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ULTRAFINE AEROSOL INFLUENCE ON THE SAMPLING BY CASCADE IMPACTOR.

M Vasyanovich1,2, M Y A Mostafa1,3, M Zhukovsky1,2

  • 1Ural Federal University, Ekaterinburg, Russia.

Radiation Protection Dosimetry
|October 17, 2017
PubMed
Summary

Ultrafine radioactive aerosols (1-5 nm) can distort cascade impactor measurements due to diffusion. Adding mesh screens or a diffusion battery before sampling minimizes this diffusion deposition effect.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Nuclear Engineering

Background:

  • Cascade impactors are standard for radioactive aerosol size distribution.
  • Ultrafine aerosols (1-5 nm) pose challenges for traditional inertial deposition methods.
  • Diffusion deposition becomes significant for these ultrafine particles.

Purpose of the Study:

  • To investigate the impact of ultrafine aerosols on cascade impactor performance.
  • To evaluate the distortion caused by diffusion deposition in cascade impactors.
  • To identify methods for mitigating diffusion effects on ultrafine aerosol sampling.

Main Methods:

  • Studied the response of three distinct cascade impactor types.
  • Analyzed the influence of ultrafine aerosols (1-5 nm) on impactor measurements.

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  • Assessed the effectiveness of pre-sampling modifications.

    • Main Results:

    • Diffusion deposition of ultrafine aerosols significantly distorts cascade impactor readings.
    • The extent of distortion varies depending on impactor design.
    • Mesh screens and diffusion batteries effectively reduce diffusion deposition.

    Conclusions:

    • Standard cascade impactors may provide inaccurate size distributions for ultrafine radioactive aerosols.
    • Diffusion deposition is a critical factor to consider when sampling ultrafine aerosols.
    • Pre-installation of diffusion control devices is recommended for accurate ultrafine aerosol characterization.