J Environ Radioact. 2012 Dec;114:71-80. doi: 10.1016/j.jenvrad.2011.12.004. Epub 2011 Dec 27.
Radionuclides from the Fukushima accident in the air over Lithuania: measurement and modelling approaches.
Abstract
Analyses
of (131)I, (137)Cs and (134)Cs in airborne aerosols were carried out in
daily samples in Vilnius, Lithuania after the Fukushima accident during
the period of March-April, 2011. The activity concentrations of (131)I
and (137)Cs ranged from 12 μBq/m(3) and 1.4 μBq/m(3) to 3700 μBq/m(3)
and 1040 μBq/m(3), respectively. The activity concentration of
(239,240)Pu in one aerosol sample collected from 23 March to 15 April,
2011 was found to be 44.5 nBq/m(3). The two maxima found in radionuclide
concentrations were related to complicated long-range air mass
transport from Japan across the Pacific, the North America and the
Atlantic Ocean to Central Europe as indicated by modelling. HYSPLIT
backward trajectories and meteorological data were applied for
interpretation of activity variations of measured radionuclides observed
at the site of investigation. (7)Be and (212)Pb activity concentrations
and their ratios were used as tracers of vertical transport of air
masses. Fukushima data were compared with the data obtained during the
Chernobyl accident and in the post Chernobyl period. The activity
concentrations of (131)I and (137)Cs were found to be by 4 orders of
magnitude lower as compared to the Chernobyl accident. The activity
ratio of (134)Cs/(137)Cs was around 1 with small variations only. The
activity ratio of (238)Pu/(239,240)Pu in the aerosol sample was 1.2,
indicating a presence of the spent fuel of different origin than that of
the Chernobyl accident.
Copyright © 2011 Elsevier Ltd. All rights reserved.
Copyright © 2011 Elsevier Ltd. All rights reserved.
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