Fukushima radionuclides in Vilnius/Lithuania aerosols: Modelling of aerosol transport

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• 作者：G. Lujanien? ; S. By?enkien? ; P.P. Povinec
• 关键词：Fukushima accident ; 131I/137Cs ; 132Te/129mTe ; 134Cs/137Cs ; 137Cs/136Cs ; Modelling of aerosol transport
• 刊名：Applied Radiation and Isotopes
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：81
• 期：Complete
• 页码：330-334
• 全文大小：5864 K

文摘

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 3700 ¦ÌBq m^?3 and 1040 ¦ÌBq m^?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.