An indoor radon survey was performed in Mexico City in the scope of a lung
cancer epidemiological study. The radon survey was performed in 416 houses
using LR 115 track detectors in a cup array. The exposure time in the dwell
ings was around three months. A few dwellings were monitored with short ter
m Honeywell and Alphaguard automatic radon monitors. The results indicate a
radon concentration arithmetic mean of 145 Bq m(-3), and the higher data f
requency correspond to values lower than 30 Bq m(-3). The distribution of t
he radon concentration is discussed as a function of several local paramete
rs. (C) 2001 Elsevier Science Ltd. All rights reserved.