Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.300..509f&link_type=abstract
Nature, vol. 300, Dec. 9, 1982, p. 509-511. Research supported by the Science and Engineering Research Council.
Astronomy and Astrophysics
Astronomy
15
Microchannel Plates, Radiation Detectors, System Effectiveness, X Ray Astronomy, Cameras, Magnesium Fluorides, Rosat Mission, Satellite-Borne Instruments, Spaceborne Telescopes
Scientific paper
Although the microchannel plate (MCP) electron multipliers used in X-ray astronomy facilitate X-ray imaging with high spatial resolution, their intrinsic soft X-ray detection efficiencies of 1-10 percent are much lower than the near-unity values available with competing gas proportional counters. A high photoelectric yield material may be deposited on the MCP front surface and channel walls in order to enhance X-ray sensitivity at energies below a few keV. High 0.18-1.5 keV X-ray detection efficiencies are reported for MCPs bearing CsI deposition photocathodes, by which efficiency enhancement factors of up to 15 have been obtained. These results are especially pertinent to the sensitivity of such future X-ray astronomy experiments as the Roentgensatellit (Rosat) Wide Field Camera.
Barstow Martin Adrian
Fraser George W.
Wells Alan A.
Whiteley M. J.
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