Strontium iodide radiation instrumentation II (SIRI-2)

Lee J. Mitchell; Bernard F. Phlips; Richard S. Woolf; Theodore T. Finne; W. Neil Johnson

doi:10.1117/12.2528073

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9 September 2019 Strontium iodide radiation instrumentation II (SIRI-2)

Lee J. Mitchell, Bernard F. Phlips, Richard S. Woolf, Theodore T. Finne, W. Neil Johnson

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Proceedings Volume 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI; 111180I (2019) https://doi.org/10.1117/12.2528073
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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.

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Lee J. Mitchell, Bernard F. Phlips, Richard S. Woolf, Theodore T. Finne, and W. Neil Johnson "Strontium iodide radiation instrumentation II (SIRI-2)", Proc. SPIE 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI, 111180I (9 September 2019); https://doi.org/10.1117/12.2528073

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