Geometric Standard Deviation ( g)
3 ni (In di -In dg)2
Di-Octyl Phthalate (DOP)
Also known as di-ethylhexyl phthalate or DEHP. For purposes of this standard, an
aerosol of di-octyl phthalate droplets in clean filtered air.
Di-Octyl Sebacate (DOS)
Also known as di-ethylhexyl sebacate or DEHS. For purposes of this standard an aerosol
of di-octyl sebacate droplets in clean filtered air1.
Filter Test Facility (FTF)
A facility accepted by the DOE specifically to conduct quality assurance inspections and
tests of HEPA filters.
High Efficiency Particulate Air (HEPA) Filter
A throwaway, extended-media, dry type filter with a rigid casing enclosing the full
depths of the pleats. Aerosol collection efficiency of the filter shall be at least 99.97%
specified in Section 5.2.2, Table 1 of DOE-STD-3020-97.
High-Flow Alternative Test System
A method of testing HEPA filters rated at greater than 250 cubic feet per minute (cfm)
that consists of a laser aerosol spectrometer, a microcomputer, an aerosol diluter and a
Laskin nozzle system to generate test aerosol. Penetration is determined at discrete
aerosol particle sizes in the range where maximum penetration occurs.
Dennis, Richard, editor, "Handbook on Aerosols," US DOE/ERDA TID 26608, p. 111, 1976.