1 January 1999 Gas permeability through thin-foil X-ray filters
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Optical Engineering, 38(1), (1999). doi:10.1117/1.602248
Abstract
We have measured the permeation rates of helium and water through thin-foil UV-blocking filters used in the ASTRO-E/X-Ray Spectrometer (XRS) instrument. In the XRS program, there is a concern that outgassed contaminants such as water could permeate through the outermost filter, which will be at room temperature, and freeze on the inner filters, which will be at cryogenic temperatures. The filters tested consisted of ~ 1000 A Al on ~ 1000 A of either Lexan or polyimide. Results discussed include the permeation rate as a function of pressure difference across a filter, the ratio of helium to water permeation rate, and the effect of the aluminum layer thickness on permeation.
June L. Tveekrem, Ritva A. M. Keski-Kuha, Andrew T. Webb, "Gas permeability through thin-foil X-ray filters," Optical Engineering 38(1), (1 January 1999). http://dx.doi.org/10.1117/1.602248
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KEYWORDS
Helium

Optical filters

Aluminum

Sensors

X-rays

Calibration

Neon

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