Abstract: This investigation used solid state nuclear track detector and thermolumiescence dosimeter to measure 100 buildings’ indoor radon concentrations and γ dose rates of the urban and ruralareasin Chengdu. After comparative analysis of the results according to the measuring time, construction structures, stories, the building materials and the metope decoration materials, the results show that the average indoor radon concentration of towns and villages are respectively (39.5±18.1)Bq/m³ and (38.2±16.3)Bq/m³, which are both lower than the world average; theaverage γ dose rate of towns and villages are respectively (120.1±16.1) nSv/h and (124.4±16.7) nSv/h, which have no correlation with radon concentration. The study found that the indoor radon concentration is higher in summer; the indoor radon concentrations of low-risebuildings are higher than that of high-rise buildings because greatly influenced by the environment. With the stories increase the radon concentration isreduced; the building materials and the metope decoration materials of the wall have significant influence on indoor concentration.

Key words: indoor radon concentration, γ does rate, stories, building materials