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Related Experiment Videos

Emanation coefficients for Rn in sized coal fly ash.

D R Kalkwarf, P O Jackson, J C Kutt

    Health Physics
    |April 1, 1985
    PubMed
    Summary

    Emanation coefficients for radon-222 (Rn) in coal fly ash were measured. Smaller particles and certain coal sources showed higher Rn escape, impacting potential inhalation risks.

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    Area of Science:

    • Environmental Science
    • Radiochemistry
    • Geochemistry

    Background:

    • Coal fly ash is a byproduct of coal combustion.
    • Radon-222 (Rn) is a naturally occurring radioactive gas.
    • Fly ash can contain radioactive elements, including those that decay to Rn.

    Purpose of the Study:

    • To evaluate radon-222 emanation coefficients in sized coal fly ash samples.
    • To determine the influence of fly ash source and particle size on Rn emanation.
    • To assess the potential for Rn release from inhaled fly ash particles.

    Main Methods:

    • Utilized a modified "sealed-can, gamma-only" technique.
    • Separated diffusible and nondiffusible Rn using charcoal adsorption.
    • Measured Rn and its daughter 214Bi via gamma-ray spectrometry.

    Main Results:

    • Emanation coefficients for Rn in fly ash ranged from 0.007 to 0.098.
    • Values were dependent on fly ash source and particle size.
    • Emanation coefficients and specific activities generally decreased with increasing particle size.

    Conclusions:

    • A small fraction of Rn in lung-deposited fly ash is expected to be removed by exhalation.
    • Fly ash particle size and source are critical factors in Rn release.
    • Understanding Rn emanation is important for assessing inhalation risks from fly ash.

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