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Ne-Ar separation using a permeable membrane to measure Ne isotopes for future planetary explorations

机译：Ne-AR分离使用可渗透膜来测量未来行星探索的NE同位素

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摘要

We propose a method using a permeable membrane to separate Ne from Ar for Ne isotope analyses in a future planetary exploration, in particular, for the Martian surface. The results of simulation based on permeation data and theoretical formulas show that significant amounts of Ne-20 without Ar-40 permeate through Won (fluoropolymer elastomer) and Kapton (polyimide) with appropriate thicknesses. Considering the simulation results, the amounts of Ne-20 and Ar-40 that permeate through 1 mm-thick Won and 125 mu m-thick Kapton were determined experimentally. The amounts of permeated Ne-20 agree with those of Ne-20 obtained by the theoretical calculation within experimental uncertainties. The amounts of permeated Ar-40 are as small as those of the background, which is also consistent with the fact that the calculated amounts of Ar-40 through those membranes are several orders of magnitude lower than the background Ar-40. In the present experiments, Ne-20/Ar-40 ratios increased up to 1 for Viton and 200 for Kapton from the terrestrial atmospheric ratio of 1.8 x 10(-3) after permeation for 30 and 60 min, respectively. A Kapton sheet efficiently enhances the Ne-20/Ar-40 ratio and enables measurement of the Ne isotope composition without the significant Ar-40(++) interference in planetary exploration. Assuming the Martian atmospheric pressure (7 hPa) and composition (2.3 ppm for Ne-20 and 1.9% for Ar-40), the amounts of Ne-20 and Ar-40 that permeate through Kapton were calculated. The Ne-20/Ar-40 ratio can be increased up to ca. 1 using 75 mu m-thick Kapton with a duration time of 30-60 min, where the contribution of Ar-40(++) is approximately 10% of Ne-20(+) and the uncertainty after the Ar-40(++) correction is estimated to be a few percent. An effective area of 50 cm(2) is required if the sensitivity of the QMS used in this study is assumed.
机译：我们提出了一种使用渗透膜的方法，将来自AR的NE与NE同位素分析在未来的行星勘探中，特别是对于火星表面。基于渗透数据和理论公式的仿真结果表明，通过Won（含氟聚合物弹性体）和Kapton（聚酰亚胺）具有适当的厚度，没有Ar-40渗透的大量NE-20。考虑到仿真结果，NE-20和AR-40的量通过实验确定了1毫米厚的100毫米且125亩厚的Kapton。渗透的NE-20的量与通过实验性不确定性内的理论计算获得的NE-20的数量同意。渗透的Ar-40的量作为背景中的少量，这也是一致的，即通过这些膜的计算量的Ar-40的数量是低于背景Ar-40的数量级。在本实验中，Ne-20 / Ar-40比率在渗透到30和60分钟后，Viton和200对于Kapton的viton和200的普遍大气比为1.8×10（3）。 Kapton表单有效增强NE-20 / Ar-40比率，并且能够测量NE同位素组成，而无需在行星勘探中的显着AR-40（++）干扰。假设火星大气压（7 HPA）和组合物（2.3ppm对于NE-20和AR-40的1.9％），计算通过Kapton渗透的NE-20和Ar-40的量。 NE-20 / AR-40比率可以增加到CA. 1使用75 mu m厚的kapton，持续时间为30-60分钟，其中Ar-40（++）的贡献约为Ne-20（+）的10％，并且AR-40之后的不确定性（+ +）校正估计为几倍。如果假设本研究中使用的QMS的灵敏度，则需要有效面积为50cm（2）。

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  • 来源
    《Planetary and space science》 |2020年第11期|105046.1-105046.11|共11页
  • 作者

    Miura Yayoi N.; Okuno Mamoru; Cho Yuichiro; Yoshioka Kazuo; Sugita Seiji;

  • 作者单位

    Univ Tokyo Earthquake Res Inst Bunkyo Ku 1-1-1 Yayoi Tokyo 1130032 Japan;

    Univ Tokyo Grad Sch Sci Dept Earth & Planetary Sci Bunkyo Ku 7-3-1 Hongo Tokyo 1130033 Japan;

    Univ Tokyo Grad Sch Sci Dept Earth & Planetary Sci Bunkyo Ku 7-3-1 Hongo Tokyo 1130033 Japan;

    Univ Tokyo Grad Sch Sci Dept Earth & Planetary Sci Bunkyo Ku 7-3-1 Hongo Tokyo 1130033 Japan|Grad Sch Frontier Sci Dept Complex Sci & Engn 5-1-5 Kashiwanoha Kashiwa Chiba 2778561 Japan;

    Univ Tokyo Grad Sch Sci Dept Earth & Planetary Sci Bunkyo Ku 7-3-1 Hongo Tokyo 1130033 Japan;

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  • 正文语种 eng
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  • 关键词

    Planetary mission; Martian atmosphere; Ne isotope; Permeation; Viton; Kapton;

    机译：行星使命;火星氛围;NE同位素;渗透;viton;kapton;

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