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WO2008148525A1 - Appareil et procédé de neutronographie - Google Patents

Appareil et procédé de neutronographie Download PDF

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Publication number
WO2008148525A1
WO2008148525A1 PCT/EP2008/004423 EP2008004423W WO2008148525A1 WO 2008148525 A1 WO2008148525 A1 WO 2008148525A1 EP 2008004423 W EP2008004423 W EP 2008004423W WO 2008148525 A1 WO2008148525 A1 WO 2008148525A1
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WIPO (PCT)
Prior art keywords
neutron
source
neutrons
emission
image
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Ceased
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PCT/EP2008/004423
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English (en)
Inventor
John Sved
Victor O. DE HAAN
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H3/00—Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
    • H05H3/06—Generating neutron beams

Definitions

  • Fast neutron radiography is a promising technique for industrial applications.
  • conventional sources of fast neutrons need either a nuclear reactor, or a high intensity radioisotopic neutron source, or a continuous or pulsed neutron generator.
  • a limiting factor is the size and shape of area where fast neutrons are produced in the fast neutron generator.
  • the neutron source is either a collimated near parallel beam from a reactor or a point or spot located at a distance that is sufficient to provide a divergent beam of fast neutrons which is able to be tolerated by the image capture and presentation devices.
  • IEC Inertial Electrostatic Confinement
  • IEC cells are planar array where some cells ability to emit neutrons are disabled by emplacement of solid insulating material to prevent the IEC plasma-gas structure from occurring in selected cells. This large area array will have a predetermined pattern of neutron emission for use in deconvolution processes.
  • a further embodiment of an array of segmented linear geometry electrodes in adjacent reaction chamber assemblies also provides a high efficiency coded aperture effect of larger extent.
  • An objective of the present invention is to utilize the stable plasma gas structure which has a non-homogeneous source image characteristic that is suitable for deconvolution in fast neutron radiography applications.
  • a further objective of the present invention is to maximise the neutron output by avoiding the suppression of neutron production and thereby best utilizing the maximum permitted electrical power. This considerably increases the performance of the inertial electrostatic confinement neutron generator device as the maximum permitted electrical power is determined by the thermal energy which must be transferred out of the neutron generator reaction chamber and the maximum temperature limitation of the central electrode structure.
  • Neutron radiography involves three components: a suitable neutron beam, an object of radiographic interest and a detector, i.e. a device to record the radiation intensity information associated with the neutron beam transmitted through the object.
  • Nuclear fission reactors most commonly supply neutron beams. Accelerators and radioisotopes can provide alternative neutron sources. The important considerations involve the intensity of the neutron source, the spectrum of neutron energies, the collimation of the neutron beam and its time structure. As neutrons pass through an object, they interact with nuclei by scattering and absorption. The probability of such events is an isotopic property and accounts for the unique radiographic information available with neutron beams.
  • N,(z) is the number density of the i-th type isotope at a z-co-ordinate of interest and ⁇ , is its associated microscopic cross section appropriate to the neutron energy spectrum of the beam. Since neutrons constitute a non-ionising form of radiation a converter is needed to create a particle that can be recorded by a photographic film, a photomultiplier tube, a CCD or another kind of detector. The important considerations here are image resolution, detector efficiency and the time needed for the detector to convert a neutron into a usable signal.
  • Fast neutrons are used because of their unique material penetrating properties and their relatively high source strength at which they can be made available. Typical the absorption of X-rays is proportional to the number of electrons present, while the absorption of thermal neutrons varies rapidly from isotope to isotope, enabling the use of isotopic substitution to enhance the contrast. The total macroscopic cross section for fast neutrons is less than its thermal-neutron counter part, thus enabling a larger penetration depth.
  • IR is a measure for the minimal size of an object feature that can be resolved from a radiograph. IR can be defined as the full width at half maximum (FWHM) for the line spread function.
  • the line-spread function is the system response of a (hypothetical) completely absorbing object with an infinitesimally narrow slit.
  • the total line spread function, LS(x) is determined by the convolution of all the different contributions and tends to have a gaussian form
