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KMID : 0895419910010010047
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Journal of Korean Society of Occupational and Enviromental Hygiene
1991 Volume.1 No. 1 p.47 ~ p.55
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Respirable Coal Dust Exposure Concentration at Work Sites of Underground Coal Mines in Taebaek Area
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Abstract
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Exposure level of respirable coal dust of underground coal mines in Taebaek area was evaluated. Personal air samplers with 10-㎜ nylone cyclones were attached to the coal workers including drillers, coal cutters, their assistants, haulers, and separators. Log-normality of respirable dust exposure concentration were tested by Kolmogorov-Smirnov one-sample test. Differences of means of respirable dust exposure concentration between work sites were tested by one-way ANOVA test and multiple comparison(Scheffe) test. And differences of respirable dust exposure concentration of principal and assistant workers in drilling sites and in coal faces were tested by paired t-test. Relation of respirable dust exposure concentration for the principal workers and their assistants in drilling sites and in coal faces were tested by regression analysis.
The results were as follows :
1. All of the respirable dust concentration were log-normally distributed.
2. There were not only significantly different means of exposure concentration between drillers and coal cutters but between coal cutters and haulers.
3. Means of exposure concentration of drillers and drilling assistants were not significantly different. And means of exposure concentration of coal cutters and coal cutting assistants were not different.
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