title: Errors in measurements of 222Rn in methane and carbon dioxide using scintillation cells calibrated for 222Rn in air.
abstract: Scintillation cells are used typically for measuring the concentration of (222)Rn in air and are calibrated for that purpose. However, scintillation cells are sometimes used for measuring (222)Rn in natural gas or carbon dioxide. The counting efficiencies of scintillation cells for measurements of (222)Rn in these gases should be different from those for measuring (222)Rn in air because the ranges of alpha particles emitted by (222)Rn and its progeny are greater in methane and smaller in carbon dioxide than in air. If these effects are not taken into consideration, measurements of (222)Rn in natural gas will be biased high and in carbon dioxide will be biased low. The authors previously investigated the effects of barometric pressure on measurements of (222)Rn in air using scintillation cells. A modeling technique was used in a previous study to calculate theoretical errors that would result if atmospheric pressure were not considered. In the current study, the same modeling technique was used to calculate theoretical errors that would be made for measurements of (222)Rn in methane and carbon dioxide if the calibration for (222)Rn in air were used. Results are presented for four types of scintillation cells of varying geometries and for barometric pressures representative of four elevations ranging from sea level to 1,963 m (6,440 feet). These results indicate that the errors introduced by the ranges of the alpha particles in gases different from air can be significant. Depending on the type of cell and the local pressure, a measurement of (222)Rn in methane may be biased high by 2-7%, while a measurement of (222)Rn in CO2 may be biased low by 15-20% if the calibration for (222)Rn in air is used.
authors.affiliation: *Bowser-Morner, Inc., 4518 Taylorsville Road, Dayton, OH 45424; †Physics Department, University of Colorado-Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918; ‡UCCS Center for the Biofrontiers Institute, University of Colorado-Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918.
authors.forename: Phillip H
authors.initials: PH
authors.lastname: Jenkins
authors.forename: James F
authors.initials: JF
authors.lastname: Burkhart
authors.forename: Robert E
authors.initials: RE
authors.lastname: Camley
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D000399:Air Pressure; D000512:Alpha Particles; D002138:Calibration; D002245:Carbon Dioxide / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D008962:Models, Theoretical; D011886:Radon / Q000032:analysis*; D012588:Scintillation Counting
chemical_list: D000396:Air Pollutants, Radioactive; D002245:Carbon Dioxide; D008697:Methane; D011886:Radon