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Title: Bridgman Growth of Large SrI2:Eu2+ Single Crystals: A High-performance Scintillator for Radiation Detection Applications

Abstract

Single-crystal strontium iodide (SrI2) doped with relatively high levels (e.g., 3 - 6 %) of Eu2+ exhibits characteristics that make this material superior, in a number of respects, to other scintillators that are currently used for radiation detection. Specifically, SrI2:Eu2+ has a light yield that is significantly higher than LaBr3:Ce3+ -a currently employed commercial high-performance scintillator. Additionally, SrI2:Eu2+ is characterized by an energy resolution as high as 2.6% at the 137Cs gamma-ray energy of 662 keV, and there is no radioactive component in SrI2:Eu2+ - unlike LaBr3:Ce3+ that contains 138La. The Ce3+-doped LaBr3 decay time is, however, faster (30 nsec) than the 1.2 sec decay time of SrI2:Eu2+. Due to the relatively low melting point of strontium iodide (~515 oC), crystal growth can be carried out in quartz crucibles by the vertical Bridgman technique. Materials-processing and crystal-growth techniques that are specific to the Bridgman growth of europium-doped strontium iodide scintillators are described here. These techniques include the use of a porous quartz frit to physically filter the molten salt from a quartz antechamber into the Bridgman growth crucible and the use of a bent or bulb grain selector design to suppress multiple grain growth. Single crystals of SrI2:Eu2+ scintillators withmore » good optical quality and scintillation characteristics have been grown in sizes up to 5.0 cm in diameter by applying these techniques. Other aspects of the SrI2:Eu2+ crystal-growth methods and of the still unresolved crystal-growth issues are described here.« less

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [3]
  1. ORNL
  2. Radiation Monitoring Devices, Watertown, MA
  3. Fisk University, Nashville, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
1089231
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Crystal Growth
Additional Journal Information:
Journal Volume: 379; Journal ID: ISSN 0022-0248
Country of Publication:
United States
Language:
English

Citation Formats

Boatner, Lynn A, Ramey, Joanne Oxendine, Kolopus, James A, Hawrami, Rastgo, Higgins, William, Van Loef, Edgar, Glodo, J., Shah, Kanai, Bhattacharya, P., Tupitsyn, E, Groza, Michael, and Burger, Arnold. Bridgman Growth of Large SrI2:Eu2+ Single Crystals: A High-performance Scintillator for Radiation Detection Applications. United States: N. p., 2013. Web. doi:10.1016/j.jcrysgro.2013.01.035.
Boatner, Lynn A, Ramey, Joanne Oxendine, Kolopus, James A, Hawrami, Rastgo, Higgins, William, Van Loef, Edgar, Glodo, J., Shah, Kanai, Bhattacharya, P., Tupitsyn, E, Groza, Michael, & Burger, Arnold. Bridgman Growth of Large SrI2:Eu2+ Single Crystals: A High-performance Scintillator for Radiation Detection Applications. United States. doi:10.1016/j.jcrysgro.2013.01.035.
Boatner, Lynn A, Ramey, Joanne Oxendine, Kolopus, James A, Hawrami, Rastgo, Higgins, William, Van Loef, Edgar, Glodo, J., Shah, Kanai, Bhattacharya, P., Tupitsyn, E, Groza, Michael, and Burger, Arnold. Tue . "Bridgman Growth of Large SrI2:Eu2+ Single Crystals: A High-performance Scintillator for Radiation Detection Applications". United States. doi:10.1016/j.jcrysgro.2013.01.035.
@article{osti_1089231,
title = {Bridgman Growth of Large SrI2:Eu2+ Single Crystals: A High-performance Scintillator for Radiation Detection Applications},
author = {Boatner, Lynn A and Ramey, Joanne Oxendine and Kolopus, James A and Hawrami, Rastgo and Higgins, William and Van Loef, Edgar and Glodo, J. and Shah, Kanai and Bhattacharya, P. and Tupitsyn, E and Groza, Michael and Burger, Arnold},
abstractNote = {Single-crystal strontium iodide (SrI2) doped with relatively high levels (e.g., 3 - 6 %) of Eu2+ exhibits characteristics that make this material superior, in a number of respects, to other scintillators that are currently used for radiation detection. Specifically, SrI2:Eu2+ has a light yield that is significantly higher than LaBr3:Ce3+ -a currently employed commercial high-performance scintillator. Additionally, SrI2:Eu2+ is characterized by an energy resolution as high as 2.6% at the 137Cs gamma-ray energy of 662 keV, and there is no radioactive component in SrI2:Eu2+ - unlike LaBr3:Ce3+ that contains 138La. The Ce3+-doped LaBr3 decay time is, however, faster (30 nsec) than the 1.2 sec decay time of SrI2:Eu2+. Due to the relatively low melting point of strontium iodide (~515 oC), crystal growth can be carried out in quartz crucibles by the vertical Bridgman technique. Materials-processing and crystal-growth techniques that are specific to the Bridgman growth of europium-doped strontium iodide scintillators are described here. These techniques include the use of a porous quartz frit to physically filter the molten salt from a quartz antechamber into the Bridgman growth crucible and the use of a bent or bulb grain selector design to suppress multiple grain growth. Single crystals of SrI2:Eu2+ scintillators with good optical quality and scintillation characteristics have been grown in sizes up to 5.0 cm in diameter by applying these techniques. Other aspects of the SrI2:Eu2+ crystal-growth methods and of the still unresolved crystal-growth issues are described here.},
doi = {10.1016/j.jcrysgro.2013.01.035},
journal = {Journal of Crystal Growth},
issn = {0022-0248},
number = ,
volume = 379,
place = {United States},
year = {2013},
month = {1}
}