Granulometry of Aerosols Containing Transuranium Elements in the Workplace: An Estimate Using Autoradiographic Analysis
Granulometry of Aerosols Containing Transuranium Elements in the Workplace: An Estimate Using Autoradiographic Analysis
复制标题
工作场所中含有超铀元素的气溶胶的粒度测定：使用放射自显影分析进行估计
DOI：
10.1093/annhyg/46.suppl_1.292
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Guillet
中科院分区：
文献类型：
--
作者：
P. Fritsch;K. Guillet
本研究的目的是开发一种新的方法来表征的锕系元素氧化物的粒度在工作场所收集的混合氧化物核燃料的制造过程中，根据MIMAS过程。分析的样品是来自连续收集气溶胶的装置的过滤器。该方法是基于放射自显影分析结合电子显微镜研究。我们在这里报告的结果后，试点放射自显影实验。在接触放射自显影（固体径迹检测器CR 39）后，含有α发射体的颗粒被可视化为斑点并定位在过滤器上。然后在最佳曝光时间后通过径迹计数测量每个斑点的活性，以获得30-300个径迹/斑点。遇到的粒子从几μBq到几Bq。假设颗粒为工业PuO 2，计算的四个过滤器（包含131-500个点）的活性中值空气动力学直径在3.5-7.1 µm范围内，几何标准差为1.6-1.7 µm。这些值与使用特定设备进行粒度测量后在工作场所测得的值相似。正在进行电子显微镜研究，以验证放射自显影法并确定复杂气溶胶（二氧化铀/氧化钚聚集体、混合氧化物等）的特征。
The aim of this study was to develop a new method to characterize the granulometry of actinide oxides collected in the workplace during the fabrication of MOX nuclear fuel according to the MIMAS process. The samples analysed were filters from the devices continuously collecting aerosols. The method is based on an autoradiographic analysis combined with an electron microscopy study. We report here the results obtained after pilot autoradiography experiments. After contact autoradiography (solid track detector CR39) particles containing α emitters were visualized as spots and localized on the filter. The activity of each spot was then measured by track counting after the optimal exposure time to obtain 30–300 tracks/spot. Particles from a few µBq to a few Bq were encountered. Assuming particles were industrial PuO2, activity median aerodynamic diameters calculated for four filters containing 131–500 spots were in the range 3.5–7.1 µm, with a geometric standard deviation of 1.6–1.7 µm. These values are similar to those measured in the workplace after using specific devices for granulometric measurement. Electron microscopy studies are in progress to validate the autoradiographic method and to characterize complex aerosols (UO2/PuO2 aggregates, MOX, etc.).