论文标题
基于SF6气体的稀有事实物理实验的低放射性分子筛子测试ra
Test of low radioactive molecular sieves for radon filtration in SF6 gas-based rare-event physics experiments
论文作者
论文摘要
已证明5A型分子筛（MS）可以从SF $ _6 $气体中删除ra。这对于超敏感的SF $ _6 $基于气体的定向暗物质和相关的稀有物理实验很重要，因为ra可以提供不必要的背景事件的来源。不幸的是，市售的筛子本质上散发着不适合超敏感物理实验的水平。 Nihon University（NU）开发了一种生产低放射性MS的方法。在这项工作中，我们探讨了用于此类实验的NU开发5A型MS的可行性。与市售的Sigma-Aldrich 5A型MS进行了比较。比较是通过计算一个参数来完成的，该参数表明由SF $ _6 $气体捕获的MS每单位ra发出的ra量本质上发出。使用专门改编的Durridge Rad7 ra探测器进行测量。 The NU-developed 5A MS emanated radon up to 61$\pm$9$\%$ less per radon captured (2.1$\pm$0.1)$\times 10^{-3}$, compared to the commercial Sigma-Aldrich MS (5.4$\pm$0.4)$\times 10^{-3}$, making it a better candidate for use in a radon filtration setup for future超敏感的SF $ _6 $基于气体的实验。
Type 5A molecular sieves (MS) have been demonstrated to remove radon from SF$_6$ gas. This is important for ultra-sensitive SF$_6$ gas-based directional dark matter and related rare-event physics experiments, as radon can provide a source of unwanted background events. Unfortunately, commercially available sieves intrinsically emanate radon at levels not suitable for ultra-sensitive physics experiments. A method to produce a low radioactive MS has been developed in Nihon University (NU). In this work, we explore the feasibility of the NU-developed 5A type MS for use in such experiments. A comparison with a commercially available Sigma-Aldrich 5A type MS was made. The comparison was done by calculating a parameter indicating the amount of radon intrinsically emanated by the MS per unit radon captured from SF$_6$ gas. The measurements were made using a specially adapted DURRIDGE RAD7 radon detector. The NU-developed 5A MS emanated radon up to 61$\pm$9$\%$ less per radon captured (2.1$\pm$0.1)$\times 10^{-3}$, compared to the commercial Sigma-Aldrich MS (5.4$\pm$0.4)$\times 10^{-3}$, making it a better candidate for use in a radon filtration setup for future ultra-sensitive SF$_6$ gas based experiments.
