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Radiation Protection Dosimetry 2004 111(1):111-113; doi:10.1093/rpd/nch371
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Radiation Protection Dosimetry Vol. 111, No. 1 © Oxford University Press 2004; all rights reserved

Variation in indoor thoron levels in Mexico City dwellings

T. Martinez1,*, M. Navarrete1, P. Gonzalez2 and A Ramírez1

1 National University of Mexico, Faculty of Chemistry, Building D, Ciudad Universitaria, 04510, Mexico City, Mexico
2 National Institute of Nuclear Research, Ocoyoacac, Mex. 05045, Mexico

* Corresponding author: tmc{at}servidor.unam.mx

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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