Nielsen, Sven Poul1; Andersson, Kasper Grann1; Miller, Arne1
1 Center for Nuclear Technologies, Technical University of Denmark2 Radioecology and Tracer Studies, Center for Nuclear Technologies, Technical University of Denmark3 Radiation Physics, Center for Nuclear Technologies, Technical University of Denmark
The environmental surveillance of the Risø environment was continued in July - December 2012. The mean concentrations in air were: 0.32±0.31 μBq m–3 of 137Cs, 3.04±0.99 mBq m–3 of 7Be and 0.22±0.18 mBq m–3 of 210Pb (±1 S.D.; N = 26). The depositions by precipitation at Risø in the second half of 2012 were: 0.039 Bq m–2 of 137Cs, 615 Bq m–2 of 7Be, 40.3 Bq m–2 of 210Pb and < 0.6 kBq m–2 of 3H. The average background dose rate (TLD) at Risø (Zone I) was 54 nSv h–1 compared with 58 ± 8 nSv h–1 (±1 S.D.; N = 3) in the four zones around Risø.