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Title: Strontium Iodide Instrument Development for Gamma Spectroscopy and Radioisotope Identification

Abstract

Development of the Europium-doped Strontium Iodide scintillator, SrI2(Eu), has progressed significantly in recent years. SrI2(Eu) has excellent material properties for gamma ray spectroscopy: high light yield (>80,000 ph/MeV), excellent light yield proportionality, and high effective atomic number (Z=49) for high photoelectric cross-section. High quality 1.5 and 2 diameter boules are now available due to rapid advances in SrI2(Eu) crystal growth. In these large SrI2(Eu) crystals, optical self-absorption by Eu2+ degrades the energy resolution as measured by analog electronics, but we mitigate this effect through on-the-fly correction of the scintillation pulses by digital readout electronics. Using this digital correction technique we have demonstrated energy resolution of 2.9% FWHM at 662 keV for a 4 in3 SrI2(Eu) crystal, over 2.6 inches long. Based on this digital readout technology, we have developed a detector prototype with greatly improved radioisotope identification capability compared to Sodium Iodide, NaI(Tl). The higher resolution of SrI2(Eu) yields a factor of 2 to 5 improvement in radioisotope identification (RIID) error rate compared to NaI(Tl).

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7];  [7];  [7]
  1. Lawrence Livermore National Laboratory (LLNL)
  2. Lawrence Berkeley National Laboratory (LBNL)
  3. Radiation Monitoring Devices, Watertown, MA
  4. Fisk University, Nashville
  5. ORNL
  6. Bridgeport Instruments, Austin TX
  7. Northrop Grumman SYNOPTICS, North Carolina
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
1185656
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: SPIE Optics + Photonics 2014, San Diego, CA, USA, 20140817, 20140921
Country of Publication:
United States
Language:
English
Subject:
scintillators; gamma ray detection; energy resolution; radioisotope identification

Citation Formats

Beck, P, Cherepy, Nerine, Payne, Stephen A., Swanberg, E., Nelson, K., Thelin, P, Fisher, S E, Hunter, Steve, Wihl, B, Shah, Kanai, Hawrami, Rastgo, Burger, Arnold, Boatner, Lynn A, Momayezi, M, Stevens, K, Randles, M H, and Solodovnikov, D. Strontium Iodide Instrument Development for Gamma Spectroscopy and Radioisotope Identification. United States: N. p., 2014. Web.
Beck, P, Cherepy, Nerine, Payne, Stephen A., Swanberg, E., Nelson, K., Thelin, P, Fisher, S E, Hunter, Steve, Wihl, B, Shah, Kanai, Hawrami, Rastgo, Burger, Arnold, Boatner, Lynn A, Momayezi, M, Stevens, K, Randles, M H, & Solodovnikov, D. Strontium Iodide Instrument Development for Gamma Spectroscopy and Radioisotope Identification. United States.
Beck, P, Cherepy, Nerine, Payne, Stephen A., Swanberg, E., Nelson, K., Thelin, P, Fisher, S E, Hunter, Steve, Wihl, B, Shah, Kanai, Hawrami, Rastgo, Burger, Arnold, Boatner, Lynn A, Momayezi, M, Stevens, K, Randles, M H, and Solodovnikov, D. Wed . "Strontium Iodide Instrument Development for Gamma Spectroscopy and Radioisotope Identification". United States.
@article{osti_1185656,
title = {Strontium Iodide Instrument Development for Gamma Spectroscopy and Radioisotope Identification},
author = {Beck, P and Cherepy, Nerine and Payne, Stephen A. and Swanberg, E. and Nelson, K. and Thelin, P and Fisher, S E and Hunter, Steve and Wihl, B and Shah, Kanai and Hawrami, Rastgo and Burger, Arnold and Boatner, Lynn A and Momayezi, M and Stevens, K and Randles, M H and Solodovnikov, D},
abstractNote = {Development of the Europium-doped Strontium Iodide scintillator, SrI2(Eu), has progressed significantly in recent years. SrI2(Eu) has excellent material properties for gamma ray spectroscopy: high light yield (>80,000 ph/MeV), excellent light yield proportionality, and high effective atomic number (Z=49) for high photoelectric cross-section. High quality 1.5 and 2 diameter boules are now available due to rapid advances in SrI2(Eu) crystal growth. In these large SrI2(Eu) crystals, optical self-absorption by Eu2+ degrades the energy resolution as measured by analog electronics, but we mitigate this effect through on-the-fly correction of the scintillation pulses by digital readout electronics. Using this digital correction technique we have demonstrated energy resolution of 2.9% FWHM at 662 keV for a 4 in3 SrI2(Eu) crystal, over 2.6 inches long. Based on this digital readout technology, we have developed a detector prototype with greatly improved radioisotope identification capability compared to Sodium Iodide, NaI(Tl). The higher resolution of SrI2(Eu) yields a factor of 2 to 5 improvement in radioisotope identification (RIID) error rate compared to NaI(Tl).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {1}
}

Conference:
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