The collection efficiency of the hemispherical radon monitors based on electrostatic collection is strongly influenced by the electric field distribution and the relative humidity. Previous studies have been restricted to fitting the electric field using a single-segment, resulting in poor fitting optimality and accuracy. Overestimating or underestimating the fitted value relative to the true value can lead to inaccuracies in estimating the collection efficiency. To address this problem, the aim of this paper is to accurately characterize the electrostatic field of the hemispherical radon monitors using COMSOL software and to fit the potential in a segmented fitting approach. The two-segment fitting method was employed to divide the electric field inside the hemispherical radon monitor into two distinct parts for fitting. The improved fitting model increase the goodness-of-fit by 11.6% over the single-segment fitting model, and improves the accuracy of the collection efficiency of 218Po at different humidity levels. The saturation collection efficiency is also raised, especially when the humidity is greater than 10%, the saturation collection efficiency is increased by 9.2%. Through the improved method, the collection efficiency of 218Po in the hemispherical radon monitor can be accurately estimated and provide technical support for optimizing the electric field of the radon monitor.

中文翻译：

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一种拟合半球形氡气监测仪内部电场以准确估计 218Po 收集效率的新方法


基于静电收集的半球氡气监测仪的收集效率受电场分布和相对湿度的强烈影响。先前的研究仅限于使用单段拟合电场，导致拟合最优性和准确性较差。相对于真实值高估或低估拟合值可能会导致收集效率估计不准确。为了解决这个问题，本文的目的是使用 COMSOL 软件准确地表征半球形氡气监测仪的静电场，并通过分段拟合方法来拟合电势。采用两段拟合法将半球氡气监测仪内部电场分成两个不同的部分进行拟合。改进后的拟合模型比单段拟合模型拟合优度提高了11.6%，提高了不同湿度水平下218Po收集效率的准确性。饱和收集效率也有所提高，特别是当湿度大于10%时，饱和收集效率提高了9.2%。通过改进方法，可以准确估算半球氡气监测仪中218Po的收集效率，为优化氡气监测仪电场提供技术支撑。