Radon removal trap design and coefficient testing for the development of an effective radioxenon sampling, separation and measurement system

Publication date: April 2019

Source: Journal of Environmental Radioactivity, Volumes 199–200

Author(s): Chongyang Zhou, Guoqing Zhou, Shujuan Feng, Xinhua Zhao, Dingwei Huang, Zining Tian, Xiaolong Yu, Ziwei Cheng

Abstract

To monitor low-level radioxenon isotopes activity concentrations in the bulk gases, a radioxenon sampling, separation and measurement system has been developed. The xenon enrichment factor of this system is more than 10⁵ after the separation of impurities, including N₂, O₂, CO₂and H₂O, as well as radon and its progenies, such as ²¹⁴Pb and ²¹⁴Bi. Since radon and its progenies interfere with radioxenon measurement, they have to be removed before radioxenon counting. To separate radon from xenon, different dynamic adsorption coefficients of xenon and radon are used to design small radon removal trap to retain radon after eluting xenon, and the ratio between radon and xenon dynamic adsorption coefficient gives the adsorbent weight relationship between the xenon adsorption trap and its related radon removal trap. To test the effectiveness of radon removal, the relative measuring method is used by measuring γ-rays energies of radon progenies in canister filling with either the measuring sample prepared by the system or the original gas. The results show that the radon removal coefficient and the stable xenon recovery, which are two important parameters in the radioxenon system, are at the order of 10⁻⁶ and >70% respectively. These meet the specifications proposed by the Comprehensive Nuclear-Test-Ban Treaty Organization.

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