Energy-selective neutron transmission imaging at a pulsed source

Kockelmann, W.; Frei, G.; Lehmann, Eberhard; Vontobel, Peter; Santisteban, J.R.

doi:10.1016/j.nima.2007.05.207

Cited by 162 publications

(94 citation statements)

References 23 publications

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“…Various mechanisms are in use for performing energy selective measurements at other facilities, including the turbine device at continuous sources [9] or reflection by single crystals based on a double-crystal monochromator [10] or the slit method, which uses more than two single crystals to reject neutrons which are outside of the wavelength band required [11]. At ISIS, which is a pulsed source, the energies are selected via time-of-flight measurements (TOF) [12]. Using this method the neutron wavelength (and hence proofs JINST_003P_0713 the corresponding energy) can be determined from the distance it has travelled to the detector position (l) and the travel time (t) taken to do so, i.e.…”

Section: Introductionmentioning

confidence: 99%

Modelling of an imaging beamline at the ISIS pulsed neutron source

Burca¹,

Kockelmann²,

James³

et al. 2013

J. Inst.

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A combined neutron imaging and neutron diffraction facility, IMAT, is currently being built at the pulsed neutron spallation source ISIS in the U.K. A supermirror neutron guide is required to combine imaging and diffraction modes at the sample position in order to obtain suitable time of flight resolutions for energy selective imaging and diffraction experiments. IMAT will make use of a straight neutron guide and we consider here the optimization of the supermirror guide dimensions and characterisation of the resulting beam characteristics, including the homogeneity of the flux distribution in space and energy and the average and peak neutron fluxes. These investigations take into account some main design criteria: to maximise the neutron flux, to minimise geometrical artefacts in the open beam image at the sample position and to obtain a good energy resolution whilst retaining a large neutron bandwidth. All of these are desirable beam characteristics for the proposed imaging and diffraction analysis modes of IMAT.

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Section: Introductionmentioning

confidence: 99%

Modelling of an imaging beamline at the ISIS pulsed neutron source

Burca¹,

Kockelmann²,

James³

et al. 2013

J. Inst.

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“…4,[7][8][9][10][11][12][13][14] The energy resolved neutron imaging reported in this paper covers a broad range of neutron energies, including the thermal and cold neutrons. Therefore not only elemental mapping can be performed from the data acquired in such experiments, but also some microstructure parameters can be reconstructed at the same time, as demonstrated by all the previous thermal neutron transmission studies.…”

Section: Microstructure Of Solid Crystalline Materialsmentioning

confidence: 99%

“…Whereas the technique is frequently performed with a white spectrum using a thermal or cold neutron beam [1][2][3] the characterization options are greatly expanded by energy-resolved imaging [4][5][6] in which transmission spectra are measured for each pixel of the image. This allows spatially-resolved imaging of features related to microstructure variation such as texture and mosaicity, [7][8][9][10] residual strain 7,[10][11][12][13] and phase distributions, 14 when thermal and cold neutrons are used.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24] Energy-resolved measurements can be conducted at reactor sources using velocity selectors 25 and crystal monochromators 26 with energy resolutions (∆E/E) of ∼15% and ∼3%, respectively. By contrast pulsed spallation neutron sources, which typically employ time of flight technique to resolve neutron energy, routinely offer energy resolution to sub-percent levels 4 and extend the spectral range to epithermal neutrons in excess of 10 keV. [15][16][17][18][19][20][21][22][23][24] In the region of ∼1-10 5 eV many elements exhibit isotope-specific resonances that exist over narrow energy ranges specific to a particular isotope.…”

Section: Introductionmentioning

confidence: 99%

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Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging

et al. 2017

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Neutron resonance absorption imaging is a non-destructive technique that can characterize the elemental composition of a sample by measuring nuclear resonances in the spectrum of a transmitted beam. Recent developments in pixelated time-of-flight imaging detectors coupled with pulsed neutron sources pose new opportunities for energy-resolved imaging. In this paper we demonstrate non-contact measurements of the partial pressure of xenon and krypton gases encapsulated in a steel pipe while simultaneously passing the neutron beam through high-Z materials. The configuration was chosen as a proof of principle demonstration of the potential to make non-destructive measurement of gas composition in nuclear fuel rods. The pressure measured from neutron transmission spectra (∼739 ± 98 kPa and ∼751 ± 154 kPa for two Xe resonances) is in relatively good agreement with the pressure value of ∼758 ± 21 kPa measured by a pressure gauge. This type of imaging has been performed previously for solids with a spatial resolution of ∼ 100 μm. In the present study it is demonstrated that the high penetration capability of epithermal neutrons enables quantitative mapping of gases encapsulate within high-Z materials such as steel, tungsten, urania and others. This technique may be beneficial for the non-destructive testing of bulk composition of objects (such as spent nuclear fuel assemblies and others) containing various elements opaque to other more conventional imaging techniques. The ability to image the gaseous substances concealed within solid materials also allows non-destructive leak testing of various containers and ultimately measurement of gas partial pressures with sub-mm spatial resolution.

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“…2,3 Attenuation contrast neutron radiography and tomography allow observations of inner structures of bulk objects, e.g., differences in density, cracks, pores, water, and hydrogen concentrations and uptake. [6][7][8] By means of advanced techniques, e.g., energy resolved neutron imaging, [9][10][11][12] it is possible to gain spatially resolved information about the presence of different structural phases, texture related features or strains. 13 for corresponding observations of the kinetics of many important processes including phase transitions and changes in microstructure and crystal structure or stress fields in materials under variable conditions.…”

Section: Introductionmentioning

confidence: 99%

Flexible sample environment for high resolution neutron imaging at high temperatures in controlled atmosphere

Makowska

Kuhn

Cleemann

et al. 2015

Review of Scientific Instruments

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High material penetration by neutrons allows for experiments using sophisticated sample environments providing complex conditions. Thus, neutron imaging holds potential for performing in situ nondestructive measurements on large samples or even full technological systems, which are not possible with any other technique. This paper presents a new sample environment for in situ high resolution neutron imaging experiments at temperatures from room temperature up to 1100 °C and/or using controllable flow of reactive atmospheres. The design also offers the possibility to directly combine imaging with diffraction measurements. Design, special features, and specification of the furnace are described. In addition, examples of experiments successfully performed at various neutron facilities with the furnace, as well as examples of possible applications are presented. This covers a broad field of research from fundamental to technological investigations of various types of materials and components.

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Energy-selective neutron transmission imaging at a pulsed source

Cited by 162 publications

References 23 publications

Modelling of an imaging beamline at the ISIS pulsed neutron source

Modelling of an imaging beamline at the ISIS pulsed neutron source

Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging

Flexible sample environment for high resolution neutron imaging at high temperatures in controlled atmosphere

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