Pettersson H B, Koperski J
Department of Radiation Physics, Lund University Teaching Hospital, Sweden.
Health Phys. 1991 May;60(5):681-90. doi: 10.1097/00004032-199105000-00007.
Detailed investigations of the aerial dispersion of radioactive dust from the biggest open-pit U mining and milling operation in Australia were carried out. Spatial distributions of the long-lived radionuclides of 238U series and their origin, i.e., mining and milling operations vs. natural background radiation, have been studied. Horizontal flux, dry deposition, and ground resuspension of the radionuclides were investigated along a 50-km transect in the direction of the prevailing monsoonal winds in the region. The study was performed by means of unconventional "sticky vinyl" passive dust collectors, occasionally supported by high-volume air filter samplers. The data from the flux measurements show an inverse square to inverse cubic dependence, and the dry deposition exhibits an inverse square dependence, of radionuclide load vs. distance. The pit has been the predominant contributor of long-lived U series radionuclides to the environment within the radius of several kilometers from the operations. An aerial dispersion computer code (LUCIFER), based on a Gaussian plume model, was developed for the project. Experimental data were used as the code input data. Good agreement between the measured data and the normalized computed results was obtained.
对澳大利亚最大的露天铀矿开采和选矿作业中放射性粉尘的大气扩散进行了详细调查。研究了238U系列长寿命放射性核素的空间分布及其来源，即采矿和选矿作业与自然本底辐射的情况。沿着该地区盛行季风风向的一条50公里长的样带，对放射性核素的水平通量、干沉降和地面再悬浮进行了调查。该研究通过非常规的“粘性乙烯基”被动式集尘器进行，偶尔由大容量空气过滤器采样器辅助。通量测量数据表明，放射性核素负荷与距离的关系呈平方反比至立方反比依赖关系，干沉降呈平方反比依赖关系。在距作业区几公里半径范围内，该矿坑一直是长寿命U系列放射性核素向环境的主要贡献源。为该项目开发了一个基于高斯烟羽模型的大气扩散计算机代码（LUCIFER）。实验数据用作代码输入数据。实测数据与归一化计算结果之间取得了良好的一致性。
