Survey and assessment on artificial radioactivity level in Shanghai atmospheric environment

Survey of artificial radioactivity level in Shanghai atmospheric environment took place during Sept. 1989 to Nov. 1991. The result showed that the total β-radioactivity concentration of aerosol in one-day samples and seven-day samples were 9.3 x 10-2 Bq/m3 and 2.6 x 10-2 Bq/m3 respectively, among which the concentrations of 90Sr<1.8 x 10-6 Bq/m3, 137Cs<1.3 x 10-5 Bq/m3; total β-radioactivity in precipitation was 0.78 Bq/m3, among which 90Sr was 1.6 x 10-2 Bq/m2. d, 137Cs<2.4 x 10-3 Bq/m2. d, tritium vapor was 0.09 Bq/m3. The result of statistical analysis and assessment showed that there were no obvious differences at sampling points around Shanghai Municipality, but the seasonal variation showed that in the spring and winter seasons, the concentration was higher than that in the summer and autumn seasons