Zalewska T, Lipska J
Institute of Meteorology and Water Management, Maritime Branch, Waszyngtona 42, 81-342 Gdynia, Poland.
J Environ Radioact. 2006;91(1-2):1-14. doi: 10.1016/j.jenvrad.2006.08.001. Epub 2006 Sep 18.
Changes of the (137)Cs activity concentrations in the southern Baltic Sea waters were investigated over the period 2000-2004 and distribution of the (90)Sr concentrations was determined in 2004. In the discriminated period further decrease of (137)Cs concentrations was observed. The average activity concentration of (137)Cs declined from 59.4Bq/m(3) in 2000 to 45.1Bq/m(3) in 2004. The greatest changes of (137)Cs activities occurred in 2003 as a consequence of the medium-size inflow of a saline waters from the North Sea. This inflow affected (137)Cs activities as well as its distribution in the Baltic Sea. Changes in (90)Sr activity concentrations proceeded at much slower rate. The average activity concentration of (90)Sr was equal to 8.7Bq/m(3) in 2004. The annual fluvial (137)Cs fluxes from the Vistula river were also estimated. In 2000, the (137)Cs load from Vistula was of an order of 0.15TBq/year, and in 2004 0.05TBq/year.
2000年至2004年期间，对波罗的海南部海域中铯-137活度浓度的变化进行了调查，并于2004年测定了锶-90浓度的分布情况。在该甄别时间段内，观察到铯-137浓度进一步下降。铯-137的平均活度浓度从2000年的59.4贝可勒尔/立方米降至2004年的45.1贝可勒尔/立方米。铯-137活度的最大变化发生在2003年，这是北海中等规模盐水流入的结果。这种流入影响了铯-137的活度及其在波罗的海的分布。锶-90活度浓度的变化速度要慢得多。2004年，锶-90的平均活度浓度为8.7贝可勒尔/立方米。还估算了维斯瓦河每年的铯-137河流通量。2000年，维斯瓦河的铯-137负荷约为0.15太贝可勒尔/年，2004年为0.05太贝可勒尔/年。
