Variation in indoor thoron levels in Mexico City dwellings

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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.