Fig 1.
Model 1-N95 cup-shaped respirator.
Fig 2.
Model 2-N95 pouch/duck-bill respirator.
Fig 3.
Summary of experimental methods.
Abbreviations: FPT, Filter Penetration Testbed; LSFS, Large-scale filtration system.
Table 1.
Alanine dosimetry measurements.
Fig 4.
Schematic of Filter Penetration Testbed (FPT).
Model 1 cup shape respirator was tested on the FPT. Abbreviations: DMA, differential mobility analyzer; CPC, condensation particle counter.
Fig 5.
Schematic of Large-Scale Filtration System (LSFS).
Model 2 bill shaped respirator was tested on the LSFS. Abbreviations: EC, electrostatic classifier; DMA, differential mobility analyzer; WCPC, water based condensation particle counter; HEPA, high-efficiency particulate air.
Fig 6.
Efficiency reduction of irradiated Model 2 respirator.
Efficiency reduction of 25 kGy(tissue) Model 2 respirator when compared to control respirator on the LSFS. Note that the small particle sizes in the range of 10–20 nm are heavily influenced by many factors (such as temperature) and the slight increase in efficiency needs further investigation.
Table 2.
Efficiency reduction of Model 1 respirator.
Table 3.
Trek 344 electrostatic potential measurement of various layers within respirators.
Table 4.
Trek 821HH electrostatic potential measurement of various layers within respirators.