Ye Yong-Jun, Zhang Yun-Feng, Dai Xin-Tao, Ding De-Xin
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, Hunan, 421001, China; School of Environment and Safety Engineering, University of South China, Hengyang, Hunan, 421001, China.
School of Environment and Safety Engineering, University of South China, Hengyang, Hunan, 421001, China.
J Environ Radioact. 2017 Oct;177:135-141. doi: 10.1016/j.jenvrad.2017.06.012. Epub 2017 Jun 27.
The particle size and heaped methods of exhalation media have important effects on physical parameters, such as the free radon production rate, porosity, permeability, and radon diffusion coefficient. However, existing methods for determining those parameters are too complex, and time-consuming. In this study, a novel, systematic determining method was proposed based on nuclide decay, radon diffusion migration theory, and the mass conservation law, and an associated experimental device was designed and manufactured. The parameters of uranium ore heap and sandy soil of radon diffusion coefficient (D), free radon production rate (α), media permeability (k), and porosity (ε) were obtained. At the same time, the practicality of the novel determining method was improved over other methods, with the results showing that accuracy was within the acceptable range of experimental error. This novel method will be of significance for the study of radon migration and exhalation in granulated porous media.
呼气介质的粒径和堆积方式对物理参数有重要影响，如自由氡产生率、孔隙率、渗透率和氡扩散系数。然而，现有的确定这些参数的方法过于复杂且耗时。本研究基于核素衰变、氡扩散迁移理论和质量守恒定律，提出了一种新颖、系统的确定方法，并设计制造了相关实验装置。获得了铀矿堆和砂土的氡扩散系数（D）、自由氡产生率（α）、介质渗透率（k）和孔隙率（ε）等参数。同时，该新颖确定方法的实用性比其他方法有所提高，结果表明精度在实验误差的可接受范围内。这种新颖方法对研究粒状多孔介质中氡的迁移和析出具有重要意义。
