Filter Media Characteristics for Alpha CAMs
Filter Type Pore Size Filter ÄP FWHM keV
Millipore
Fluoropore 5 um 0.5"Hg 370
Fluoropore 3 um 0.8"Hg 300
SMWP 5 um 2.0"Hg 450
SSWP 3 um 3.1"Hg 350
AW19 1.2 um 3.8"Hg 450
Durapore 5 um 4.3"Hg 490
AP40 0.7 um 2.6"Hg 490
Bladewerx
Speclon 1.5 1.5 um 2.6"Hg 300
Speclon 5.0 5 um 0.4"Hg 370
Whatman
GFA 0.3 um 2.8"Hg 490
EPM 2000 0.6 um 1.8"Hg 1,000
Gelman
A/E Glass 1.0 um 2.3"Hg 1,000
Versapor 3000 3.0 um 2.3"Hg 450
Hollingsworth & Vose
HV LB5211 0.3 um 1.0"Hg 650
The rated pore size is for >99.99% collection efficiency for
that size particle and greater. All of these filters have >99%
collection efficiency for particles as small as 0.3 um. The
stated pressure drop is for a 40 mm collection diameter with
an air flow rate of 2 ACFM and barometric pressure of
23.1"Hg. The FWHM is for Po-214 at 7.68 MeV and was
determined using a 25 mm collection diameter and a 25 mm
diameter diffused junction detector with a spacing of 4 mm.
The pressure drop will be higher and the FWHM will be
broader at higher barometric pressures.
115
Filter Media Characteristics for Alpha CAMs
Filter Type Pore Size Filter ÄP FWHM keV
Millipore
Fluoropore 5 um 0.5"Hg 370
Fluoropore 3 um 0.8"Hg 300
SMWP 5 um 2.0"Hg 450
SSWP 3 um 3.1"Hg 350
AW19 1.2 um 3.8"Hg 450
Durapore 5 um 4.3"Hg 490
AP40 0.7 um 2.6"Hg 490
Bladewerx
Speclon 1.5 1.5 um 2.6"Hg 300
Speclon 5.0 5 um 0.4"Hg 370
Whatman
GFA 0.3 um 2.8"Hg 490
EPM 2000 0.6 um 1.8"Hg 1,000
Gelman
A/E Glass 1.0 um 2.3"Hg 1,000
Versapor 3000 3.0 um 2.3"Hg 450
Hollingsworth & Vose
HV LB5211 0.3 um 1.0"Hg 650
The rated pore size is for >99.99% collection efficiency for
that size particle and greater. All of these filters have >99%
collection efficiency for particles as small as 0.3 um. The
stated pressure drop is for a 40 mm collection diameter with
an air flow rate of 2 ACFM and barometric pressure of
23.1"Hg. The FWHM is for Po-214 at 7.68 MeV and was
determined using a 25 mm collection diameter and a 25 mm
diameter diffused junction detector with a spacing of 4 mm.
The pressure drop will be higher and the FWHM will be
broader at higher barometric pressures.
115
Filter Media Characteristics for Alpha CAMs
Filter Type Pore Size Filter ÄP FWHM keV
Millipore
Fluoropore 5 um 0.5"Hg 370
Fluoropore 3 um 0.8"Hg 300
SMWP 5 um 2.0"Hg 450
SSWP 3 um 3.1"Hg 350
AW19 1.2 um 3.8"Hg 450
Durapore 5 um 4.3"Hg 490
AP40 0.7 um 2.6"Hg 490
Bladewerx
Speclon 1.5 1.5 um 2.6"Hg 300
Speclon 5.0 5 um 0.4"Hg 370
Whatman
GFA 0.3 um 2.8"Hg 490
EPM 2000 0.6 um 1.8"Hg 1,000
Gelman
A/E Glass 1.0 um 2.3"Hg 1,000
Versapor 3000 3.0 um 2.3"Hg 450
Hollingsworth & Vose
HV LB5211 0.3 um 1.0"Hg 650
The rated pore size is for >99.99% collection efficiency for
that size particle and greater. All of these filters have >99%
collection efficiency for particles as small as 0.3 um. The
stated pressure drop is for a 40 mm collection diameter with
an air flow rate of 2 ACFM and barometric pressure of
23.1"Hg. The FWHM is for Po-214 at 7.68 MeV and was
determined using a 25 mm collection diameter and a 25 mm
diameter diffused junction detector with a spacing of 4 mm.
The pressure drop will be higher and the FWHM will be
broader at higher barometric pressures.
115
Filter Media Characteristics for Alpha CAMs
Filter Type Pore Size Filter ÄP FWHM keV
Millipore
Fluoropore 5 um 0.5"Hg 370
Fluoropore 3 um 0.8"Hg 300
SMWP 5 um 2.0"Hg 450
SSWP 3 um 3.1"Hg 350
AW19 1.2 um 3.8"Hg 450
Durapore 5 um 4.3"Hg 490
AP40 0.7 um 2.6"Hg 490
Bladewerx
Speclon 1.5 1.5 um 2.6"Hg 300
Speclon 5.0 5 um 0.4"Hg 370
Whatman
GFA 0.3 um 2.8"Hg 490
EPM 2000 0.6 um 1.8"Hg 1,000
Gelman
A/E Glass 1.0 um 2.3"Hg 1,000
Versapor 3000 3.0 um 2.3"Hg 450
Hollingsworth & Vose
HV LB5211 0.3 um 1.0"Hg 650
The rated pore size is for >99.99% collection efficiency for
that size particle and greater. All of these filters have >99%
collection efficiency for particles as small as 0.3 um. The
stated pressure drop is for a 40 mm collection diameter with
an air flow rate of 2 ACFM and barometric pressure of
23.1"Hg. The FWHM is for Po-214 at 7.68 MeV and was
determined using a 25 mm collection diameter and a 25 mm
diameter diffused junction detector with a spacing of 4 mm.
The pressure drop will be higher and the FWHM will be
broader at higher barometric pressures.
115
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