Novel Neutron Detector Material: Microcolumnar Li<sub>&lt;italic&gt;x&lt;/italic&gt;</sub>Na<sub>1–&lt;italic&gt;x&lt;/italic&gt;</sub>I:Eu

Marshall, Matthew S. J.; Moré, M.J.; Bhandari, Harish B.; Riedel, Richard A.; Waterman, S. W.; Crespi, John; Nickerson, P.; Miller, Stuart; Nagarkar, Vivek V.

doi:10.1109/tns.2017.2762859

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…The neutron response of LNI films has been previously reported [7] and a GEE of 4.3 MeV was observed from a 375 µm thick film. Both crystals and films provide excellent gamma-neutron discrimination [1,2], which is particularly important for neutron scattering measurements and the Anger camera has the capability to take advantage of this to remove gamma events and increase signal-noise ratio in the images.…”

Section: Neutron Responsementioning

confidence: 68%

High-resolution Detector for Neutron Diffraction and Quantification of Subsurface Residual Stress

Bhattacharya

Nagarkar

Riedel

et al. 2020

Neutron Radiography - WCNR-11

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We have developed a new high-resolution large-area detector for neutron diffraction imaging, specifically for the measurement of subsurface residual stress in engine components. Neutron diffraction typically requires monochromatic thermal or cold neutrons, neutron flux at the detector is orders of magnitude lower than for standard neutron radiography. Therefore the detection efficiency for incident neutrons must be maximized in order to reduce acquisition times. Here we use the high absorption cross section of LNI ( 6 Li x Na 1-x I:Eu,Tl) scintillators coupled to an Anger camera consisting of an array of silicon photomultiplier (SiPM) detectors. The LNI scintillator developed at RMD is derived from the well-known NaI scintillator and comes in two formats for this application, a vapor-deposited film and a crystal sliced into 1-2 mm thick layers for imaging. In either case, 95% enriched 6 Li was utilized. LNI crystal slices have demonstrated high light yield, for example a 1 mm thick sample with 10% Li produced a 40,900 photons/MeV gamma response and a neutron response with gamma equivalent energy (GEE) of 3.76 MeV, indicating 153,800 photons/neutron. In general higher Li content decreases the light yield but increases the GEE up to 4.8 MeV, which is approximately the theoretical maximum. Use of spatially resolved detectors for diffraction signals from single and polycrystalline materials is gaining strong interest from the neutron community, particularly from advanced light source users who benefit from plenty of photons to work with. Since diffraction signals from polycrystalline materials are inherently weak, the use of this approach at neutron facilities, which typically provide a low flux of neutrons in the thermal or cold energy ranges, poses unique problems. This paper presents aspects of utilizing high-resolution and high efficiency neutron detectors for obtaining important engineering measurements such as residual stress considering the target materials of interest. We present for the first time measurements associated with diffraction signals captured using an Anger camera with high spatial resolution for an example scattering polycrystalline powder appropriate for the incident mono-energetic cold neutrons at the CG1 (Cold Guide Hall) beamline of the High Flux Isotope Reactor at the Oak Ridge National Laboratory.

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Section: Neutron Responsementioning

confidence: 68%

High-resolution Detector for Neutron Diffraction and Quantification of Subsurface Residual Stress

Bhattacharya

Nagarkar

Riedel

et al. 2020

Neutron Radiography - WCNR-11

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“…In addition to CsI, self‐growth array‐derived structured scintillators have been reported with CsBr, [ 69 ] LaBr 3 , [ 70 ] LiI, [ 71 ] Li x Na 1− x I, [ 72 ] Lu 2 O 3 , [ 73,74 ] and ZnO. [ 75,76 ] For the application of radioluminescence microscopy, Sengupta and co‐workers fabricated Lu 2 O 3 : Eu 3+ array‐derived structured scintillator with a thickness of 6–10 nm on a sapphire substrate via electron‐beam physical vapor deposition technique.…”

