The high-energy celestial X-ray instrument on board OSO-8

Details The high-energy celestial X-ray instrument on board OSO-8 The high-energy celestial X-ray instrument on board OSO-8

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ssi.....3..325d&link_type=abstract

Space Science Instrumentation, vol. 3, Nov. 1977, p. 325-342.

Astronomy and Astrophysics

Astronomy

14

Oso-8, Radiation Detectors, X Ray Astronomy, Cesium Iodides, Collimators, Compton Effect, Incident Radiation, Sodium

Scientific paper

The 20 keV-3 MeV celestial X-ray detector on the OSO-8 is described. The primary objectives of this instrument are to measure the energy spectrum of cosmic X-ray sources above 20 keV and to search for time variations, both periodic and irregular, in the intensity of the sources detected. The detector consists of two optically isolated central crystals shielded by a large, active collimator. The sensitive area is 27.5 sq cm and the field-of-view is 5 deg FWHM. The instrument is mounted in the wheel section of OSO-8 with the axis of its field of view offset by 5 deg from the negative spin axis of the wheel. The minimum detectable intensity of a point source which is brought to within 5 deg of the negative spin axis for greater than one day is about 10 to the minus fifth power photons/sq cm-sec at 100 keV.

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