Crystal growth and characterization of high performance KSr2BrxI5-x:Eu scintillators

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

doi:10.1016/j.jcrysgro.2019.125213

Title: Crystal growth and characterization of high performance KSr₂Br_xI_5-x:Eu scintillators

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Abstract

In this work we investigated the effects of replacing some of the matrix iodine atoms in KSr₂I₅:Eu with bromine, forming new solid solutions of KSr₂Br_xI_(5-x):Eu (where 0.05 ≤ x ≤ 1). Transparent 15 and 22mm diameter single crystals of KSr₂Br_xI_(5-x):Eu were grown via the vertical Bridgman technique using a two-zone transparent furnace. The scintillation properties of the mixed compounds were investigated and compared to the non-mixed parent compound, KSr₂I₅:Eu. The addition of bromine blue-shifted the x-ray excited emission from 450 to 446 nm, increased the light yield by ~11% and decreased the scintillation decay time by suppressing its secondary component (≥3 μs), while maintaining energy resolutions comparable to the reference crystal. Thermoluminescence glow curves showed that the addition of bromine modified the shallow traps located between 25 and 55 K, suggesting that these traps are responsible for lengthening KSI’s decay time. In large sizes (10.3 cm³), KSr₂Br_0.10I_4.90:Eu 2% had light yields up to 79,000 ph/MeV and energy resolutions as low as 3.2% at 662 keV.

Authors:

Stand, L. ^[1]; Zhuravleva, M. ^[2]; Johnson, J. ^[2]; Koschan, M. ^[1]; Loyd, M. ^[2]; Wu, Y. ^[1]; Lukosi, E. ^[3]; Melcher, C. L. ^[4]

Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center
Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center; Univ. of Tennessee, Knoxville, TN (United States). Materials Science and Engineering
Univ. of Tennessee, Knoxville, TN (United States). Nuclear Engineering
Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center; Univ. of Tennessee, Knoxville, TN (United States). Materials Science and Engineering; Univ. of Tennessee, Knoxville, TN (United States). Nuclear Engineering

Publication Date:: Fri Nov 15 00:00:00 EST 2019

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

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); US Department of Homeland Security (DHS)

OSTI Identifier:: 1565959

Alternate Identifier(s):: OSTI ID: 1775942

Grant/Contract Number:: NA0003180; NA0000979; 2014-DN-077-ARI088-03

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Crystal Growth

Additional Journal Information:: Journal Volume: 526; Journal Issue: C; Journal ID: ISSN 0022-0248

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; solid solutions; Bridgman technique; single crystal growth; halides; inorganic compounds; scintillator materials

Citation Formats


                    Stand, L., Zhuravleva, M., Johnson, J., Koschan, M., Loyd, M., Wu, Y., Lukosi, E., and Melcher, C. L. Crystal growth and characterization of high performance KSr2BrxI5-x:Eu scintillators.  United States: N. p., 2019. 
Web.  doi:10.1016/j.jcrysgro.2019.125213.

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                    Stand, L., Zhuravleva, M., Johnson, J., Koschan, M., Loyd, M., Wu, Y., Lukosi, E., & Melcher, C. L. Crystal growth and characterization of high performance KSr2BrxI5-x:Eu scintillators.  United States.  https://doi.org/10.1016/j.jcrysgro.2019.125213

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                    Stand, L., Zhuravleva, M., Johnson, J., Koschan, M., Loyd, M., Wu, Y., Lukosi, E., and Melcher, C. L. Fri .  
"Crystal growth and characterization of high performance KSr2BrxI5-x:Eu scintillators".  United States.  https://doi.org/10.1016/j.jcrysgro.2019.125213.  https://www.osti.gov/servlets/purl/1565959.

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@article{osti_1565959,

  title        = {Crystal growth and characterization of high performance KSr2BrxI5-x:Eu scintillators},

  author       = {Stand, L. and Zhuravleva, M. and Johnson, J. and Koschan, M. and Loyd, M. and Wu, Y. and Lukosi, E. and Melcher, C. L.},

  abstractNote = {In this work we investigated the effects of replacing some of the matrix iodine atoms in KSr2I5:Eu with bromine, forming new solid solutions of KSr2BrxI(5-x):Eu (where 0.05 ≤ x ≤ 1). Transparent 15 and 22mm diameter single crystals of KSr2BrxI(5-x):Eu were grown via the vertical Bridgman technique using a two-zone transparent furnace. The scintillation properties of the mixed compounds were investigated and compared to the non-mixed parent compound, KSr2I5:Eu. The addition of bromine blue-shifted the x-ray excited emission from 450 to 446 nm, increased the light yield by ~11% and decreased the scintillation decay time by suppressing its secondary component (≥3 μs), while maintaining energy resolutions comparable to the reference crystal. Thermoluminescence glow curves showed that the addition of bromine modified the shallow traps located between 25 and 55 K, suggesting that these traps are responsible for lengthening KSI’s decay time. In large sizes (10.3 cm3), KSr2Br0.10I4.90:Eu 2% had light yields up to 79,000 ph/MeV and energy resolutions as low as 3.2% at 662 keV.},

  doi          = {10.1016/j.jcrysgro.2019.125213},

  journal      = {Journal of Crystal Growth},

  number       = C,

  volume       = 526,

  place        = {United States},

  year         = {Fri Nov 15 00:00:00 EST 2019},

  month        = {Fri Nov 15 00:00:00 EST 2019}

}

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Title: Crystal growth and characterization of high performance KSr2BrxI5-x:Eu scintillators

Abstract

Citation Formats

Title: Crystal growth and characterization of high performance KSr₂Br_xI_5-x:Eu scintillators