Short and long term indoor radon survey in Mexico City

Abstract 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 dwellings was around three months. A few dwellings were monitored with short term Honeywell and Alphaguard automatic radon monitors. The results indicate a radon concentration arithmetic mean of 145 Bq m −3 , and the higher data frequency correspond to values lower than 30 Bq m −3 . The distribution of the radon concentration is discussed as a function of several local parameters.