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Related Experiment Videos

A simplified method to create quantitative, "fixed" uranyl-contaminated metal coupons.

Catherine K McKeown1, Brian H Davison

  • 1Bioprocessing R&D Center, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6226, USA. xkn@ornl.gov

Health Physics
|April 8, 2004
PubMed
Summary

A new method safely creates uniform uranyl contamination on steel surfaces for testing decontamination. This allows precise measurement of radioactive contaminant removal efficiency.

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Area of Science:

  • Radiochemistry
  • Materials Science
  • Nuclear Safety

Background:

  • Developing reliable test surfaces is crucial for evaluating radioactive contaminant removal (decontamination) methods.
  • Quantitative assessment of decontamination efficacy requires consistent and reproducible contaminant application.

Purpose of the Study:

  • To develop and validate a safe and quantitative method for applying uranyl contamination onto steel surfaces.
  • To create standardized test coupons for assessing radioactive material removal techniques.

Main Methods:

  • A novel method was developed to uniformly apply uranyl contamination onto steel discs using a dike for controlled solution spreading.
  • The uranyl-loaded steel coupons were dried at temperatures below 100°C for enhanced laboratory safety.

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  • Alpha counting was performed using a Ludlum scanner for quantitative measurement of uranyl contamination levels.

    • Main Results:

    • The method achieved a depleted uranyl loading of approximately 0.1 mg U/cm² on 3.8-cm-diameter steel coupons.
    • Alpha radiation measurements demonstrated high precision (>97%) for individual coupons.
    • Replicate coupons showed a standard deviation of up to 9% in alpha concentration, indicating good reproducibility.

    Conclusions:

    • The developed method provides a safe, reproducible, and quantitative approach for creating uranyl-contaminated steel test surfaces.
    • This technique supports the accurate evaluation and validation of radioactive decontamination procedures.
    • The lower baking temperature enhances safety in standard radiological laboratory settings.