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Proceedings Paper

Development of the strontium iodide coded aperture (SICA) instrument
Author(s): Lee J. Mitchell; Bernard F. Phlips; J. Eric Grove; Ryan Cordes
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Paper Abstract

The work reports on the development of a Strontium Iodide Coded Aperture (SICA) instrument for use in space-based astrophysics, solar physics, and high-energy atmospheric physics. The Naval Research Laboratory is developing a prototype coded aperture imager that will consist of an 8 x 8 array of SrI2:Eu detectors, each read out by a silicon photomultiplier. The array would be used to demonstrate SrI2:Eu detector performance for space-based missions. Europium-doped strontium iodide (SrI2:Eu) detectors have recently become available, and the material is a strong candidate to replace existing detector technology currently used for space-based gamma-ray astrophysics research. The detectors have a typical energy resolution of 3.2% at 662 keV, a significant improvement over the 6.5% energy resolution of thallium-doped sodium iodide. With a density of 4.59 g/cm and a Zeff of 49, SrI2:Eu has a high efficiency for MeV gamma-ray detection. Coupling this with recent improvements in silicon photomultiplier technology (i.e., no bulky photomultiplier tubes) creates high-density, large-area, low-power detector arrays with good energy resolution. Also, the energy resolution of SrI2:Eu makes it ideal for use as the back plane of a Compton telescope.

Paper Details

Date Published: 24 August 2015
PDF: 12 pages
Proc. SPIE 9601, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX, 96010A (24 August 2015); doi: 10.1117/12.2195575
Show Author Affiliations
Lee J. Mitchell, U.S. Naval Research Lab. (United States)
Bernard F. Phlips, U.S. Naval Research Lab. (United States)
J. Eric Grove, U.S. Naval Research Lab. (United States)
Ryan Cordes, Praxis Inc. (United States)

Published in SPIE Proceedings Vol. 9601:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX
Oswald H. Siegmund, Editor(s)

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