北方森林土壤中 (210)Pb 和 (210)Po 的分布。
Distribution of (210)Pb and (210)Po in boreal forest soil.
机构信息
Laboratory of Radiochemistry, Department of Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland.
出版信息
Sci Total Environ. 2010 Nov 15;408(24):6165-71. doi: 10.1016/j.scitotenv.2010.09.004.
Vertical distribution and activity contents of (210)Pb and (210)Po were investigated in forest soils of Scots pine-dominated (Pinus sylvestris L.) stands from seven different locations in Finland. The mean total inventory in the soil profile, up to 20cm, of (210)Pb was 4.0kBqm(-2) (range3.1-5.0kBqm(-2)) and (210)Po 5.5kBqm(-2) (range 4.0-7.4kBqm(-2)), the organic soil layer containing 45% of the total inventory of both nuclides. In both the organic and the mineral layers the (210)Po/(210)Pb ratio was close to unity indicating a radioactive equilibrium between them. In the litter layer there was, however, a clear excess of (210)Po suggesting that polonium is recycled via root uptake from the root zone to the ground surface. The activity concentration (Bqkg(-1)) of (210)Pb clearly correlated with organic matter and the Fe, Al and Mn concentrations in soil indicating that radioactive lead is associated both with humic substances and the oxides of iron, aluminium and manganese. Radioactive lead was also seen to follow the behavior of stable lead. No systematic correlation between polonium and soil properties was seen.
我们研究了来自芬兰七个不同地点的以欧洲赤松（Pinus sylvestris L.）为主的森林土壤中（210）Pb 和（210）Po 的垂直分布和活性含量。土壤剖面中（210）Pb 的总活度为 4.0kBqm(-2)（范围为 3.1-5.0kBqm(-2)），（210）Po 为 5.5kBqm(-2)（范围为 4.0-7.4kBqm(-2)），有机土层中含有这两种核素的总活度的 45%。在有机层和矿物质层中，（210）Po/(210)Pb 比值接近 1，表明它们之间存在放射性平衡。然而，在凋落物层中，（210）Po 明显过量，表明钋通过根系从根区吸收到地面进行再循环。（210）Pb 的活度浓度（Bqkg(-1)）与土壤中的有机质以及 Fe、Al 和 Mn 浓度明显相关，表明放射性铅与腐殖质以及铁、铝和锰的氧化物有关。放射性铅的行为也与稳定铅相似。未观察到钋与土壤性质之间存在系统相关性。
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