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- W2087528183 abstract "Because particles of sizes larger than a few tenths microns adversely affect hight resolution X-ray telescopes by scattering and absorbing X-rays, we are investigating the clean-liness required to maintain the ~1% overall calibration precision desired for the Advanced X-ray Astrophysics Facility (AXAF). At the grazing angles used for the AXAF mirrors, each particle shadows a surface area ~ 10<sup>2</sup> times its geometric area, necessitating glass occlusion specifications much more stringent than typically stipulated for visible-light particulate contamination. On test fiats coated with gold, we have deposited controlled levels of contamination spanning the range from 5 x 10<sup>-5</sup> to 5 x 10<sup>-3</sup> fractional area covered and have measured the absorption component of extinction over a range of grazing angles and X-ray energies to verify the predicted effects of particulate contamination. Further tests are planned to examine a wider range of energies and to take into account sample flatness and distortions introduced by holding fixtures." @default.
- W2087528183 created "2016-06-24" @default.
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- W2087528183 date "1989-10-11" @default.
- W2087528183 modified "2023-09-27" @default.
- W2087528183 title "Measurement Of The Effects Of Particulate Contamination On X-Ray Reflectivity" @default.
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- W2087528183 doi "https://doi.org/10.1117/12.955568" @default.
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