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Variation in indoor thoron levels in Mexico City dwellings
T Martinez1, M Navarrete, P Gonzalez
1National University of Mexico, Faculty of Chemistry, Building D, Ciudad Universitaria, 04510, Mexico City, Mexico. tmc@servidor.unam.mx
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.
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