In recent years, the issue of radon emanation and diffusion has become a critical concern for rare decay experiments, such as JUNO and PandaX-4T. This paper introduces a detector design featuring a symmetric radon detector cavity for the quantitative assessment of membrane materials' radon blocking capabilities. The performance of this design is evaluated through the application of Fick's Law and the diffusion equation considering material solubility. Our detector has completed measurements of radon diffusion coefficients for four types of membrane materials currently used in experiments, which also confirms the rationality of this detector design. The findings are instrumental in guiding the selection and evaluation of optimal materials for radon shielding to reduce radon background, contributing to boost sensitivities of rare event research.
@article{arxiv.2410.06054,
title = {Design and Experimental Application of a Radon Diffusion Chamber for Determining Diffusion Coefficients in Membrane Materials},
author = {Liang-Yu Wu and Lin Si and Yuan Wu and Zhi-Xing Gao and Yue-Kun Heng and Yuan Li and Jiang-Lai Liu and Xiao-Lan Luo and Fei Ma and Yue Meng and Xiao-Hui Qian and Zhi-Cheng Qian and Hao Wang and You-Hui Yun and Gao-Feng Zhang and Jie Zhao},
journal= {arXiv preprint arXiv:2410.06054},
year = {2025}
}