Temporal Variations of 222Rn Density Distributions in the Lunar Exosphere

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-08-27 DOI:10.3847/psj/ad698e
Ian-Lin Lai, Wing-Huen Ip
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Abstract

Because of radiogenic processes, the lunar interior is a source of rare gases like helium (4He), argon (40Ar), and radon (222Rn) that might be released continuously, or impulsively during moonquakes. The detection of radon is therefore important in the sense that it can help trace the crustal dynamics on the Moon. In this study, we will introduce a Monte Carlo–based model designed to investigate the time-dependent transient dynamics of the lunar 222Rn exosphere. Our model accounts for the background emission and transient ejection of gas molecules from the lunar surface, encompassing loss processes such as radioactive decay, photoionization, and the cold trapping in permanently shadowed regions near the poles. Additionally, it incorporates the diurnal temperature fluctuations of the lunar surface, which significantly influence the condensation duration of the radon atoms and their subsequent release near the sunrise. This model also can support future observations in missions such as Chang’E 6 or other lunar explorations.
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月球外大气层中 222Rn 密度分布的时间变化
由于辐射生成过程,月球内部是氦气(4He)、氩气(40Ar)和氡气(222Rn)等稀有气体的来源,这些气体可能持续释放,也可能在月震期间脉冲式释放。因此,对氡的探测非常重要,因为它有助于追踪月球的地壳动态。在本研究中,我们将介绍一个基于蒙特卡罗的模型,旨在研究月球 222Rn 外大气层随时间变化的瞬态动力学。我们的模型考虑了本底辐射和月球表面气体分子的瞬时喷射,包括放射性衰变、光离子化和两极附近永久阴影区的冷阱等损耗过程。此外,该模型还纳入了月球表面的昼夜温度波动,这对氡原子的凝结持续时间及其随后在日出附近的释放有重大影响。该模型还可为嫦娥六号等飞行任务或其他月球探测中的未来观测提供支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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