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15 October 1997 New type of imaging x-ray detector using a capillary plate
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We constructed an optical imaging x-ray detector with a capillary gas proportional counter (CGPC), a focusing mirror system, and an image intensified CCD camera. The CGPC consists of an absorption region for x-rays, which also operates as a drift region of electron clouds, and a gas proportional scintillation region in a capillary plate. With a gas mixture of Xe plus 2% CH4 at 1 atm and a gas gain 8000, the light output from the CGPC is several tens thousand times larger than that of a typical NaI(Tl) scintillator and it is enough to image electron clouds due to a few tens keV x rays. To investigate the imaging ability, images for tracks due to (alpha) particles (241Am) of 5.5 MeV were taken in the gas mixture of Xe plus CH4, for the several reduced fields in the drift region. We confirmed that the images were most clearly observed at around the reduced fields of 40 V/cm(DOT)atm.
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Hirohisa Sakurai, S. Saito, Motosaku Noma, Shuichi Gunji, Makiko Tsukahara, and Tsutomu Tamura "New type of imaging x-ray detector using a capillary plate", Proc. SPIE 3114, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VIII, (15 October 1997);

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