannah River Nuclear Solutions, LLC, Aiken, SC 29808, USA. sherrod.maxwell@srs.gov

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|April 5, 2011
PubMed
Summary

A new method efficiently determines Neptunium-237 (237Np) and Plutonium (Pu) isotopes in large soil samples. This rapid analysis uses advanced precipitation and column separation techniques for accurate results.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Radiochemistry

Background:

  • Accurate determination of Neptunium-237 (237Np) and Plutonium (Pu) isotopes is crucial for environmental monitoring.
  • Existing methods for soil and sediment samples can be time-consuming and challenging for large sample matrices.

Purpose of the Study:

  • To develop and validate a rapid, efficient method for analyzing 237Np and Pu isotopes in large soil and sediment samples.
  • To improve upon existing analytical techniques by reducing processing time and enhancing interference removal.

Main Methods:

  • The method employs acid leaching followed by iron/titanium hydroxide precipitation for initial sample preparation.
  • A lanthanum fluoride precipitation step effectively removes the soil matrix, followed by rapid column separation using TEVA Resin.

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  • Utilizes vacuum box technology and rapid flow rates to expedite the analytical process.

    • Main Results:

    • The developed method demonstrates high chemical recoveries for 237Np and Pu isotopes.
    • Effective removal of interfering substances from the soil matrix was achieved.
    • Significant reduction in analytical time compared to conventional methods.

    Conclusions:

    • The new method provides a rapid and reliable approach for the determination of 237Np and Pu isotopes in large soil samples.
    • This technique offers high efficiency and accuracy, suitable for routine environmental monitoring and large-scale sample analysis.