【摘要】 实验采集了某污染区的土壤和分级气溶胶样品,分析了其中239Pu的含量,研究了含钚再悬浮气溶胶的粒度特征,并结合土壤风蚀机理对核素再悬浮的过程进行了讨论。研究表明:在未扰动情况下,239Pu的活度中值空气动力学直径均值为3.1μm;在扰动情况下,大颗粒的浓度显著增加,而小颗粒中的239Pu的比例明显下降;239Pu的典型粒度分布样式基本符合文献提出的137Cs的部分粒度分布样式;再悬浮气溶胶中的239Pu的富集因子在0.002~0.2,与粒径的关系不显著。更多还原

【Abstract】 Soil and fractioned aerosol samples were collected at some contaminated areas,and the 239Pu content was determined. The size distribution characteristics of plutonium in the resuspended aerosol were analyzed. The results show that the average value of activity median aerodynamic diameter of plutonium is 3. 1 μm under undisturbed conditions and increased to 12 μm under disturbed conditions. The typical size distribution patterns of plutonium are consistent with 137 Cs size distribution patterns proposed by other researchers. The enrichment factors were found to be 0. 002—0. 2 and showed no obvious relationship with diameters. Also,taking the mechanism of wind erosion of soil into consideration,the process of radionuclide resuspension is discussed.更多还原