Right after the Fukushima reactor accident, a systematic air and wet precipitation sampling was undertaken to detect and quantitatively analyze the radionuclides due to the Fukushima fallout in Milano, Italy 45°N. Radionuclides from Fukushima were first detected at Milano region in a rain water sample, collected during March 27-28, with rainwater activities to be 0.89 Bq L-1 and 0.12 Bq L-1 for 131I and 137Cs respectively. During the same days a snowfall sample was collected from Monte Rosa mountain at a height of 3000 m, with the concentrations of 131I and 137Cs in snowfall to be lower than that in rainwater sample. The dry deposition seems to be very important especially in case of 137Cs. A sample of dry deposition that was collected 9 days after the first rainfall event of 27-28 March, 2011 showed that the dry deposition of 131I and 137Cs was 0.40 Bq m-2 and 0.30 Bq m-2 respectively. Daily monitoring of the airborne activity levels was carried out with a high volume air sampler of Staplex. The flow rate was about 60 cfm resulting in a total daily air volume throughput on average 2200 m3. The collection substrate was Glass Fiber filters. Increased atmospheric radioactivity was detected on air filter taken on 30 March 2011, with the observed activity of 131I to be 322.5 µBq m-3. A maximum activity of 467 µBq m-3, occurred at April 3-4, 2011, while about a week later the activities had fallen to about 50% of peak values, with a general decreasing trend over the following days. In the time period of one month after the nuclear accident, concentrations of 137Cs and 134Cs in air as high as 88 µBq m-3 and 78 µBq m-3, respectively were recorded. The 134Cs/137Cs ratio value in atmospheric samples has remained relatively stable with time at 1. According to the measurements, airborne activity levels remains of no concern for public health in Italy. Finally the concentrations of 131I in sheep and cow milk samples collected on 30 March, 2011 from a farm at Macugnaga, Monte Rosa mountain, were 0.30 Bq L-1 and 0.37 Bq L-1 respectively.
131I, 137Cs, 134Cs from Fukushima fallout at Milano, Italy / F. Groppi, S. Manenti, L. Gini, A. Ioannidou - In: HNPS : Advances in nuclear physics : proceedings of the 20. Hellenic conference on nuclear physics / [a cura di] M. Kokkoris, C. Tsabaris, R. Vlastou. - Athens : National technical university of Athens, 2011 May. - pp. 113-118 (( Intervento presentato al 20. convegno 20. Conference of the Hellenic nuclear physics society tenutosi a Athens nel 2011.
131I, 137Cs, 134Cs from Fukushima fallout at Milano, Italy
F. Groppi;S. Manenti;
2011
Abstract
Right after the Fukushima reactor accident, a systematic air and wet precipitation sampling was undertaken to detect and quantitatively analyze the radionuclides due to the Fukushima fallout in Milano, Italy 45°N. Radionuclides from Fukushima were first detected at Milano region in a rain water sample, collected during March 27-28, with rainwater activities to be 0.89 Bq L-1 and 0.12 Bq L-1 for 131I and 137Cs respectively. During the same days a snowfall sample was collected from Monte Rosa mountain at a height of 3000 m, with the concentrations of 131I and 137Cs in snowfall to be lower than that in rainwater sample. The dry deposition seems to be very important especially in case of 137Cs. A sample of dry deposition that was collected 9 days after the first rainfall event of 27-28 March, 2011 showed that the dry deposition of 131I and 137Cs was 0.40 Bq m-2 and 0.30 Bq m-2 respectively. Daily monitoring of the airborne activity levels was carried out with a high volume air sampler of Staplex. The flow rate was about 60 cfm resulting in a total daily air volume throughput on average 2200 m3. The collection substrate was Glass Fiber filters. Increased atmospheric radioactivity was detected on air filter taken on 30 March 2011, with the observed activity of 131I to be 322.5 µBq m-3. A maximum activity of 467 µBq m-3, occurred at April 3-4, 2011, while about a week later the activities had fallen to about 50% of peak values, with a general decreasing trend over the following days. In the time period of one month after the nuclear accident, concentrations of 137Cs and 134Cs in air as high as 88 µBq m-3 and 78 µBq m-3, respectively were recorded. The 134Cs/137Cs ratio value in atmospheric samples has remained relatively stable with time at 1. According to the measurements, airborne activity levels remains of no concern for public health in Italy. Finally the concentrations of 131I in sheep and cow milk samples collected on 30 March, 2011 from a farm at Macugnaga, Monte Rosa mountain, were 0.30 Bq L-1 and 0.37 Bq L-1 respectively.
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