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Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
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A new wiping device for detecting removable contamination.

Etsuko Furuta1, Yasuo Watanabe, Shigeaki Yokota

  • 1Ochanomizu University, Graduate School of Humanities and Sciences, Bunkyo-ku, Tokyo, Japan. furuta.etsuko@ocha.ac.jp

Health Physics
|May 3, 2012
PubMed
Summary

A novel plastic scintillator (PS) roller device offers improved detection of removable contamination. This method enhances radioisotope identification and reduces environmental impact compared to traditional wiping techniques.

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Area of Science:

  • Nuclear Detection and Measurement
  • Radiation Safety and Monitoring

Background:

  • Traditional methods for detecting removable contamination often involve manual wiping, which can have limitations in efficiency and variability.
  • Existing techniques may struggle to differentiate between radioisotopes with similar energy spectra.
  • Environmental concerns associated with the use of liquid scintillators in detection processes necessitate alternative approaches.

Purpose of the Study:

  • To develop and evaluate a new wiping device utilizing a plastic scintillator (PS) roller for detecting removable contamination.
  • To assess the performance of the PS method in terms of wiping efficiency, variability, and radioisotope identification capabilities.
  • To determine the environmental benefits of the PS method compared to conventional liquid scintillation counting.

Main Methods:

  • A cylindrical plastic scintillator (PS) roller was developed, onto which a wiping material (NUC-Wipe™ or Double Stick Tape™) was applied.
  • The roller device was used to wipe contaminated surfaces, and the PS was subsequently removed and measured in a liquid scintillation counter (LSC) without scintillation cocktail.
  • Wiping efficiencies for different isotopes (e.g., H, C) and the ability to differentiate between nuclides with close maximum beta ray energies (Emax) (e.g., C and S) were evaluated.

Main Results:

  • The PS method demonstrated wiping efficiencies of approximately 15% for H and 40% for C when using NUC-Wipe™.
  • The variability in contamination detection was lower compared to hand wiping.
  • The PS method successfully identified contaminated radioisotopes by analyzing their spectra, even for nuclides with very close Emax values (e.g., C and S).
  • The method proved environmentally friendly by eliminating the need for liquid scintillation cocktail, significantly shortening post-processing time.

Conclusions:

  • The developed plastic scintillator roller device provides a viable and improved method for detecting removable contamination.
  • The PS method offers enhanced radioisotope identification capabilities and reduced measurement variability.
  • This approach presents a more environmentally friendly alternative to traditional wiping and liquid scintillation techniques.