Abstract: By using an IED-3000 portable emanometer produced by Beijing Nuclear Instrument Plant, this paper conducted a preliminary investigation on the radon concentration of soil and air in Aba, Sichuan. The results reveal three aspects as follows: (1) the radon concentration of air in the study area is around background value of 185 Bq/m3; (2) the radon concentration of soil ranges from 2,736 Bq/m3 to 93,486 Bq/m3 with average value of 26,021 Bq/m3, which is higher than the average value of the other domestic cities of 7,300 Bq/m3, and the average values of radon concentration in 91 measured points are over 20,000 Bq/m3 among 156 measured points; (3) the radon concentration of soil in five districts is sorted in descending order as Heishui＞Maerkang＞Rangtang＞Aba＞Hongyuan. The radon concentration of soil in Aba is affected by geological environment, soil porosity, geotechnical properties, moisture content of soil, and the radon concentration of soil in most districts of the study area is extremely high, thus it is necessary to take measures to control and lower indoor radon concentration of the study area.

Key words: Aba,Sichuan, soil, radon, moisture content, concentration