Analysis of the electrostatic field distribution in the hemispherical internal cell of radon monitors to estimate the collection efficiency of Po-218
Analysis of the electrostatic field distribution in the hemispherical internal cell of radon monitors to estimate the collection efficiency of Po-218
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分析氡气监测仪半球形内部单元的静电场分布以估计 Po-218 的收集效率
DOI：
10.1088/1748-0221/16/12/t12011
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发表时间：
2021-12
影响因子：
1.3
通讯作者：
Yanliang Tan
中科院分区：
文献类型：
--
作者：
Z. Fan;L. Xie;Y. Mo;F. Lin;T. Hu;H. Yuan;Yanliang Tan
氡监测仪半球形内池的收集效率取决于许多因素，其中电场分布和空气相对湿度尤为重要。COMSOL用于模拟具有塑料上表面的内部电池。仿真结果表明，电场梯度相对均匀。假设带正电的Po-218离子在内部电池中感受到的电场是其径向坐标的线性函数，提出了收集效率的数学模型。由该模型得到：1）在相同中和速率和电位下，电场梯度对收集效率的影响不大; 2）在相同中和速率下，收集效率随细胞壁电位的增加而增加。如果中和率小，则最大收集效率的潜在值也小。在相对湿度为6%~ 10%时，当槽壁电位大于5 kV时，捕集效率达到饱和; 3）在相同电位下，中和速率越大，捕集效率越低。在高电位下，中和率对捕集效率的影响相对较小。在高电位和低湿度条件下可以实现更高的收集效率。该研究为设计氡气监测仪内部池以提高Po-218的收集效率提供了理论依据。
The collection efficiency of the hemispherical internal cell of radon monitors depends on many factors, with the distribution of the electric field and the relative humidity of the air being particularly important. COMSOL is used to simulate an internal cell with a plastic upper surface. Simulation results show a relatively uniform gradient of the electric field. Assuming that the electric field felt by the positively charged Po-218 ions in the internal cell is a linear function of its radial coordinate, a mathematical model of the collection efficiency is proposed. From this model, we obtained the following: 1) under the same neutralization rate and potential, the electric field gradient has little effect on the collection efficiency; 2) under the same neutralization rate, the collection efficiency increases with the potential on the cell wall. If the neutralization rate is small, then the potential value for the maximum collection efficiency is also small. At a relative humidity of 6%–10%, the collection efficiency saturates for values of the electric potential on the cell wall larger than 5 kV; 3) under the same potential, a large neutralization rate corresponds to reduced collection efficiency. At high potential, the collection efficiency is relatively less affected by the neutralization rate. Higher collection efficiency can be achieved under high potential and low humidity conditions. This study provides a theoretical foundation to design the internal cell of radon monitor for improving the collection efficiency of Po-218.
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带正电的218Po在水蒸气中中和率的饱和现象分析
影响因子：
2.2
作者：
Yanliang Tan;Detao Xiao;Jian Shan;Qingzhi Zhou;Jingnian Qu
通讯作者：
Jingnian Qu
DOI：
10.1021/bk-1987-0331.ch026
发表时间：
1987
期刊：
--
影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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M. Misdaq;A. Matrane
影响因子：
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作者：
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通讯作者：
HOPKE, PK