sterlitech ptfe  (Sterlitech corporation)

Journal: Radiation Measurements

Article Title: A simulation-driven spectrometric method to determine α particle attenuation in air filters

doi: 10.1016/j.radmeas.2021.106684

Figure Lengend Snippet: Fig. 2. 𝛾energy spectrum measured for PTFE membrane in the region from 200 keV to 1000 keV. The 609 keV peak of 214Bi is clearly present as well as the three peaks of 214Pb (242 keV, 295 keV and 352 keV). 214Bi activity in the filter was determined by fitting the 609 keV peak with a gaussian curve on a linear baseline.

Article Snippet: Filter code CA PTFE Type Fibrous filter Membrane filter Provider CAMFIL Sterlitech Pore size unknown 1 μm Diameter 90mm 82mm Thickness 225(10) μm 90(10) μm Mass 513mg 183mg Chemical formula C2H4O2 C2F4 Pure density 1.3 g cm−3 2.2 g cm−3 Apparent density 0.358(16) g cm−3 0.390(43) g cm−3 Bulk porosity 72.5(12)% 82.3(19)% Flowrate 23m3 h−1 8.5m3 h−1 Sampling duration 30 min 30 min easy access to a natural source of radioactive aerosol, hence making an alternative solution for laboratories that are not equipped with an aeorosol generation facility (e.g. Monsanglant-Louvet et al., 2015).

Techniques: Membrane, Activity Assay

Journal: Radiation Measurements

Article Title: A simulation-driven spectrometric method to determine α particle attenuation in air filters

doi: 10.1016/j.radmeas.2021.106684

Figure Lengend Snippet: Fig. 1. Comparison of 214Po spectra measured on CA and PTFE filters. The two spectra have been normalized to the total number of counts. The peak position (≈7400 keV) is significantly below the 𝛼particle initial energy for 214Po (7686 keV), because of attenuation in the air layer between the filter and the detector. The good agreement in peak positions for the two filters suggests that the counting geometry is well preserved between two consecutive measurements.

Article Snippet: Filter code CA PTFE Type Fibrous filter Membrane filter Provider CAMFIL Sterlitech Pore size unknown 1 μm Diameter 90mm 82mm Thickness 225(10) μm 90(10) μm Mass 513mg 183mg Chemical formula C2H4O2 C2F4 Pure density 1.3 g cm−3 2.2 g cm−3 Apparent density 0.358(16) g cm−3 0.390(43) g cm−3 Bulk porosity 72.5(12)% 82.3(19)% Flowrate 23m3 h−1 8.5m3 h−1 Sampling duration 30 min 30 min easy access to a natural source of radioactive aerosol, hence making an alternative solution for laboratories that are not equipped with an aeorosol generation facility (e.g. Monsanglant-Louvet et al., 2015).

Techniques: Comparison

Journal: Radiation Measurements

Article Title: A simulation-driven spectrometric method to determine α particle attenuation in air filters

doi: 10.1016/j.radmeas.2021.106684

Figure Lengend Snippet: Fig. 5. GATE-simulated 214Po spectra for a few selected depths of emission inside CA and PTFE filters (0 μm, 25 μm to 30 μm, 55 μm to 60 μm, 85 μm to 90 μm, 115 μm to 120 μm and 145 μm to 150 μm). The two last layers are drawn only for CA filters since PTFE filters have a maximum thickness of 90 μm. The depth of emission is indicated on top of the maximum region of each spectrum.

Article Snippet: Filter code CA PTFE Type Fibrous filter Membrane filter Provider CAMFIL Sterlitech Pore size unknown 1 μm Diameter 90mm 82mm Thickness 225(10) μm 90(10) μm Mass 513mg 183mg Chemical formula C2H4O2 C2F4 Pure density 1.3 g cm−3 2.2 g cm−3 Apparent density 0.358(16) g cm−3 0.390(43) g cm−3 Bulk porosity 72.5(12)% 82.3(19)% Flowrate 23m3 h−1 8.5m3 h−1 Sampling duration 30 min 30 min easy access to a natural source of radioactive aerosol, hence making an alternative solution for laboratories that are not equipped with an aeorosol generation facility (e.g. Monsanglant-Louvet et al., 2015).

