Chen B, Zhuo W
Institute of Radiation Medicine, Fudan University, 2094 Xietu Road, Shanghai, China.
Institute of Radiation Medicine, Fudan University, 2094 Xietu Road, Shanghai, China
Radiat Prot Dosimetry. 2015 Nov;167(1-3):111-4. doi: 10.1093/rpd/ncv225. Epub 2015 Apr 27.
Wire screens are widely used for sampling radioactive aerosols. The front-to-total activity ratio is a critical factor in describing the self-shielding effect of the wire screens. In this study, computational fluid dynamic method was applied to simulate the deposition of aerosols on the surface of the wire screens. Four different types of screens were investigated for particle size varying from 1 nm to 10 µm. Experimental verification was carried out in a radon chamber. The results showed good agreement between experimental data interception and the simulation. Significant differences on the front-to-total activity ratio for the different types of screens were observed when the size of particle was <20 nm.
金属丝网被广泛用于放射性气溶胶的采样。前表面活度与总活度之比是描述金属丝网自屏蔽效应的一个关键因素。在本研究中，应用计算流体动力学方法来模拟气溶胶在金属丝网上的沉积。研究了四种不同类型的丝网，其颗粒尺寸范围为1纳米至10微米。在氡室内进行了实验验证。结果表明实验数据截获与模拟结果之间具有良好的一致性。当颗粒尺寸小于20纳米时，观察到不同类型丝网的前表面活度与总活度之比存在显著差异。
