Evaluation of GAGG: Ce scintillators for future space applications

M. Yoneyama, Jun Kataoka, M. Arimoto, T. Masuda, M. Yoshino, K. Kamada, A. Yoshikawa, H. Sato, Y. Usuki

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Cerium-doped Gd3(Ga, Al)5O12 (GAGG:Ce) is a promising novel scintillator for gamma-ray detectors. While GAGG:Ce has already been implemented in various commercial products, its detailed characteristics and response to high-energy particles and gamma rays remain unknown. In particular, knowledge is lacking on the radiation tolerance of this scintillator against the gamma-ray and proton irradiation expected in future space satellite mission applications. In this study, we first investigate the light-yield energy dependence, energy resolution, decay time, radiation tolerance, and afterglow of GAGG:Ce scintillators under various temperature conditions. We find excellent linearity of ±3% between light yields and deposited energy over a wide range of 30-1836 keV; however, a light-yield deficit of more than 10% is observed below 30 keV of deposited gamma ray energy. We confirm that the temperature dependence of the light yield, energy resolution, and scintillation decay time is within 5-20% between -20 and 20C. We also evaluate the GAGG:Ce activation characteristics under proton irradiation and the light-yield degradation by accumulated dose using a 60Co source. Moreover, we successfully identify various gamma-ray lines due to activation. Finally, we find a substantial afterglow for GAGG:Ce scintillators over a few hours; such an afterglow is only minimally observed in other scintillators such as CsI:Tl and Bi4Ge3O12 (BGO). However, the afterglow can be substantially reduced through additional co-doping with divalent metal ions, such as Mg ions. These results suggest that GAGG:Ce is a promising scintillator with potential application in space satellite missions in the near future.

    Original languageEnglish
    Article numberP02023
    JournalJournal of Instrumentation
    Volume13
    Issue number2
    DOIs
    Publication statusPublished - 2018 Feb 21

    Keywords

    • Gamma detectors (scintillators, CZT, HPG, HgI etc)
    • Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)
    • X-ray detectors

    ASJC Scopus subject areas

    • Instrumentation
    • Mathematical Physics

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  • Cite this

    Yoneyama, M., Kataoka, J., Arimoto, M., Masuda, T., Yoshino, M., Kamada, K., Yoshikawa, A., Sato, H., & Usuki, Y. (2018). Evaluation of GAGG: Ce scintillators for future space applications. Journal of Instrumentation, 13(2), [P02023]. https://doi.org/10.1088/1748-0221/13/02/P02023