Planning of Energy-Selective Neutron Imaging Instrument at CSNS and its Application Prospect in Materials Science

2016 ◽  
Vol 850 ◽  
pp. 161-166 ◽  
Author(s):  
Jie Chen ◽  
Lun Hua He ◽  
Jun Rong Zhang ◽  
Fang Wei Wang
Keyword(s):  
Neutron Source ◽  
Spatial Resolution ◽  
Materials Science ◽  
Neutron Radiography ◽  
Ccd Camera ◽  
Neutron Imaging ◽  
Crystallographic Structure ◽  
Neutron Guide ◽  
Contrast Imaging ◽  
Imaging Instrument

In order to serve a growing multidisciplinary community beyond the traditional scattering areas, an energy-selective neutron imaging instrument is proposed in the China Spallation Neutron Source (CSNS). The instrument is planned to provide analytical techniques such as state-of-the-art energy-selective neutron imaging, neutron radiography, tomography, polarized neutron imaging, neutron phase contrast imaging, and combined neutron diffraction. Coupled hydrogen moderator (CHM) will be chosen as its neutron source. A flight path of 40 m from moderator to sample will provide good energy resolution better than ~0.4%. Super mirror neutron guide will be used to transport neutron from moderator to aperture selector. Aperture selector with 5 apertures and a set of slits will be used to adjust the neutron beam for different modalities. The best spatial resolution will be 50 μm. Different types of detectors will be needed including high spatial resolution CCD camera, TOF detector, and scintillator detector. With a main emphasis on advanced materials and engineering studies, the instrument will enable 2D/3D mapping of the microstructure, chemical composition, and crystallographic structure (grain size, stress and strain, phase position, texture, and so on). It will also support a broad range of studies in archaeology, biology, biomedicine, geosciences, building technology, manufacturing processes, forensic, and homeland security applications.

scholarly journals Neutron guide optimisation for a time-of-flight neutron imaging instrument at the European Spallation Source

2015 ◽  
Vol 23 (1) ◽  
pp. 301 ◽  
Author(s):  
A. Hilger ◽  
N. Kardjilov ◽  
I. Manke ◽  
C. Zendler ◽  
K. Lieutenant ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Neutron Imaging ◽  
Neutron Guide ◽  
Spallation Source ◽  
Imaging Instrument

scholarly journals The First Application of a Gd3Al2Ga3O12:Ce Single-Crystal Scintillator to Neutron Radiography

2021 ◽  
Vol 7 (11) ◽  
pp. 232
Author(s):  
Kazuhisa Isegawa ◽  
Daigo Setoyama ◽  
Hidehiko Kimura ◽  
Takenao Shinohara
Keyword(s):  
Single Crystal ◽  
Spatial Resolution ◽  
Optical System ◽  
Neutron Radiography ◽  
Neutron Imaging ◽  
X Ray ◽  
Optical Magnification ◽  
Crystal Scintillator ◽  
First Time

Neutron radiography is regarded as complementary to X-ray radiography in terms of transmittance through materials, but its spatial resolution is still insufficient. In order to achieve higher resolution in neutron imaging, several approaches have been adopted, such as optical magnification and event centroiding. In this paper, the authors focused on modification of the scintillator. A Gd3Al2Ga3O12:Ce single-crystal scintillator was applied to neutron radiography for the first time and a spatial resolution of 10.5 μm was achieved. The results indicate that this material can be a powerful candidate for a new neutron scintillator providing a resolution in micrometer order by optimizing the optical system and increasing the scintillator luminosity.

Modern Neutron Imaging: Radiography, Tomography, Dynamic and Phase Contrast Imaging with Neutrons

2006 ◽  
Vol 112 ◽  
pp. 61-72 ◽  
Author(s):  
Burkhard Schillinger ◽  
Elbio Calzada ◽  
Klaus Lorenz
Keyword(s):  
Phase Contrast ◽  
State Of The Art ◽  
Neutron Radiography ◽  
Neutron Imaging ◽  
Phase Contrast Imaging ◽  
Neutron Tomography ◽  
X Rays ◽  
Contrast Imaging ◽  
Current State

This paper gives a review about the current state of the art in neutron imaging like neutron radiography, neutron tomography, stroboscopic imaging and phase contrast imaging. The different techniques are described and compared to X-rays.

