Lujanienė G, Byčenkienė S, Povinec P P
Environmental Research Department, SRI Center for Physical Sciences and Technology, Vilnius, Lithuania.
Appl Radiat Isot. 2013 Nov;81:330-4. doi: 10.1016/j.apradiso.2013.03.072. Epub 2013 Apr 6.
Measurements of activity concentrations of (131)I; (129 m)Te, (132)Te, (134)Cs and; (136)Cs, (137)Cs 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 (131)I and (137)Cs were found to be 3,700 μBq m(-3) and 1,040 μBq m(-3), respectively. Variations in activity ratios of (132)Te/(129 m)Te and (137)Cs/(136)Cs observed after the accident were explained by the decay of the short-lived isotopes, while those in (134)Cs/(137)Cs by the dilution effect of the Chernobyl-derived (137)Cs. It was found that different behaviours of highly volatile (131)I and (137)Cs resulted in enrichment of ground level aerosol particles by (131)I with respect to (137)Cs. Simulated activity concentrations of (137)Cs attached to aerosol particles for the Vilnius site reasonably agreed with measured activities in aerosol samples during the Fukushima accident.
2011年3月至4月期间，在福岛事故后，于维尔纽斯对气溶胶中(131)I、(129 m)Te、(132)Te、(134)Cs以及(136)Cs、(137)Cs的活度浓度进行了每日样本测量。发现(131)I和(137)Cs的最大活度浓度分别为3700 μBq m(-3)和1040 μBq m(-3)。事故后观察到的(132)Te/(129 m)Te和(137)Cs/(136)Cs活度比的变化是由短寿命同位素的衰变引起的，而(134)Cs/(137)Cs的变化是由切尔诺贝利源(137)Cs的稀释效应引起的。研究发现，高挥发性的(131)I和(137)Cs的不同行为导致地面气溶胶颗粒中(131)I相对于(137)Cs的富集。维尔纽斯站点气溶胶颗粒附着的(137)Cs的模拟活度浓度与福岛事故期间气溶胶样本的实测活度合理吻合。
