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Title: SrI2 scintillator for gamma ray spectroscopy

Abstract

We are working to perfect the growth of divalent Eu-doped strontium iodide single crystals and to optimize the design of SrI 2(Eu)-based gamma ray spectrometers. SrI 2(Eu) offers a light yield in excess of 100,000 photons/MeV and light yield proportionality surpassing that of Ce-doped lanthanum bromide. Thermal and x-ray diffraction analyses of SrI2 and EuI2 indicate an excellent match in melting and crystallographic parameters, and very modest thermal expansion anisotropy. We have demonstrated energy resolution with SrI2(4-6%Eu) of 2.6% at 662 keV and 7.6% at 60 keV with small crystals, while the resolution degrades somewhat for larger sizes. Our experiments suggest that digital techniques may be useful in improving the energy resolution in large crystals impaired by light-trapping, in which scintillation light is re-absorbed and re-emitted in large and/or highly Eu2+ -doped crystals. The light yield proportionality of SrI2(Eu) is found to be superior to that of other known scintillator materials, such as LaBr3(Ce) and NaI(Tl).

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [4];  [4];  [2];  [4];  [4];  [5]
  1. Lawrence Livermore National Laboratory (LLNL)
  2. Fisk University, Nashville, TN
  3. ORNL
  4. Radiation Monitoring Devices, Watertown, MA
  5. Lawrence Berkeley National Laboratory (LBNL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
967342
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: SPIE Optics+Photonics, SPIE Optics+Photonics, CA, USA, 20090802, 20090806
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; GAMMA SPECTROMETERS; STRONTIUM IODIDES; DOPED MATERIALS; EUROPIUM IODIDES; PHOSPHORS; MATERIALS TESTING; ENERGY RESOLUTION

Citation Formats

Cherepy, Nerine, Sturm, Benjamin, Drury, Owen, Hurst, T., Sheets, Steven, Ahle, Larry, Saw, C., Pearson, M., Payne, Stephen A., Burger, Arnold, Boatner, Lynn A, Ramey, Joanne Oxendine, Van Loef, Edgar, Glodo, J., Hawrami, Rastgo, Higgins, William, Shah, Kanai, and Moses, W. W. SrI2 scintillator for gamma ray spectroscopy. United States: N. p., 2009. Web.
Cherepy, Nerine, Sturm, Benjamin, Drury, Owen, Hurst, T., Sheets, Steven, Ahle, Larry, Saw, C., Pearson, M., Payne, Stephen A., Burger, Arnold, Boatner, Lynn A, Ramey, Joanne Oxendine, Van Loef, Edgar, Glodo, J., Hawrami, Rastgo, Higgins, William, Shah, Kanai, & Moses, W. W. SrI2 scintillator for gamma ray spectroscopy. United States.
Cherepy, Nerine, Sturm, Benjamin, Drury, Owen, Hurst, T., Sheets, Steven, Ahle, Larry, Saw, C., Pearson, M., Payne, Stephen A., Burger, Arnold, Boatner, Lynn A, Ramey, Joanne Oxendine, Van Loef, Edgar, Glodo, J., Hawrami, Rastgo, Higgins, William, Shah, Kanai, and Moses, W. W. Thu . "SrI2 scintillator for gamma ray spectroscopy". United States.
@article{osti_967342,
title = {SrI2 scintillator for gamma ray spectroscopy},
author = {Cherepy, Nerine and Sturm, Benjamin and Drury, Owen and Hurst, T. and Sheets, Steven and Ahle, Larry and Saw, C. and Pearson, M. and Payne, Stephen A. and Burger, Arnold and Boatner, Lynn A and Ramey, Joanne Oxendine and Van Loef, Edgar and Glodo, J. and Hawrami, Rastgo and Higgins, William and Shah, Kanai and Moses, W. W.},
abstractNote = {We are working to perfect the growth of divalent Eu-doped strontium iodide single crystals and to optimize the design of SrI 2(Eu)-based gamma ray spectrometers. SrI 2(Eu) offers a light yield in excess of 100,000 photons/MeV and light yield proportionality surpassing that of Ce-doped lanthanum bromide. Thermal and x-ray diffraction analyses of SrI2 and EuI2 indicate an excellent match in melting and crystallographic parameters, and very modest thermal expansion anisotropy. We have demonstrated energy resolution with SrI2(4-6%Eu) of 2.6% at 662 keV and 7.6% at 60 keV with small crystals, while the resolution degrades somewhat for larger sizes. Our experiments suggest that digital techniques may be useful in improving the energy resolution in large crystals impaired by light-trapping, in which scintillation light is re-absorbed and re-emitted in large and/or highly Eu2+ -doped crystals. The light yield proportionality of SrI2(Eu) is found to be superior to that of other known scintillator materials, such as LaBr3(Ce) and NaI(Tl).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {1}
}

Conference:
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