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Deposition of inhaled charged ultrafine particles in a simple tracheal model [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (10 pages) : digital, PDF file
Additional Creators
New York University. Medical Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The deposition of ultrafine (d [le] 200 nm) particles on airway surfaces is an important determinant of the radiation dose that results from inhalation of radon progeny. The activity median diameter of particles to which radon daughters attach is small (10--140 nm). In the absence of charge, deposition in the upper airways of the respiratory system occurs by impaction for large particles and diffusion for small particles. Sedimentation is negligible due to the high flow rates in these airways. Experiments conducted in hollow casts and in vivo in humans have all shown an increase in deposition due to the particle charge. In vivo experimental results showed that there exists a threshold value of charge on the particle (q[sub c]) above which the electrostatic charge enhances deposition. These experiments were performed for particles for which deposition by diffusion is small (d [le] 300 nm). Deposition of ultrafine particles in the airways may occur by a combined mechanism of diffusion and electrostatic charge.
Report Numbers
E 1.99:doe/er/60592-9
E 1.99: conf-9210221--1
conf-9210221--1
doe/er/60592-9
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Note
Published through SciTech Connect.
01/01/1992.
"doe/er/60592-9"
" conf-9210221--1"
"DE93003162"
American Association for Aerosol Research annual meeting, San Francisco, CA (United States), 12-16 Oct 1992.
Cohen, B.S.; Ayres, L.; Xiong, J.
Funding Information
FG02-87ER60592
View MARC record | catkey: 14793631