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Changes in the Optical Properties of Simulated Shuttle Waste Water Deposits- Urine DarkeningManned spacecraft have historically dumped the crew generated waste waster overboard, into the environment in which the spacecraft operates, sometimes depositing the waste water on the external spacecraft surfaces. The change in optical properties of wastewater deposited on spacecraft external surfaces, from exposure to space environmental effects, is not well understood. This study used nonvolatile residue (NVR) from Human Urine to simulate wastewater deposits and documents the changes in the optical properties of the NVR deposits after exposure to ultra violet (UV) radiation. Twenty NVR samples of, 0-angstromes/sq cm to 1000-angstromes/sq cm, and one sample contaminated with 1 to 2-mg/sq cm were exposed to UV radiation over the course of approximately 6151 equivalent sun hours (ESH). Random changes in sample mass, NVR, solar absorbance, and infrared emission were observed during the study. Significant changes in the UV transmittance were observed for one sample contaminated at the mg/sq cm level.
Document ID
Document Type
Preprint (Draft being sent to journal)
Albyn, Keith (NASA Marshall Space Flight Center Huntsville, AL, United States)
Edwards, David (NASA Marshall Space Flight Center Huntsville, AL, United States)
Alred, John (Boeing Co. Houston, TX, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Environment Pollution
Distribution Limits
Work of the US Gov. Public Use Permitted.