Source:Journal of Environmental Radioactivity, Volumes 162–163
Author(s): Chongyang Zhou, Guoqing Zhou, Shujuan Feng, Dingwei Huang, Xinhua Zhao, Elisabeth Wieslander, Kirill Khrustalev, Xiaolong Yu, Ziwei Cheng, Rui Wu, Ronghu Zou
To take part in the Integrated Field Exercise in 2014 (IFE14) in Jordan, a rapid on-site inspection radioxenon processing system (XESPM-III) has been developed to monitor radioxenon isotopes (131m,133,133m,135Xe), mainly in subsoil gas. XESPM-III is composed of sampling, purification, and measurement units. The function of the sampling unit is to pre-enrich xenon after the removal of impurities, while the purification unit purifies and separates impurities and prepares a small-volume relatively high concentration of xenon gas as a measuring sample; the purpose of the measurement unit is to analyze stable xenon and measure the radioxenon activity. The parameters used for operation of XESPM-III are as follows: sampling volume, 4 m3 or 2 m3 + 2 m3; daily throughput, 12 × (2 m3) or 6 × (4 m3); volume of gas measuring sample, approximately 7 cm3; recovery, >70%; radon removal coefficient, 10−6; cross contamination, <1%; 133Xe minimum detectable activity concentration, 11 × (2 m3) and 5 × (4 m3) mBq/m3 or 1.4 × (2 m3) and 0.7 × (4 m3) mBq/m3 if measured by HPGe γ spectrometry or a β-γ coincidence counting system using an acquisition time of 40,000 s, respectively. XESPM-III was able to detect 133Xe in subsoil gas during IFE14.
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