한국산업보건학회지 (Journal of Korean Society of Occupational and Environmental Hygiene)

  • 제16권1호
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  • Pages.11-16
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  • 2006
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  • 2384-132X(pISSN)
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  • 2289-0564(eISSN)
한국산업보건학회 (Korean Industrial Hygiene Association)
권호 표지

인조광물섬유에 대한 NIOSH 7400 방법의 A 및 B 계수규칙비교

Comparison of NIOSH Method 7400 A and B Counting Rules for Airborne Man-Made Vitreous Fibers

  • 신용철 (인제대학교 보건안전공학과)
  • Sin, Yong Chul (Department of Occupational Health and Safety Engineering, Inje University)
  • 투고 : 2005.09.30
  • 심사 : 2006.03.20
  • 발행 : 2006.03.31
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초록

There are many counting rules for analyzing man-made mineral fibers. The representatives are the NIOSH Method 7400 A and B counting rules. The two rules have different rules of length-to-width ratio(aspect ratio) and diameter. The A rule counts only fibers $>5{\mu}m$ in length, and only fibers with aspect ratio >3:1. The B rule counts only ends of fibers $>5{\mu}m$ in length and $<3{\mu}m$ in diameter, and only fibers with aspect ratio ${\geq}5:1$. The A counting rule had been used before the B counting rule was introduced. The purpose of this study is to compare the A and B counting rules for airborne fibers from various man-made mineral fibers(glass wool fibers, rock wool fibers, refractory ceramic fibers, and continuous filament glass fibers) industries. There were significantly differences between the paired counts of A and B rules in all types of fibers(p<0.05). A rule counts/B rule counts(A/B ratios) were 1.52 for glass fibers, 1.53 for rock wool fibers, 1.19 for RCF, and 1.82 for continuous filament glass fibers. The counting results by A and B counting rules were highly correlated in glass wool fibers, rock wool fibers and refractory ceramic fibers(RCF) samples (r=0.96 for all types of fibers) except continuous filament glass fibers(r=0.82). Regression equations to correct for the differences between counting rules were presented in this paper.

키워드

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