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Related Experiment Videos

Technegas and Pertechnegas particle size distribution

J J Lloyd1, R A Shields, C J Taylor

  • 1Department of Medical Physics, Manchester Royal Infirmary, UK.

European Journal of Nuclear Medicine
|May 1, 1995
PubMed
Summary
This summary is machine-generated.

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Technegas and Pertechnegas radioactive aerosols, used in lung scintigraphy, have particle sizes around 158 nm. Production variations slightly affect size but lung deposition remains largely unchanged.

Area of Science:

  • Nuclear Medicine
  • Medical Imaging
  • Particle Physics

Background:

  • Technegas and Pertechnegas are radioactive aerosols crucial for lung scintigraphy.
  • Their production involves evaporating technetium-99m eluate and heating to 2500°C.
  • Understanding particle size is key to predicting lung deposition patterns.

Purpose of the Study:

  • To measure the particle size distributions of Technegas and Pertechnegas.
  • To correlate particle size with regional lung deposition.
  • To investigate how routine production variations influence aerosol particle size.

Main Methods:

  • Activity size distributions were measured using a serial wire-screen diffusion battery.
  • Factors like "simmer" cycles and time post-generation were varied.

Related Experiment Videos

  • Particle size distributions were analyzed for log-normal characteristics.

    • Main Results:

    • Technegas exhibited a log-normal size distribution with a median diameter of 158 nm (geometric standard deviation 1.5).
    • Pertechnegas showed similar size characteristics.
    • Median particle size increased with the number of "simmer" stages and time after generation, likely due to increased crucible salt content.

    Conclusions:

    • The measured particle sizes predict significant deposition in the alveolar region (37%) and bronchial region (5%).
    • Routine production variations within the tested range are unlikely to cause significant changes in lung deposition.
    • Particle size characterization is vital for optimizing aerosol delivery in lung imaging.