Preventing the Forward Contamination of Europa (2000) / Chapter Skim
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4 Sterilization and Cleaning Methods
4 Sterilization and Cleaning Methods
Pages 17-19
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From page 17... ...
For complex scientific missions, therefore, whole-spacecraft sterilization is not an option a single sterilization procedure would be limited by the spacecraft's most sensitive component. As a result of this constraint, many spacecraft components are sterilized individually and then assembled in clean rooms using rigorous procedures that minimize recontamination.
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From page 18... ...
5,000 to 20,000 J/m2—Problems arise because unexposed surfaces remain untreated. Toxic gas Problems can be encountered because unexposed surfaces remain untreated and because the gas catalyzes chemical reactions between metal and other components.
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From page 19... ...
Latex gloves are worn in the clean room, and spacecraft are not seeded with tracer organisms to facilitate monitoring; · Cameras are used to observe and monitor assembly; · Clean-room air passes through high efficiency particulate air (HEPA) filters and dehumidifiers to minimize airborne microbial contamination and corrosion, respectively; Surface particles are removed by vacuuming; Witness plates are regularly collected and stored; Contact between hardware and biologically relevant materials is minimized; and Surface areas of the spacecraft are monitored periodically for their microbiological burden, during and after assembly.
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