Gamma-ray spectroscopic characterization of long, rapidly-grown KSr2I5:Eu crystals

Stand, L.; Zhuravleva, M.; Johnson, J.; Koschan, M.; Lukosi, E.; Melcher, C. L.

doi:10.1016/j.nima.2020.163700

Gamma-ray spectroscopic characterization of long, rapidly-grown KSr₂I₅:Eu crystals

Journal Article · Thu Feb 27 00:00:00 EST 2020 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2020.163700· OSTI ID:1602438

Stand, L. ^[1]; Zhuravleva, M. ^[2]; Johnson, J. ^[2]; Koschan, M. ^[2]; Lukosi, E. ^[2]; Melcher, C. L. ^[2]

Univ. of Tennessee, Knoxville, TN (United States); University of Tennessee
Univ. of Tennessee, Knoxville, TN (United States)

Collimation and volumetric studies were done to evaluate the gamma-ray spectroscopic performance of KSr₂I₅:Eu scintillators grown via the vertical Bridgman method. To demonstrate practical crystal growth for large-scale production, Ø1 in. × 6 in. long crystals were grown using fast pulling rates up to 5 mm/h and short cooling times. The long crystals were sectioned into shorter Ø1 in. cylinders to investigate sample-to-sample variation of scintillation properties, the effects of self-absorption and scintillation non-uniformity using different gamma-ray excitation configurations. The best light output and energy resolution achieved for the largest volume and aspect ratio crystals (60 cm³ Ø1 in x 4.7 in. long) were 53,500 ph/MeV and 4.6% at 662 keV. Finally, we produced eight Ø1 in. × 1 in. (12.5 cm³) cylindrical samples, four from each boule, with energy resolutions between 3.1%-3.5% at 662 keV.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: US Department of Homeland Security (DHS); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)

Grant/Contract Number:: NA0000979; NA0003180

OSTI ID:: 1602438

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 962; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Gamma-ray spectroscopic characterization of long, rapidly-grown KSr₂I₅:Eu crystals