title: Assessment of the unattached fraction of indoor radon progeny and its contribution to dose: a pilot study in China.
abstract: The unattached fraction of radon progeny (f(p)) is one of the  most important factors for accurate evaluation of the effective dose from a unit of radon exposure, and it may vary greatly in different environments. For precise evaluation of the indoor radon exposure dose and the influence of unattached radon progeny, a pilot survey of f(p) in different environments was carried out in China with a portable and integrating monitor. The dose conversion factors for radon progeny are calculated with LUDEP(®) code, and the dose contributions from the unattached and the attached radon progenies were simultaneously evaluated based on the results of field measurements. The results show that even though the concentrations of radon progeny vary significantly among different indoor environments, the variations of f(p) seem relatively small (9.3-16.9%). The dose contribution from unattached radon progeny is generally larger (30.2-46.2%) in an indoor environment.
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People's Republic of China. qjguo@pku.edu.cn
authors.forename: Qiuju
authors.initials: Q
authors.lastname: Guo
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Lu
authors.initials: L
authors.lastname: Guo
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D002681:China; D010865:Pilot Projects; D011834:Radiation Monitoring; D017687:Radon Daughters / Q000032:analysis*
chemical_list: D000396:Air Pollutants, Radioactive; D017687:Radon Daughters