scholarly journals Application of Z-Contrast Imaging to Obtain Column-by-Column Spectroscopic Analysis of Materials

1992 ◽  
Vol 295 ◽  
Author(s):  
Nigel D. Browning ◽  
Stephen J. Pennycook
Keyword(s):  
Spatial Resolution ◽  
Electron Probe ◽  
Materials Science ◽  
Detection System ◽  
Image Interpretation ◽  
Core Loss ◽  
Scanning Transmission Electron Microscope ◽  
Contrast Imaging ◽  
Experimental Conditions ◽  
Z Contrast

AbstractZ-contrast imaging has been shown to be an effective method for obtaining a highresolution image from a scanning transmission electron microscope (STEM). The incoherent nature of the high-angle scattering makes image interpretation straightforward and intuitive with the resolution limited only by the 2.2 Å electron probe. The optimum experimental conditions for Z-contrast imaging also coincide with those used for analytical microscopy, enabling microanalysis to be performed with the same spatial resolution as the image. The detection limits afforded by a parallel detection system for electron energy loss spectroscopy (EELS) allows column-by-column core-loss spectroscopy to be performed using the Z-contrast image to position the electron probe. Preliminary results from the study of Yba2Cu3O7-δ illustrate the spatial resolution available with this technique and the potential applications for materials science.

scholarly journals A Monte Carlo approach for scattering correction towards quantitative neutron imaging of polycrystals

2018 ◽  
Vol 51 (2) ◽  
pp. 386-394 ◽  
Author(s):  
M. Raventós ◽  
E. H. Lehmann ◽  
M. Boin ◽  
M. Morgano ◽  
J. Hovind ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ad Hoc ◽  
Materials Science ◽  
Neutron Radiography ◽  
A Priori ◽  
Monte Carlo Model ◽  
Neutron Imaging ◽  
Specific Reference ◽  
Attenuation Coefficients ◽  
Transmission Imaging

The development of neutron imaging from a qualitative inspection tool towards a quantitative technique in materials science has increased the requirements for accuracy significantly. Quantifying the thickness or the density of polycrystalline samples with high accuracy using neutron imaging has two main problems: (i) the scattering from the sample creates artefacts on the image and (ii) there is a lack of specific reference attenuation coefficients. This work presents experimental and simulation results to explain and approach these problems. Firstly, a series of neutron radiography and tomography experiments of iron, copper and vanadium are performed and serve as a reference. These materials were selected because they attenuate neutrons mainly through coherent (Fe and Cu) and incoherent (V) scattering. Secondly, anad hocMonte Carlo model was developed, based on beamline, sample and detector parameters, in order to simulate experiments, understand the physics involved and interpret the experimental data. The model, developed in theMcStasframework, usesa prioriinformation about the sample geometry and crystalline structure, as well as beamline settings, such as spectrum, geometry and detector type. The validity of the simulations is then verified with experimental results for the two problems that motivated this work: (i) the scattering distribution in transmission imaging and (ii) the calculated attenuation coefficients.

Applications of high-spatial-resolution microanalysis in materials science

1994 ◽  
Vol 52 ◽  
pp. 976-977
Author(s):  
H. Gu ◽  
J. Mayer ◽  
H. Müllejans ◽  
M. Rühle
Keyword(s):  
Spatial Resolution ◽  
Materials Science ◽  
High Spatial Resolution ◽  
Experimental Studies ◽  
Analytical Electron Microscopy ◽  
Ccd Camera ◽  
Model Systems ◽  
Advanced Materials ◽  
Small Probe ◽  
Electron Energy Loss

The development of advanced materials frequently requires control over the presence and propertiesof interfaces. In order to establish the relationship between the microstructure and the macroscopic behaviour of the material both, the structure and the composition of the interfaces have to be revealed at a resolution at or close to the atomic level. In this paper new techniques in analytical electron microscopy with high spatial resolution will be discussed. The analysis is based on electron energy-loss spectroscopy (EELS). Spatial resolution can either be obtained by applying an energy filteringTEM (EFTEM) or a small probe in a field emission dedicated STEM. Both techniques have been applied toa number of model systems and the achievable detection and resolution limits will be compared. The experimental studies were performed at (i) a Zeiss EM 912 Omega instrument equipped with a 1024 × 1024 slow scan CCD camera and (ii) a VG HB 501 equipped with parallel EELS.

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