Erratum

In the July 2008 article entitled, “Presence of Airborne Fibers in Tungsten Refining and Manufacturing Processes:

Preliminary Characterization,” by John L. McKernan, Mark A. Toraason, and Joseph E. Fernback, the GM (GSD) column is missing under the Aerodynamic Diameter heading in Table II.

The corrected table follows.

TABLE II Airborne Fiber Dimensions by Tungsten Refining and Manufacturing Process

	Process			Length (μm)			Diameter (μm)			Aerodynamic Diameter (μ m)^A
Building	Name	Side	n′ ^B	Range	AM ± SD ^C ^, ^D	GM (GSD) ^E ^, ^F	Range	AM ± SD ^C ^, ^D	GM (GSD) ^E ^, ^F	Range	AM ± SD ^C ^, ^D	GM (GSD) ^E ^, ^F
A	Calcining	Product	100	0.64–16	3.1 ± 2.3	2.4 (2.0)	0.064–1.3	0.27 ± 0.19	0.22 (1.9)	0.49–8.0	1.9 ± 1.3	1.6 (1.8)
A	Calcining	Product	100	0.51–3.2	1.2 ± 0.6	1.1 (1.6)	0.064–0.76	0.16 ± 0.10	0.14 (1.7)	0.44–4.4	1.1 ± 0.57	0.9 (1.6)
B	Carburizing	Feed	ND	—	—	—	—	—	—	—	—	—
B	Carburizing	Product	18	1.9–8.9	4.0 ± 2.0	3.6 (1.6)	0.32–2.5	0.88 ± 0.54	0.76 (1.7)	2.2–15	5.4 ± 3.1	4.7 (1.6)
A	Reduction	Feed	12	1.1–19	4.4 ± 5.4	2.8 (2.4)	0.13–3.5	0.86 ± 1.1	0.51 (2.7)	0.90–20	5.4 ± 6.4	3.3 (2.6)
A	Reduction	Feed	115	0.64–19	2.4 ± 1.9	2.0 (1.7)	0.064–1.6	0.34 ± 0.23	0.29 (1.7)	0.46–9.9	2.3 ± 1.5	2.0 (1.7)
A	Reduction	Feed	64	0.64–5.1	1.8 ± 1.0	1.6 (1.7)	0.064–0.95	0.27 ± 0.16	0.24 (1.7)	0.46–6.1	1.8 ± 1.0	1.6 (1.6)
A	Reduction	Feed	102	0.64–7.0	2.1 ± 1.0	1.9 (1.5)	0.064–0.83	0.30 ± 0.15	0.27 (1.6)	0.49–5.4	2.0 ± 0.93	1.8 (1.6)
A	Reduction	Product	49	0.51–6.4	2.0 ± 1.4	1.6 (1.9)	0.064–0.76	0.28 ± 0.17	0.23 (2.0)	0.44–4.6	1.9 ± 1.1	1.6 (1.9)
A	Reduction	Product	18	0.64–11	2.3 ± 2.4	1.7 (2.1)	0.13–2.2	0.38 ± 0.53	0.24 (2.3)	0.81–14	2.4 ± 3.3	1.6 (2.2)
OVERALL			578	0.51–19	2.2 ± 1.9	1.8 (1.9)	0.064–3.5	0.31 ± 0.30	0.24 (2.0)	0.44–20	2.0 ± 1.8	1.6 (1.9)

Notes

^A Orientation averaged.

^B n′ = Number of fibers with dimensions L > 0.5 μ m, D > 0.01 μ m, and AR ≥ 3:1.

^C AM = Arithmetic mean.

^D SD =Standard deviation.

^E GM =Geometric mean.

^F GSD = Geometric standard deviation.