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Introduction
Pages 1-2

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From page 1...
... It is defined as a ceiling limit designed to avoid adverse health effects, either immediate or delayed, and to avoid degradation in crew performance that might endanger the objectives of a particular mission. Because human data on continuous exposures are rarely available, uncertainty factors might be used, the magnitude depending on the Judgment of the Committee.
From page 2...
... Washington, D.C.: National Academy of Sciences. 115 P ~ National Research Council, Committee on Toxicology.


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