Table I. Fiber Exposure Indices Evaluated.
| Fiber exposure index | Fiber exposure index fiber dimensions | Fiber dimensions used for simulations |
|---|---|---|
| Stanton [1981] | Diameter <0.25 μm, Length >8.0 μm, Aspect Ratio≥3:1 | Diameter <0.25 μm, Length ≥5.0 μm, Aspect Ratio≥3:1 |
| Pott [1974] | Diameter <1.0 μm, Length >3.0 μm, Aspect Ratio≥5:1 | Diameter <1.0 μm, Length >3.0 μm, Aspect Ratio≥3:1a |
| Modified Lippman [1990]b | Diameter >0.15 μm, Length >10.0 μm, Aspect Ratio≥3:1 | Diameter >0.25 μm, Length ≥15.0 μm, Aspect Ratio≥3:1 |
a
An aspect ratio of 3-to-1 was used in the JEM. Approximately 25% of fibers had aspect ratios <5:1.
b
Lippmann index included fibers >10 μm; however,the closest category in the current data was 15.0 μm.