| Summary: | 碩士 === 中國醫藥大學 === 職業安全與衛生學系碩士班 === 101 === Due to long working hours in the cleanroom for high-tech industry workers, assessing their long-term cumulative exposure to chemical substances and the corresponding health risk is indeed an importance issue. However, the current adopted method simply focuses on assesing their exposures to a single chemical based on a single measurement, which is obviously insufficient to assess their long-term exposures to multiple chemical substances and the corresponding health risks. This study divided cleanroom workers into eight similar exposure groups (SEGs). Through the use of area sampling, direct reading instruments, and model prewdictions, a worker’s long-term exposure database was esatblished for aassessing the real exposure scenarios and health risks of SEGs. This study also provides the contours associated with exposure concentration in the workplace for each SEG, which can be used as a basis to adjust the location of the workstation for reducing workers’ exposures.
This study found that 33 compounds could be detected in the cleanroom workplace atmosphere, of which 9 of which can be measured in the outside air, 7 were found to be the raw material ingredients, the others could be regarded to either the unveiled ingredients in raw materials or process byproducts. Among them, six measured compounds were IARC 2B. The Photo SEG was found with the highest exposure concentration among all invetigated SEGs. The cumulative multiple chemical exposures fell to the range 10-3-10-1 (less than 1), and the corresponding excessive cancer risks fell to 10-6-10-4 (less than 10-3) for all studued SEGs indicating that workers currently exposurs are still acceptable. For controling SEG’s accumulate multiple chemical exposures and the corresponding excessive cancer risks being respectively less than 1 and 10-3, if the PID direct reading measured value is used as a surrogate, then the measured PID values should be controlled within the range of 13.84-81.99 ppm. In addition, this study also found that productivity can also be used as a surrogate for controlling workers’ exposures. Even at the full load condition this study found that workers multiple chemical exposures still fall to the acceptable range.
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