Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ccdt.symp....4f&link_type=abstract
In its Proc.: Symp. on Charge-Coupled Device Technol. for Sci. Imaging Appl. p 4-13 (SEE N75-28824 19-70)
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Charge Coupled Devices, Shadowgraph Photography, X Ray Sources, Equipment Specifications, Image Intensifiers, Photoelectrons, Radiation Detectors
Scientific paper
A new technique has been developed to locate strong, transient X-ray sources such as the recently discovered gamma ray bursts. The instrument, termed a shadowgraph, locates sources by detecting the X-ray shadow cast by a large occulting mask pattern on an imaging detector. Angular resolutions of from 2 to 10 arc minutes are obtainable while essentially full sky coverage is maintained. The optimum energy range of operation is between 20 keV and 100 keV. The high efficiency X-ray imaging detectors, which make it possible to locate bursts with intensities down to approximately 10 photons/sq cm sec, are capable of detecting single 20 keV photons with a spatial resolution of approximately 0.2 mm. The detectors consist of an X-ray to optical conversion phosphor, a multistage image intensifier, and a CCD image readout.
Fishman Gerald J.
Gregory John C.
Parnell Thomas A.
Rygg T. A.
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