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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
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http://hdl.handle.net/123456789/2171
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| Title: | ATTACHED AND UNATTACHED FRACTION OF RADON DECAY PRODUCTS IN MINE ATMOSPHERE |
| Authors: | Gizachew, Zihon |
| Advisors: | Dr. Tilahun Tesfaye (Ass. Professor) |
| Copyright: | Jun-2010 |
| Date Added: | 3-May-2012 |
| Abstract: | In this work it is analyzed that radon daughters are produced as free ions, but they
become attached to aerosol particles at a rate depending on the aerosol concentration.
Most of the attached activities for Rn-222 progeny were associated with aerosol
particles of the accumulation mode.
Various parameters influencing the concentration of the radon daughter products
in the atmosphere of dwellings are reviewed. Risk factors for lung cancer from
the inhalation of attached and unattached radon decay products are indicated.
Methods for controlling excessive radon exposures in mine atmosphere, indoor, and
outdoor are outlined.
The activity concentration of radon daughters and thoron daughters and also plot
of the amounts of particles with time are discussed. |
| URI: | http://hdl.handle.net/123456789/2171 |
| Appears in: | Thesis - Physics
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