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Proceedings Paper

High energy resolution scintillators for nuclear nonproliferation applications
Author(s): M. Zhuravleva; C. L. Melcher; L. Stand; A. Lindsey; H. Wei; C. Hobbs; M. Koschan
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Paper Abstract

The detection of ionizing radiation is important in numerous applications related to national security ranging from the detection and identification of fissile materials to the imaging of cargo containers. A key performance criterion is the ability to reliably identify the specific gamma-ray signatures of radioactive elements, and energy resolution approaching 2% at 662 keV is required for this task. In this work, we present discovery and development of new high energy resolution scintillators for gamma-ray detection. The new ternary halide scintillators belong to the following compositional families: AM2X5:Eu, AMX3, and A2MX4:Eu (A = Cs, K; M = Ca, Sr, Ba; X = Br, I) as well as mixed elpasolites Cs2NaREBr3I3:Ce (RE = La, Y). Using thermal analysis, we confirmed their congruent melting and determined crystallization and melting points. Using the Bridgman technique, we grew 6, 12 and 22 mm diameter single crystals and optimized the Eu concentration to obtain the best scintillation performance. Pulse-height spectra under gamma-ray excitation were recorded in order to measure scintillation light output, energy resolution and light output nonproportionality. The KSr2I5:Eu 4% showed the best combination of excellent crystal quality obtained at fast pulling rates and high light output of ~95,000 photons/MeV with energy resolution of 2.4% at 662 keV.

Paper Details

Date Published: 9 September 2014
PDF: 12 pages
Proc. SPIE 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI, 921303 (9 September 2014); doi: 10.1117/12.2064191
Show Author Affiliations
M. Zhuravleva, The Univ. of Tennessee Knoxville (United States)
C. L. Melcher, The Univ. of Tennessee Knoxville (United States)
L. Stand, The Univ. of Tennessee Knoxville (United States)
A. Lindsey, The Univ. of Tennessee Knoxville (United States)
H. Wei, The Univ. of Tennessee Knoxville (United States)
C. Hobbs, The Univ. of Tennessee Knoxville (United States)
M. Koschan, The Univ. of Tennessee Knoxville (United States)


Published in SPIE Proceedings Vol. 9213:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI
Arnold Burger; Larry Franks; Ralph B. James; Michael Fiederle, Editor(s)

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