Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..808s&link_type=abstract
Nature, vol. 287, Oct. 30, 1980, p. 808-810. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astronomy
1
Electron Avalanche, Imaging Techniques, Proportional Counters, X Ray Astronomy, Background Radiation, Cobalt 60, Focal Plane Devices, Gamma Rays, Time Response
Scientific paper
The parallel plate imaging proportional counter was developed to register images of cosmic X-ray sources in the focal planes of X-ray telescopes. An important factor determining the sensitivity of such an instrument, particularly for extended source studies, is the background count rate induced in the detector by the interaction of charged particles such as cosmic rays. This background in wire anode proportional counters can be reduced by applying risetime discrimination to the charge pulse. A modified version of the parallel plate imaging proportional counter has been constructed to investigate the application of risetime discrimination to the scintillation pulses caused by the electron avalanche process. It is shown that efficient background event rejection (greater than 90%) is achieved, and an application of this system for X-ray astronomy is discussed.
Cockshott R.
Culhane Leonard J.
Mason I. M.
Sanford Peter W.
Siegmund Oswald H. W.
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