title: Determination of thoron equilibrium factor from simultaneous long-term thoron and its progeny measurements.
abstract: With 3-month simultaneous measurements of thoron and its progeny concentrations in the lowest floors of 109 homes, the geometric mean (GM) of thoron equilibrium factor was determined to be 0.019 with a geometric standard deviation (GSD) of 3.63. Combined with the analysis from results obtained from a previous study in 138 homes, the GM of thoron equilibrium factor was determined to be 0.022 with a GSD of 3.02. The results indicate that the F value of 0.02 for thoron recommended by UNSCEAR is a reasonable value for those Canadian homes tested.
authors.affiliation: Radiation Protection Bureau, Health Canada, 2720 Riverside Drive, Ottawa, Canada, K1A 0K9. jing.chen@hc-sc.gc.ca
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Deborah
authors.initials: D
authors.lastname: Moir
authors.forename: Atsuyuki
authors.initials: A
authors.lastname: Sorimachi
authors.forename: Miroslaw
authors.initials: M
authors.lastname: Janik
authors.forename: Shinji
authors.initials: S
authors.lastname: Tokonami
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D002170:Canada; D006798:Housing; D011834:Radiation Monitoring / Q000379:methods; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*
chemical_list: D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011886:Radon