title: Variation in indoor thoron levels in Mexico City dwellings.
abstract: This paper presents the results obtained for thoron concentration in 50 single-family dwellings in normal occupancy conditions (open house conditions), measured by a passive electret system (type E-PERM, SSTB configuration) in a 2001-2002 monitoring survey in the Metropolitan Zone of Mexico City. The results show the general log-normal distribution of integrated indoor thoron concentration with annual arithmetic and geometric means of 82 and 55 Bq m(-3), respectively, with ranges from 8 to 234 Bq m(-3) higher than world average of 3 Bq m(-3). The seasonal variation shows the minimum mean values in the summer season that were 35% lower than in autumn.
authors.affiliation: National University of Mexico, Faculty of Chemistry, Building D, Ciudad Universitaria, 04510, Mexico City, Mexico. tmc@servidor.unam.mx
authors.forename: T
authors.initials: T
authors.lastname: Martinez
authors.forename: M
authors.initials: M
authors.lastname: Navarrete
authors.forename: P
authors.initials: P
authors.lastname: Gonzalez
authors.forename: A
authors.initials: A
authors.lastname: Ramírez
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D000531:Altitude; D004781:Environmental Exposure; D005720:Gamma Rays; D019015:Geologic Sediments / Q000032:analysis*; D006798:Housing; D008800:Mexico; D011785:Quality Assurance, Health Care; D011874:Radiometry; D011886:Radon / Q000032:analysis*; D012621:Seasons; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013696:Temperature; D014504:Urban Health
chemical_list: D000396:Air Pollutants, Radioactive; D012990:Soil Pollutants, Radioactive; D011886:Radon