On-orbit results of the GAGG radiation instruments

Lee J. Mitchell; Bernard F. Phlips; Richard S. Woolf; Anthony L. Hutcheson; Wiley N. Johnson; Mary Johnson-Rambert

doi:10.1117/12.2672563

5 October 2023 On-orbit results of the GAGG radiation instruments

Lee J. Mitchell, Bernard F. Phlips, Richard S. Woolf, Anthony L. Hutcheson, Wiley N. Johnson, Mary Johnson-Rambert

Proceedings Volume 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII; 1267815 (2023) https://doi.org/10.1117/12.2672563
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The GAGG Radiation Instrument (GARI) is designed to space-qualify a compact, high-sensitivity gamma-ray spectrometer for astrophysical and defense applications and has completed over one year of operations on the International Space Station (ISS). The on-orbit activation of the GAGG crystal induced by the radiation background was measured. Characteristic gamma-ray lines present in the on-orbit spectra were compared to ground-based tests for identification. The radiation background, including the particle-induced internal activation of the crystal, affects the sensitivity of the instrument. We also show the degradation in the performance of the silicon photomultiplier (SiPM) readout (known to be sensitive to radiation damage). Results shown here will be useful in predicting the performance of larger instruments that use GAGG scintillator technology for gamma-ray spectroscopy.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lee J. Mitchell, Bernard F. Phlips, Richard S. Woolf, Anthony L. Hutcheson, Wiley N. Johnson, and Mary Johnson-Rambert "On-orbit results of the GAGG radiation instruments", Proc. SPIE 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII, 1267815 (5 October 2023); https://doi.org/10.1117/12.2672563

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