Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..525p&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
60
Exosat Satellite, Proportional Counters, Rare Gases, Satellite-Borne Instruments, Scintillation Counters, Spectrometers, Astronomical Spectroscopy, Cosmic X Rays, Helium, Iron, Line Spectra, Supernova Remnants, Systems Engineering, X Ray Sources
Scientific paper
In the counter, the electrons produced by the X-ray photoabsorption are drifted into a spherical high electric field region. Here they acquire energy sufficient to excite the noble gas atoms. These excited atoms form diatomic molecules through collisions, with UV photons in the waveband 1500-1950 A emitted. This burst of UV photons is subsequently observed by a photomultiplier tube, whose integrated anode signal has an amplitude proportional to the energy of the absorbed X-ray photon. The energy resolution depends on the variance in the number of UV photons observed by the photomultiplier tube as well as the variance in the initial number of electrons produced in the photoabsorption process. The energy resolution is approximately a factor of 2 better than the conventional proportional counter, being about 10 percent full-width-half-maximum at 6 keV.
Andresen R. D.
Ives J. C.
Kellock Steve
Manzo Giuseppe
Peacock Aaron
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