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Main Title Human Subject Age and Activity Level: Factors Addressed in a Biomathematical Deposition Program for Extrapolation Modeling.
Author Martonen, T. B. ; Graham, R. C. ; Hofmann, W. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. Inhalation Toxicology Div. ;Northrop Services, Inc., Research Triangle Park, NC. ;Duke Univ. Medical Center, Durham, NC.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/366;
Stock Number PB90-215930
Additional Subjects Lung ; Anatomy ; Humans ; Mathematical models ; Extrapolation ; Formulas(Mathematics) ; Graphs(Charts) ; Tables(Data) ; Reprints ; Age factors ; Pulmonary alveoli
Library Call Number Additional Info Location Last
NTIS  PB90-215930 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 13p
A deterministic aerosol deposition model, previously validated by data from adult inhalation exposure experiments, is used to study factors affecting particle behavior within the developing human lung. Here, an age dependent lung morphology is presented in which the number of tracheobronchial (TB) generations is complete at birth, but airway dimensions vary with age; the number of pulmonary (P) generations, however, changes with age, as well as alveolated airway dimensions. For the light and heavy respiratory activity levels considered, TB, P and total lung deposition fractions are calculated. For all particle sizes (0.2 - 9.0 micro m) tested, total deposition was minimum for the 30 year old adult and maximum for either of the youngest two subjects (7 and 22 months old). The model is intended to aid in future extrapolation, or age dependent, modeling efforts assessing the threat to human health from airborne contaminants. (Copyright (c) 1989 Health Physics Society, Pergamon Press plc.)