Low level air radioactivity measurements in Prague, Czech Republic

Abstract Activity concentrations of radionuclides in the atmosphere have been monitored for over 21 years in the Czech Republic, at present at 10 sampling sites. Results of long-time observation of the radionuclides 137 Cs, 7 Be, 210 Pb, 22 Na, 40 K, 238 Pu, 239,240 Pu, 90 Sr, 85 Kr and 14 C and statistical analysis of the data from the monitoring site in Prague are given in the paper. In 2007 mean activity concentrations of monitored radionuclides at Prague monitoring site in Bq/m 3 were: 85 Kr, 1.6×10 +0 ; 14 C, 5.3×10 −2 ; 137 Cs, 6.8×10 −7 ; 7 Be, 4.3×10 −3 ; 210 Pb, 5.3×10 −4 ; 40 K, 1.8×10 −5 ; 22 Na, 3.5×10 −7 ; 90 Sr, 5–7×10 −8 ; 238 Pu, 1–2×10 −10 and 239,240 Pu, 1.7×10 −9 .