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Title: Lithium indium diselenide: A new scintillator for neutron imaging

Lithium indium diselenide, 6LiInSe 2 or LISe, is a newly developed neutron detection material that shows both semiconducting and scintillating properties. The 24% atomic density of 6Li yields a thermal neutron mean free path of only 920 μm. This paper reports on the performance of LISe crystals in scintillation mode for its potential use as a converter screen for thermal/cold neutron imaging. The spatial resolution of LISe, determined using a 10% value of the Modulation Transfer Function (MTF), was found to not scale linearly with thickness. Crystals having a thickness of 450 μm or larger resulted in an average spatial resolution of 67 μm, and the thinner crystals exhibited an increase in spatial resolution down to the Nyquist frequency of the CCD. The highest measured spatial resolution of 198 μm thick LISe (27 μm) outperforms a commercial 50 μm thick ZnS(Cu): 6LiF scintillation screen (100 μm) by more than a factor of three. For the thicknesses considered in this study, it has been found that the light yield of LISe did not scale with its thickness, suggesting the need for optimizing the synthesis to enhance the scintillation mechanism. Absorption measurements indicate that the 6Li concentration is uniform throughout the samplesmore » and its absorption efficiency as a function of thickness follows general nuclear theory, indicating that the variation in apparent brightness is likely due to a combination of particle escape, light transport, and activation of the scintillation mechanisms. As a result, the presence of 115In and its long-lived 116In activation product did not result in ghosting (memory of past neutron exposure), demonstrating potential for using LISe for imaging transient systems.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [4] ;  [4] ;  [5] ;  [5] ;  [6]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Y-12 National Security Complex, Oak Ridge, TN (United States)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Fisk Univ., Nashville, TN (United States)
  6. Univ. of Tennessee, Knoxville, TN (United States); Y-12 National Security Complex, Oak Ridge, TN (United States)
Publication Date:
Report Number(s):
MS/STO-170116
Journal ID: ISSN 0168-9002
Grant/Contract Number:
NA0001942; NE0000094
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 830; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
DOE Nuclear Energy University Programs Graduate Fellowship; DOE Scientific User Facilities Division, Office of Basic Energy Sciences
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; neutron imaging; neutron detection; scintillator; lithium indium diselenide; LISe; thermal and cold neutrons
OSTI Identifier:
1347560
Alternate Identifier(s):
OSTI ID: 1425700