A Comprehensive Hard X-/Soft Gamma-ray Imaging Syst. for Astro. using APD Arrays
Small Business Information
44 Hunt Street, Watertown, MA, 02472
Gerald Entine, Ph.D.
AbstractA critically important region of the electromagnetic spectrum is the hard X-ray/soft gamma-ray band from 10 KeV to a few MeVs. In this band, a wealth of astrophysical processes occur in an even greater diversity of astrophysical objects and phenomena, both on a compact and diffuse scale. Surprisingly, for such a pivotal region of the spectrum, the high energy sky is still quite unexplored in that the number of sources detected is still too small to allow a comprehensive study of the various phenomena involved. An instrument used for planetary scientific investigations is an X-ray/ gamma-ray spectrometer; it must be lightweight, stable, reliable, rugged, and long-lived. Radiation Monitoring Devices, Inc. (RMD) proposes to develop an innovative detector with a matrix of CsI(Tl) scintillators coupled to an array of avalanche photodiodes (APDs). Such a detector can be integrated into an imaging spectrometer to achieve improved angular resolution using a shadow-casting technique with the use of one or two-coded apertures. The improved angular resolution in the hard X-ray and gamma-ray regime will enable the studying of spatial and temporal development of solar flares, repeating gamma-ray bursters, and hard X-ray transients.
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