[en] The radioactivity concentrations of ⁷Be, ²¹²Pb and ²¹⁴Pb in the atmosphere of Xi'an suburb were determined from April 2002 to April 2003. A high-volume air sampler and a high resolution gamma-ray spectrometer were used to measure the radioactivity. The annual average concentrations of ⁷Be, ²¹²Pb and ²¹⁴Pb were 6.68 x 10^-3 Bq·m^-3, 0.65 Bq/m³ and 16.06 Bq·m^-3, respectively. The ⁷Be levels were higher in spring than those in other seasons, with a maximum concentration of 16.64 x 10^-3 Bq·m^-3. They reflected obvious seasonal trends. The concentrations of ²¹²Pb and ²¹⁴Pb have strong seasonal trends. The maximum concentrations were 1.71 Bq·m^-3 for ²¹²Pb and 50.11 Bq·m^-3 for ²¹⁴Pb in winter. Precipitation is a major factor affecting the concentrations of ⁷Be, ²¹²Pb and ²¹⁴Pb, the monthly mean values reach minimum in August, when precipitation is the biggest of all the months. Artificial radionuclides, such as ¹³⁷Cs, have not been found. (authors)