1 October 1991 One-dimensional proportional counters for x-ray all-sky monitors
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The X-ray detection system used to calibrate the Advanced X-ray Astrophysics Facility (AXAF) mirrors will include gas flow and sealed proportional counters. To meet the ultimate 1 percent goal of the calibration project, the transmission and uniformity of the windows must be well known for the soft X-ray wavelengths involved. Various window materials for use with proportional counters are examined for transmission at X-ray wavelengths in the range of 0.1 to 5.9 keV. These include the usual window materials (polypropylene and beryllium), as well as materials only recently employed for detector applications (polyimide and diamond). The transmission uniformity of beryllium at 1.49 keV is examined with a microchannel plate detector, producing a 'shadowgraph' of the window material illuminated with soft X-rays. This technique allows us to investigate nonuniformities on a spatial scale of about .2 mm.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Masaru Matsuoka, Masaru Matsuoka, Masamitsu Yamauchi, Masamitsu Yamauchi, Haruo Nakamura, Haruo Nakamura, M. Kondo, M. Kondo, Nobuyuki Kawai, Nobuyuki Kawai, Atsumasa Yoshida, Atsumasa Yoshida, Tohru Imai, Tohru Imai, } "One-dimensional proportional counters for x-ray all-sky monitors", Proc. SPIE 1549, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy II, (1 October 1991); doi: 10.1117/12.48321; https://doi.org/10.1117/12.48321


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