Strontium Iodide Radiation Instrumentation (SIRI)

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

doi:10.1117/12.2272606

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29 August 2017 Strontium Iodide Radiation Instrumentation (SIRI)

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

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Proceedings Volume 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX; 103970B (2017) https://doi.org/10.1117/12.2272606
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

The Strontium Iodide Radiation Instrumentation (SIRI) is designed to space-qualify new gamma-ray detector technology for space-based astrophysical and defense applications. This new technology offers improved energy resolution, lower power consumption and reduced size compared to similar systems. The SIRI instrument consists of a single europiumdoped strontium iodide (SrI₂:Eu) scintillation detector. The crystal has an energy resolution of 3% at 662 keV compared to the 6.5% of traditional sodium iodide and was developed for terrestrial-based weapons of mass destruction (WMD) detection. SIRI’s objective is to study the internal activation of the SrI₂:Eu material and measure the performance of the silicon photomultiplier (SiPM) readouts over a 1-year mission. The combined detector and readout measure the gammaray spectrum over the energy range of 0.04 - 4 MeV. The SIRI mission payoff is a space-qualified compact, highsensitivity gamma-ray spectrometer with improved energy resolution relative to previous sensors. Scientific applications in solar physics and astrophysics include solar flares, Gamma Ray Bursts, novae, supernovae, and the synthesis of the elements. Department of Defense (DoD) and security applications are also possible. Construction of the SIRI instrument has been completed, and it is currently awaiting integration onto the spacecraft. The expected launch date is May 2018 onboard STPSat-5. This work discusses the objectives, design details and the STPSat-5 mission concept of operations of the SIRI spectrometer.

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Lee J. Mitchell, Bernard F. Phlips, Richard S. Woolf, Theodore T. Finne, W. Neil Johnson, and Emily G. Jackson "Strontium Iodide Radiation Instrumentation (SIRI)", Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 103970B (29 August 2017); https://doi.org/10.1117/12.2272606

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