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Proceedings Paper

Strontium iodide radiation instrumentation II (SIRI-2)
Author(s): Lee J. Mitchell; Bernard F. Phlips; Richard S. Woolf; Theodore T. Finne; W. Neil Johnson
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Paper Abstract

The SIRI line of instruments is designed to space-qualify new space-based, gamma-ray detector technology for Department of Defense (DoD) and astrophysics applications. SIRI-2’s primary objective is to demonstrate the performance of europium-doped strontium iodide (SrI2:Eu) gamma-ray detection technology with sufficient active area for DoD operational needs. Secondary scientific objectives include understanding the internal background of SrI2:Eu in the space radiation environment, and studying transient phenomena, such as solar flares. The primary detector array of the SIRI instrument consists of seven hexagonal europium-doped strontium iodide (SrI2:Eu) scintillation detectors 3.81 cm by 3.81 cm, with a combined active area of 66 cm2. SIRI-2’s primary detectors have an energy resolution of ~4% at 662 keV. SIRI-2 is expected to operate in the high gamma-ray background of a geosynchronous orbit and the instrument includes a number of features to both passively and actively suppress the unique background of the outer Van Allen belts. Construction and environmental testing of the SIRI-2 instrument has been completed, and it is currently awaiting integration onto the spacecraft bus. The expected launch date is Aug 2020 onboard the Space Test Program’s STPSat-6.

Paper Details

Date Published: 9 September 2019
PDF: 18 pages
Proc. SPIE 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI, 111180I (9 September 2019); doi: 10.1117/12.2528073
Show Author Affiliations
Lee J. Mitchell, U.S. Naval Research Lab. (United States)
Bernard F. Phlips, U.S. Naval Research Lab. (United States)
Richard S. Woolf, U.S. Naval Research Lab. (United States)
Theodore T. Finne, U.S. Naval Research Lab. (United States)
W. Neil Johnson, Praxis, Inc. (United States)

Published in SPIE Proceedings Vol. 11118:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI
Oswald H. Siegmund, Editor(s)

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