Section: Array‐derived Structured Scintillatorsmentioning

confidence: 99%

Structured Scintillators for Efficient Radiation Detection

Lin

Yang

et al. 2021

Advanced Science

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Scintillators, which can convert high‐energy ionizing radiation into visible light, have been serving as the core component in radiation detectors for more than a century of history. To address the increasing application demands along with the concern on nuclear security, various strategies have been proposed to develop a next‐generation scintillator with a high performance in past decades, among which the novel approach via structure control has received great interest recently due to its high feasibility and efficiency. Herein, the concept of “structure engineering” is proposed for the exploration of this type of scintillators. Via internal or external structure design with size ranging from micro size to macro size, this promising strategy cannot only improve scintillator performance, typically radiation stopping power and light yield, but also extend its functionality for specific applications such as radiation imaging and therapy, opening up a new range of material candidates. The research and development of various types of structured scintillators are reviewed. The current state‐of‐the‐art progresses on structure design, fabrication techniques, and the corresponding applications are discussed. Furthermore, an outlook focusing on the current challenges and future development is proposed.

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“…To date, thermal neutron detectors have been used, starting with 3 He gas detectors [4-6] and followed by BF 3 gas detectors [7,8], Ce:Cs 2 LiYCl 6 [9,10], Tl,Li:NaI(NaIL) [11,12], and Ce,Eu:LiCaAlF 6 [13,14] single-crystal scintillator detectors. The current mainstream is Ce:Cs 2 LiYCl 6 , a single-crystal scintillator.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator

Sasaki,

Kamada,

Yoshino

et al. 2024

Crystals

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The 3He gas is commonly used for the detection of thermal neutrons. However, with the depletion of 3He gas, there is a need to develop new solid scintillators for thermal neutron detection. Solid scintillators containing 6Li, which have large neutron capture cross-sections and a large amount of energy released by transmutation reactions, are commonly used as alternative candidates. However, only single-crystal scintillators are currently used, and their 6Li concentration is limited by their chemical composition. In this study, we designed, grew, and evaluated a new eutectic scintillator, Rb2CeCl5/LiCl, which can improve the 6Li concentration compared with single-crystal scintillators. Rb2CeCl5, which was selected as the scintillator phase, has excellent scintillator properties (light yield: 36,000 photons/MeV, decay time: mostly 24 ns, slightly 153 ns), and is less deliquescent than other halide scintillators. The crystal grown using the vertical Bridgman method exhibited a eutectic phase composed of Rb2CeCl5 and LiCl. The eutectic crystals exhibited Ce3+ 5d-4f emissions, with a peak between 360 and 370 nm. The Rb2CeCl5 phase was identified as the luminescent phase via cathodoluminescence mapping, and 16,000 photons/neutron of the light yield and 56.1 ns of the decay time were observed. This study indicates that the Rb2CeCl5/LiCl eutectic scintillator is a promising candidate for use in thermal neutron detectors.

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Novel Neutron Detector Material: Microcolumnar Li_{<italic>x</italic>}Na_{1–<italic>x</italic>}I:Eu

Cited by 8 publications

References 6 publications

High-resolution Detector for Neutron Diffraction and Quantification of Subsurface Residual Stress

High-resolution Detector for Neutron Diffraction and Quantification of Subsurface Residual Stress

Structured Scintillators for Efficient Radiation Detection

Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator

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Novel Neutron Detector Material: Microcolumnar Li<italic>x</italic>Na1–<italic>x</italic>I:Eu

Cited by 8 publications

References 6 publications

High-resolution Detector for Neutron Diffraction and Quantification of Subsurface Residual Stress

High-resolution Detector for Neutron Diffraction and Quantification of Subsurface Residual Stress

Structured Scintillators for Efficient Radiation Detection

Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator

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Product

Resources

About

Novel Neutron Detector Material: Microcolumnar Li_{<italic>x</italic>}Na_{1–<italic>x</italic>}I:Eu