Techniques:

Journal: Radiation Measurements

Article Title: A simulation-driven spectrometric method to determine α particle attenuation in air filters

doi: 10.1016/j.radmeas.2021.106684

Figure Lengend Snippet: Fig. 4. GATE-simulated 214Po detection efficiency for different depths of emission in- side CA and PTFE filters. Each point corresponds to a 5 μm-thick layer of emission inside the filters, except for the first point that represents the surface layer. Uncertainties (2𝜎) derive from the relative uncertainty of the reference measurement used for the code validation (relative uncertainty of 3.4 %). The detection efficiency values are calculated by integration of the simulated spectrum over the energy region used for experimental efficiency determination (2250 keV to 7500 keV).

Article Snippet: Filter code CA PTFE Type Fibrous filter Membrane filter Provider CAMFIL Sterlitech Pore size unknown 1 μm Diameter 90mm 82mm Thickness 225(10) μm 90(10) μm Mass 513mg 183mg Chemical formula C2H4O2 C2F4 Pure density 1.3 g cm−3 2.2 g cm−3 Apparent density 0.358(16) g cm−3 0.390(43) g cm−3 Bulk porosity 72.5(12)% 82.3(19)% Flowrate 23m3 h−1 8.5m3 h−1 Sampling duration 30 min 30 min easy access to a natural source of radioactive aerosol, hence making an alternative solution for laboratories that are not equipped with an aeorosol generation facility (e.g. Monsanglant-Louvet et al., 2015).

Techniques: Biomarker Discovery

Journal: Radiation Measurements

Article Title: A simulation-driven spectrometric method to determine α particle attenuation in air filters

doi: 10.1016/j.radmeas.2021.106684

Figure Lengend Snippet: Fig. 6. Comparison of experimental and reconstructed 𝛼spectra for (a) CA and (b) PTFE filters.

Article Snippet: Filter code CA PTFE Type Fibrous filter Membrane filter Provider CAMFIL Sterlitech Pore size unknown 1 μm Diameter 90mm 82mm Thickness 225(10) μm 90(10) μm Mass 513mg 183mg Chemical formula C2H4O2 C2F4 Pure density 1.3 g cm−3 2.2 g cm−3 Apparent density 0.358(16) g cm−3 0.390(43) g cm−3 Bulk porosity 72.5(12)% 82.3(19)% Flowrate 23m3 h−1 8.5m3 h−1 Sampling duration 30 min 30 min easy access to a natural source of radioactive aerosol, hence making an alternative solution for laboratories that are not equipped with an aeorosol generation facility (e.g. Monsanglant-Louvet et al., 2015).

Techniques: Comparison

Journal: Radiation Measurements

Article Title: A simulation-driven spectrometric method to determine α particle attenuation in air filters

doi: 10.1016/j.radmeas.2021.106684

Figure Lengend Snippet: Fig. 7. Depth-profiles of 𝛼emission in CA and PTFE filters. Uncertainties (2𝜎) are computed from Eq. (5).

Article Snippet: Filter code CA PTFE Type Fibrous filter Membrane filter Provider CAMFIL Sterlitech Pore size unknown 1 μm Diameter 90mm 82mm Thickness 225(10) μm 90(10) μm Mass 513mg 183mg Chemical formula C2H4O2 C2F4 Pure density 1.3 g cm−3 2.2 g cm−3 Apparent density 0.358(16) g cm−3 0.390(43) g cm−3 Bulk porosity 72.5(12)% 82.3(19)% Flowrate 23m3 h−1 8.5m3 h−1 Sampling duration 30 min 30 min easy access to a natural source of radioactive aerosol, hence making an alternative solution for laboratories that are not equipped with an aeorosol generation facility (e.g. Monsanglant-Louvet et al., 2015).

Techniques: