Optimizing the Internal Cell Structure of the Radon Monitor Based on Electrostatic Collection Method.
Optimizing the Internal Cell Structure of the Radon Monitor Based on Electrostatic Collection Method.
复制标题
DOI：
10.1093/rpd/ncac174
复制
发表时间：
2022-08
影响因子：
1
通讯作者：
Z. Fan;Lin Xie;F. Lin;T. Hu;Yixiang Mo;H. Yuan;Y. Tan
中科院分区：
文献类型：
--
作者：
Z. Fan;Lin Xie;F. Lin;T. Hu;Yixiang Mo;H. Yuan;Y. Tan
当Rn-222衰变时，会发射出α粒子，而残留的钋原子核会向相反的方向反冲。在反冲路径的末端，88%的钋原子带有正电荷，12%是中性的。本文研究了静电捕集式氡监测器60 ml半球形内池中的电位分布，以降低带正电的Po-218与空气中水蒸气电离产生的OH-的结合几率。利用COMSOL软件模拟了在27°C、0.1Mpa压力下，静电收集法测氡仪内部电池的电位分布。为了提高Po-218离子的收集效率，分别计算了内池上表面为塑料、不带电金属和带电金属时，沿沿着和倾斜方向的平均收集时间。假设内电池中气体均匀分布，结果表明，如果半球形内电池的上表面为塑料或不带电金属，则内电池中形成的电势更均匀，有利于减少带正电的Po-218离子的总收集时间，从而提高收集效率。模拟结果可为静电收集法测氡仪内部单元结构的优化设计提供有效参考。
As Rn-222 decays, an alpha particle is emitted and the residual polonium nucleus recoils in the opposite direction. At the end of the recoil path, 88% of the polonium atoms have a positive charge and 12% are neutral. The electric potential distribution in the 60 ml hemispherical internal cell of the radon monitor based on electrostatic collection is studied for reducing the combined probability of the positively charged Po-218 and the OH- produced by the ionization of water vapour in the air. The COMSOL software is used to simulate the electric potential distribution in the internal cell of the radon monitor based on the electrostatic collection method at 27°C, a pressure of 0.1 Mpa. For improving the collection efficiency of Po-218 ions, the average collection time along vertical and oblique lines is calculated when the upper surface of the internal cell is plastic, uncharged metal and charged metal, respectively. Assuming that the gas in the internal cell is uniformly distributed, the results show that if the upper surface of the hemispherical internal cell is plastic or uncharged metal, the electric potential formed in the internal cell is more uniform, and it is beneficial to reduce the total collection time of the positively charged Po-218 ions, thereby improving collection efficiency. The simulation results can be used as an effective reference for optimizing the design of the internal cell structure of the radon monitor based on electrostatic collection method.