Intrinsic scintillation performance & europium concentration effects in RbSr2I5 and RbSr2Br5 scintillators

Pestovich, Kimberly S.; Stand, Luis; Anastasi, Nicholas; Gillespie, Megan A.; Pandian, Lakshmi S.; Melcher, Charles L.; Loef, Edgar van; Zhuravleva, Mariya

doi:10.1016/j.jcrysgro.2024.127924

Title: Intrinsic scintillation performance & europium concentration effects in RbSr₂I₅ and RbSr₂Br₅ scintillators

Journal Article · 09 October 2024 · Journal of Crystal Growth

DOI: https://doi.org/10.1016/j.jcrysgro.2024.127924 · OSTI ID:2461593

Pestovich, Kimberly S. ^[1]; Stand, Luis ^[2]; Anastasi, Nicholas ^[3]; Gillespie, Megan A. ^[2]; Pandian, Lakshmi S. ^[3]; Melcher, Charles L. ^[2]; Loef, Edgar van ^[3]; Zhuravleva, Mariya ^[2]

University of Tennessee, Knoxville, TN (United States); University of Tennessee
University of Tennessee, Knoxville, TN (United States)
Radiation Monitoring Devices, Watertown, MA (United States)

Scintillators play crucial roles in homeland security applications like gamma ray spectroscopy and high energy X-ray radiography. For promising new scintillators, fine-tuning the luminescent dopant concentration is one avenue to further improve their performance and tailor their properties. In this work, the effects of europium dopant concentrations on the crystal growth, luminescence and scintillation properties of RbSr₂Br₅ and RbSr₂I₅ crystals was investigated. Nine transparent 7 mm diameter single crystals were grown via the Vertical Bridgman method. Here, the optical band gap of RbSr₂Br₅ was 5.9 eV and that of RbSr₂I₅ was 4.7 eV. High scintillation performance was achieved with a relatively low europium concentration of 1 mol%. For both RbSr₂Br₅:Eu and RbSr₂I₅:Eu crystals, light yield of 60–90,000 ph/MeV, energy resolution 2.8–4.0 % at 662 keV, and X-ray afterglow 0.79–1.5 % at 2 ms were obtained.

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Research Organization:: Nuclear Science and Security Consortium, Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); U.S. Department of Homeland Security

Grant/Contract Number:: NA0003996

OSTI ID:: 2461593

Journal Information:: Journal of Crystal Growth, Journal Name: Journal of Crystal Growth Vol. 649; ISSN 0022-0248

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Intrinsic scintillation performance & europium concentration effects in RbSr2I5 and RbSr2Br5 scintillators

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Title: Intrinsic scintillation performance & europium concentration effects in RbSr₂I₅ and RbSr₂Br₅ scintillators