Rayleigh Scattering Measurements of Several Fluorocarbon Gases

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Integrating nephelometers are commonly used to monitor airborne particulate matter. However, they must be calibrated prior to use. The Rayleigh scattering coefficients (bRS, Mm-1), scattering cross sections (RS, cm2), and Rayleigh multipliers for tetrafluoromethane (R-14), sulfur hexafluoride, pentafluoroethane (HFC-125), hexafluoropropene (HFC-216), 1,1,1,2,3,3,3,-heptafluoropropane (HFC-227ea), and octafluorocyclobutane (C-318) are reported from measurements made using a Radiance Research M903 integrating nephelometer operating at  = 530 nm and calibration with gases of known scattering constants. Rayleigh multipliers (± 90% conf. int.) were found to be 2.6 ± 0.5, 6.60 ± 0.07, 7.5 ± 1, 14.8 ± 0.9, 15.6 ± 0.5, and 22.3 ± 0.8 times that of air, respectively. To the best of our knowledge, these are the first reported values for R-14, HFC-216, HFC-125, and C-318. Experimental accuracy is supported through measurements of values for SF6 and HFC-227ea which agree to within 3% of pr
Original languageEnglish
Pages (from-to)3294
JournalJ. Environmental Monitoring
StatePublished - Nov 2011


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