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18 September 2018 Crystal growth and characterization of selected high-performance scintillators for national security applications (Conference Presentation)
Luis Stand, Mariya Zhuravleva, Merry Koschan, Daniel Rutstrom, Cordell Delzer, Eric Lukosi, Jason Hayward, Nerine J. Cherepy, Stephen Payne, Charles L. Melcher
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Proceedings Volume 10762, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XX; 1076202 (2018) https://doi.org/10.1117/12.2323871
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States
Abstract
Scintillators are important materials for radiation detection applications such as homeland security, geological exploration, and medical imaging. Scintillators for nuclear nonproliferation applications in particular must have excellent energy resolution in order to distinguish the gamma-ray signatures of potentially dangerous radioactive sources, such as highly enriched uranium or plutonium, from non-threat radioactive sources such as radioactive tracers used in medical imaging. There is an established need for scintillators with energy resolution in the 1-2% range at 662 keV. However, there are challenges surrounding the development of this new generation of high light yield/high resolution scintillators; for example, the high cost of production due to low crystal yield and slow growth process, and crystal inhomogeneity. We will discuss efforts focused on developing recently discovered high performance scintillators K(Sr,Ba)2I5:Eu, Cs4(Ca,Sr)I6:Eu and Cs2Hf(Cl,Br)6 that have potential for meeting nuclear security needs. Growth parameters for these materials have been optimized, allowing the growth of excellent quality single crystals measuring up to one-inch in diameter via the vertical Bridgman technique at translation rates between 1 and 5 mm/h. These scintillators materials have excellent properties with light yields between 30,000 and 120,000 ph/MeV, and energy resolutions between 2.3 and 4.6% at 662 keV.
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Luis Stand, Mariya Zhuravleva, Merry Koschan, Daniel Rutstrom, Cordell Delzer, Eric Lukosi, Jason Hayward, Nerine J. Cherepy, Stephen Payne, and Charles L. Melcher "Crystal growth and characterization of selected high-performance scintillators for national security applications (Conference Presentation)", Proc. SPIE 10762, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XX, 1076202 (18 September 2018); https://doi.org/10.1117/12.2323871
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KEYWORDS
Scintillators
Crystals
Homeland security
Medical imaging
Gamma radiation
Image resolution
Plutonium
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