| Summary: | 碩士 === 國立成功大學 === 環境醫學研究所 === 90 === Abstract
The inhalable aerosol sampling convention is broadly used in industrial hygiene. This convention is based on experimental data conducted at environmental winspeeeds of 1 ~ 4 m/s. Some researchers questioned its application in calm air environment because of the low winspeed (usually lower than 0.3 m/s) in real workplaces. This study measures aspiration efficiencies of a manikin and sampling efficiencies of personal aerosol samplers (37 mm closed-face, open-face cassette and IOM sampler), and tried to find out a new inhalable convention for calm air environment. In the evaluation of samplers, it was found that all samplers’ collection efficiency was lower than the convention. For the 37 mm closed-face cassette, its collection efficiency was different from the result of Kenny et al. in 1997 and 1999. For the 37 mm open-face cassette and the IOM sampler, the measured results were similar to those of Kenny et al. in 1997. The difference may come from the relative velocity caused by rotating of manikin and hanging location of samplers, and the effects of sampler’s shape, size of entry and the angle between sampler and body. A breathing machine, together with a manikin, were used to simulate the breathing modes of human (light, moderate and heavy work) to develop an aspiration efficiency curve under the above three work conditions. It was found that the trend obtained from this study was similar to that of Hsu and Swift (1999), but with lower values, because of different ways in collecting particles. Basing on this study, a new inhalable convention for calm air environment should be established. In addition, future studies on investigating both the collection efficiency of sampler and aspiration efficiency of manikin should consider the effects associated with the rotating manikin and placed location of aerosol samplers.
Keywords: calm air environment, inhalable aerosol sampling convention, aspiration efficiency, collecting efficiency
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