Abstract
Measurements of activity concentrations of 131I; 129mTe, 132Te, 134Cs and; 136Cs, 137Cs in aerosol were carried out in daily samples after the Fukushima accident during the period of March–April, 2011 in Vilnius. The maximum activity concentrations of 131I and 137Cs were found to be 3700μBqm−3 and 1040μBqm−3, respectively. Variations in activity ratios of 132Te/129mTe and 137Cs/136Cs observed after the accident were explained by the decay of the short-lived isotopes, while those in 134Cs/137Cs by the dilution effect of the Chernobyl-derived 137Cs. It was found that different behaviours of highly volatile 131I and 137Cs resulted in enrichment of ground level aerosol particles by 131I with respect to 137Cs. Simulated activity concentrations of 137Cs attached to aerosol particles for the Vilnius site reasonably agreed with measured activities in aerosol samples during the Fukushima accident.
Published Version
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