某污染区含钚再悬浮气溶胶的粒度特征

摘要/Abstract

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3.1 μm;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。

关键词: 再悬浮, 气溶胶, 钚, 粒度

Abstract: Soil and fractioned aerosol samples were collected at some contaminated areas, and the ²³⁹Pucontent 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 ¹³⁷Cs 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.

Key words: resuspension, aerosol, plutonium, size distribution

中图分类号:

X508

李冬梅, 刘龙波, 周国庆, 王旭辉, 金玉仁. 某污染区含钚再悬浮气溶胶的粒度特征[J]. 辐射防护, 2014, 34(6): 376-380.

Li Dongmei, Liu Longbo, Zhou Guoqing, Wang Xuhui, Jin Yuren. Size Distribution Characteristics of Plutonium in Resuspended Aerosol at Contaminated Areas[J]. RADIATION PROTECTION, 2014, 34(6): 376-380.

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