Definition
For planetary protection, the cleanliness of an environment or spacecraft hardware is the level of contamination by something which is not wanted for the achievement of a goal. The maximum amount of the unwanted item is generally specified. For instance, the biological cleanliness can be measured by the number of remaining microorganisms after the cleaning process. Depending on the final goal, the living microorganisms, the dead microorganisms, or both could be considered. The chemical cleanliness refers to maximal specified amounts of each chemical per unit of surface or volume.
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© 2014 Springer-Verlag Berlin Heidelberg
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Conley, C.A. (2014). Cleanliness. In: Amils, R., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27833-4_304-2
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DOI: https://doi.org/10.1007/978-3-642-27833-4_304-2
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Publisher Name: Springer, Berlin, Heidelberg
Online ISBN: 978-3-642-27833-4
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