期刊
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
卷 114, 期 -, 页码 66-70出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2012.03.003
关键词
Nuclear reactor accidents; Gamma-emitter fission products; Low-background gamma-ray spectrometry
The radioactivity levels in the air of the radionuclides released by the Fukushima accident were measured at the Laboratoire Souterrain de Modane, in the South-East of France, during the period 25 March-18 April 2011. Air-filters from the ventilation system exposed for one or two days were measured using low-background gamma-ray spectrometry. In this paper we present the activity concentrations obtained for the radionuclides I-131, Te-132, Cs-134, Cs-137, Nb-95, Zr-95, Ru-106, Ba-140/La and Ru-103. The activity concentration of I-131 was of the order of 100 mu Bq/m(3), more than 100 times higher than the activities of other fission products. The highest activities of I-131 were measured as a first peak on 30 March and a second peak on 3-4 April. The activity concentrations of Cs-134 and Cs-137 varied from 5 to 30 mu Bq/m(3). The highest activity concentration recorded for Cs corresponded to the same period as for I-131, with a peak on 2-3 April. The results of the radioactivity concentration levels in grass and mushrooms exposed to the air in the Modane region were also measured. Activity concentrations of I-131 of about 100 mBq/m(2) were found in grass. (C) 2012 Elsevier Ltd. All rights reserved.
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