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Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants Volume 2 (1996) / Chapter Skim
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Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants
Pages 1-6

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From page 1...
... Several hundred chemical contaminants are likely to be found in the closed-Ioop atmosphere of the space station, most at very low concentrations. Important sources of atmospheric contaminants include off-gassing of cabin materials, operation of equipment, and metabolic waste products of crew members.
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From page 2...
... , have not promulgated exposure limits for the unique environment of spacecraft, nor are their existing standards appropriate for this environment. in 1972, the National Research CounciT's Committee on Toxicology (COT)
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From page 3...
... That report provided guidance for deriving SMACs from available toxicological and epidemiological data. It also provided guidance on what data to use, how to evaluate the data for appropriateness, how to perform risk assessment for carcinogenic and noncarcinogenic effects, and how to consider the effects of physiological changes induced by microgravity that might enhance the susceptibility of astronauts to certain spacecraft contaminants.
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From page 4...
... When a substance is known to cause an effect that will be aggravated by microgravity, additional safety factors are used. REVIEW OF SMAC REPORTS In the second phase of the study, the Subcommittee on Spacecraft Maximum Allowable Concentrations reviewed reports for approximately 35 spacecraft contaminants to determine whether the recommended exposure limits were consistent with the 1992 guidelines (see Appendix A)
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From page 5...
... Washington, D.C.: National Academy of Sciences. NRC (National Research Council)
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From page 6...
... Washington, D.C.: National Academy Press. NRC (National Research Council)
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Key Terms

  • allowable concentrations
  • spacecraft maximum
  • maximum allowable
  • spacecraft contaminants
  • airborne contaminants

  • space station
  • selected airborne
  • continuous exposure
  • toxicity data
  • exposure limits

  • developing spacecraft
  • guidance levels
  • exposure guidance
  • station contaminants
  • toxicity studies

  • recommended exposure
  • contains smac
  • establish guidelines
  • chemical contaminants
  • emergency exposures

  • nasa scientists
  • hundred chemical
  • decremental change
  • chemical substances
  • smac documents

  • toxic chemicals
  • subsequent volumes
  • nasa requested
  • human clinical
  • preparing smacs


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