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Applying open-path FTIR with computed tomography to evaluate personal exposures. Part 1: simulation studies.

Authors
Wu-CF; Yost-MG; Hashmonay-RA; Larson-TV; Guffey-SE
Source
Ann Occup Hyg 2005 Jan; 49(1):61-71
NIOSHTIC No.
20029069
Abstract
This paper presents the theoretical background and the numerical evaluation results obtained using computed tomography coupled with open-path Fourier transform infrared (CT-FTIR) measurements to estimate personal exposures. In this simulation study, we first tested the one-dimensional scenario with a five-beam segment geometry. A series of Gaussian plumes and the corresponding path-integrated concentrations (PICs) were simulated. The personal exposures were estimated as the average of the point estimates calculated from the workers' locations and the concentration profiles reconstructed from the Smooth Basis Function Minimization algorithm. It was found that the running-average PIC updating strategy has similar performance as the spline PIC updating strategy. However, the latter strategy gives delayed estimates of the workers' exposures since it requires additional measurements before and after the time period of interest. In the two-dimensional scenario, we simulated a series of single-mode bivariate Gaussian plumes with a nine-beam radial geometry. The average of the estimated exposures from the CT-FTIR approach was close to the average of the true exposures. The concordance correlation factors between the true and estimated exposures were reasonably good (between 0.50 and 0.58). This study demonstrated that the CT-FTIR approach is feasible for industrial hygiene monitoring.
Keywords
Exposure-levels; Exposure-assessment; Simulation-methods; Workers; Computer-models; Humans; Mathematical-models; Models; Occupational-exposure
Contact
Department of Environmental and Occupational Health Sciences, Box 357234, University of Washington, Seattle, WA 98195, USA
CODEN
AOHYA3
Publication Date
20050101
Document Type
Journal Article
Email Address
cfwu@u.washington.edu
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002660
Issue of Publication
1
ISSN
0003-4878
Source Name
Annals of Occupational Hygiene
State
WA
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