Asbestos Fibers and Other Elongate Mineral Particles: State of the ...

efficiency, regardless of sampler orientation with
respect to wind direction:
132
IPM(d ae) = 0.5 (1 + exp[−0.06 d ae]) ± 10; for
0 < d ae ≤ 100 µm
Where IPM(d ae) = the collection efficiency
and d ae is the aerodynamic
diameter in µm.
[ACGIH 1999]
Respirable particulate matter: Particles that
deposit anywhere in the gas-exchange region
of the lung. This varies by species, but
for humans such matter can be approximated
as those particles captured according to the
following collection efficiency: RPM(d ae) =
IPM(d ae)[1−F(x)]
Where F(x) = cumulative probability function
of the standardized normal
variable, x.
x = ln(d ae/4.25 µm)/ln(1.5) [ACGIH 1999]
Thoracic particulate matter: Particles that
deposit anywhere within the lung airways and
the gas-exchange region. This varies by species,
but for humans such matter can be approximated
as those particles captured according to
the following capture efficiency: TPM(d ae) =
IPM(d ae)[1−F(x)]
Where F(x) = cumulative probability function
of the standardized normal
variable, x
x = ln(d ae/11.64 µm)/ln(1.5) [ACGIH 1999]
6.4 Definitions of General
Mineralogical Terms
and Specific Minerals
Definitions from several sources are provided in
the following tables for many of the mineralogical
terms used in this Roadmap. Definitions of
some terms in this table differ. Also, definitions
of these same terms, as used by various authors
whose work has been cited in this Roadmap,
may vary from those provided here. It is not
possible to know and/or provide each of the
variant definitions.
6.5 References for Definitions
of General Mineralogical
Terms, Specific Minerals,
and Inhalational Terms
ACGIH (American Conference of Governmental
Industrial Hygienists) [1999]. Particle size–selective
sampling for particulate air contaminants. Vincent
JH, ed. Cincinnati, OH: ACGIH.
American Geological Institute [2005]. Glossary
of Geology, 5th ed. Neuendorf KKE, Mehl
JP, Jackson JA, eds. Alexandria, VA: American
Geological Institute.
Leake BE, Woolley AR, Arps CES, Birch WD,
Gilbert CM, Grice JD, Hawthorne FC, Kato A,
Kisch HF, Krivovichev VG, Linthout K, Laird J,
Mandarino JA, Maresch WV, Nickel EH, Rock
NMS, Schumacher JC, Smith DC, Stephenson
NCN, Ungaretti L, Whittaker EJW, Youzhi G
[1997]. Nomenclature of the amphiboles: report
of the Subcommittee on Amphiboles of
the International Mineralogical Association
Commission on new minerals and mineral
names. Can Mineral 35:219–246.
NIOSH [1990a]. Comments of the National
Institute for Occupational Safety and Health
on the Occupational Safety and Health Administration’s
Notice of Proposed Rulemaking on
Occupational Exposure to Asbestos, Tremolite,
Anthophyllite, and Actinolite. OSHA Docket
NIOSH CIB 62 • Asbestos