Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1743..245v&link_type=abstract
In: EUV, X-ray, and gamma-ray instrumentation for astronomy III; Proceedings of the Meeting, San Diego, CA, July 22-24, 1992 (A9
Astronomy and Astrophysics
Astronomy
Corrosion Resistance, Radiation Hardening, Spaceborne Astronomy, Windows (Apertures), X Ray Detectors, X Ray Telescopes, Absorptivity, Cobalt 60, Oxygen Atoms
Scientific paper
Several types of ultrathin entrance windows have been developed for applications in spaceborne X-ray instruments. Active area diameters up to 140 mm have been achieved. The latest windows developed have a transmission of more than 20 percent at B K-alpha and more than 40 percent at N K-alpha. A new gas block layer type utilizing aluminum nitride has been developed, as well as semitransparent support structures for the membranes. The effects of pressure-induced strain, radiation and atomic oxygen corrosion on the gas leak properties of the windows has been studied.
Mutikainen Risto
Nenonen Seppo
Partanen Panu
Sipila Heikki
Viitanen Veli-Pekka
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