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Title: Crystal growth and characterization of high performance KSr 2Br xI 5−x:Eu scintillators

Abstract

In this work we investigated the effects of replacing some of the matrix iodine atoms in KSr 2I 5:Eu with bromine, forming new solid solutions of KSr 2Br xI (5-x):Eu (where 0.05 ≤ x ≤ 1). Transparent 15 and 22mm diameter single crystals of KSr 2Br 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, KSr 2I 5: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 cm 3), KSr 2Br 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:
 [1];  [2];  [2];  [1];  [2];  [1];  [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center
  2. Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center; Univ. of Tennessee, Knoxville, TN (United States). Materials Science and Engineering
  3. Univ. of Tennessee, Knoxville, TN (United States). Nuclear Engineering
  4. 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:
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
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.
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. doi:10.1016/j.jcrysgro.2019.125213.
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. doi:10.1016/j.jcrysgro.2019.125213.
@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 = {2019},
month = {11}
}

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This content will become publicly available on November 15, 2020
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