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Applying open-path FTIR with computed tomography to evaluate personal exposures. Part 2: experimental studies
Chang-Fu Wu1, Michael G Yost, Ram A Hashmonay
1Department of Environmental and Occupational Health Sciences, Box 357234, University of Washington, Seattle, WA 98195, USA.
The Annals of Occupational Hygiene
|December 15, 2004
Summary
Computed tomography coupled with OP-FTIR (CT-FTIR) measurements can estimate personal exposures. This method shows promise as a warning system for environmental monitoring.
Area of Science:
- Environmental Science
- Occupational Health
- Measurement Science
Background:
- Accurate personal exposure estimation is crucial for health risk assessment.
- Traditional methods often lack real-time data and spatial resolution.
- Computed tomography coupled with OP-FTIR (CT-FTIR) offers a novel approach.
Purpose of the Study:
- To experimentally evaluate CT-FTIR for estimating personal exposures.
- To compare CT-FTIR estimations with true personal exposures.
- To assess the suitability of CT-FTIR as a warning system.
Main Methods:
- Experimental setup in a ventilation chamber using a robot surrogate.
- Release of carbon monoxide tracer gas from a line source.
- Real-time tracking of robot location via video analysis.
- Calculation of estimated exposures using area sampling and CT-FTIR data.
Main Results:
- Average regression slope between true and estimated exposures was 0.76.
- Concordance correlation factor (CCF) for CT-FTIR was 0.52.
- Kriging with an exponential algorithm improved CCF from 0.60 to 0.75.
Conclusions:
- CT-FTIR shows potential for personal exposure estimation.
- Further optimization of spatial basis functions may enhance accuracy.
- The approach is suitable for developing a warning system.