Relevant to this question. NASA says the very thin vacuum like Lunar atmosphere has sodium and potassium Does creating a very thin vacuum like lunar atmosphere of the metal atoms leftover after mining for water and helium-3 make sense?
As the lunar atmosphere would be very thin, very light atoms such as proton and alpha particle would penetrate but high energy ions from cosmic ray would be shielded because they would bounce off those silicon atoms?
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New question: How about a Krypton or Xenon atmosphere?
physical properties of krypton, physical properties of xenon