  • the line-spread function depends on the geometry of the instrument and the divergence of the neutron source.
  • an isotropic neutron source is considered, which is valid for neutrons emerging from a beryllium target in the forward direction.
  • the source of neutrons is required to be an ideal point or a practical spot of diameter typically of a few millimetre. With a greater IVD the increased distance can allow an increased spot diameter without reduction of resolution but an increase in exposure duration.
  • the extent of the source spot is also commonly defined by a two dimensional area that is nominally perpendicular to the line of sight axis on which the source and the middle of the object to be illuminated are positioned. This does to preclude other orientations of a two dimensional spot which would be the manifestation of a neutron source in a solid target type of neutron generator.
  • the extent of the spot source is also commonly accepted to be defined by the intensity of emitted neutrons.
  • the instantaneous spot occurs where the narrow beam of ion or neutral particles is impacting on the solid target matrix and microscopic subsurface.
  • the beam may be intentionally directed to move about so as to relieve the local heating, sputter erosion and depletion of reactant embedded in the target metal matrix.
  • the solid target is rotated or in the case of US6870894 moved "rapidly up and down" so as to reduce local heating. Therefore the extent of the spot during the operation of the neutron generator may be larger than the instantaneous extent. In this case the neutron optics are still able to be based on a spot of defined but larger diameter encompassing the area within which the spot is repositioned.
  • a neutron generator with a solid target intended to emit neutrons when it is bombarded with particles can comprise neutron emissive parts and neutron non-emissive parts that are juxtaposed, said emissive and non-emissive parts forming a pattern of the type of that of a coded mask. This method can therefore provide a known source for deconvolution of fast neutron radiographic images.
  • the target according to claim 1 is characterised in that it comprises an extended neutron emissive zone formed from at least one metal hydride, said extended zone cooperating with a mask in neutron non-emissive material, the non-emissive material of the mask partially covering up the extended emissive zone vis-a-vis the particles and forming non- emissive parts.
  • a target is a solid target.
  • the mask function effectively reduces the total neutron emission by blocking a fraction of the particle beam which would otherwise impact on the neutron emitting target. Compensation by effectively increasing the electrical power will add to the cost of the system.
  • the present disclosure is concerned with the utilization of a neutron generator which does not emit a point or circular or elliptical spot from a solid target.
  • the preferred embodiment is the gas-plasma target type of neutron generator described in Sved WO 0301996 which is summarised in the next paragraph.
  • the solid target type of neutron generator as disclosed by Leung US6907097 may be substituted with allowance for a hollow central or peripheral target or multiple coaxial targets when viewed end-on.
  • the fusion collision reactions occur in the surface layer of the solid targets.
  • the perforations in the electrodes occur in such a density that the presently disclosed fusion zone in the gas plasma would be rather homogeneous and thus mitigate the desired distinct beam structure in the plasma-gas mixture.
  • the Inertial Electrostatic Confinement type of neutron generator may be operated in a pressure regime where a stable glow discharge of the fusion capable gas can be established in either a continuous direct current powered mode or in a pulsed mode where the pulse duration may be greater than 1 microsecond and the frequency may range from single pulse to approximately 20 kilohertz. Glow discharge ionization of the neutral gas particles may be assisted by other means such as radio frequency energy injection or supplementary magnetic fields.
  • the structure of the gas plasma mix will be primarily influenced by the electrostatic field defined by the voltage between the inner negative electrode and the positive outer electrode which is normally at ground potential.
  • WO03019996 describes the star mode gas plasma structure which has been reported by others.
  • the utilization of the electrode structure in a linear form of arbitrary length to create linear source geometry was described.
  • the embodiment of a short as practical linear geometry electrode is necessary for the combination of desirable and useful characteristics. This includes mitigation of source parallax effects by keeping the plane of neutron emission as thin as practically achievable. This is nominally 25 mm but a thinner or thicker neutron emission plane is not excluded.
  • the deconvolution is performed by a standard two dimensional fast Fourier transform with a suitable applied cut-off filter. With unlimited measurement accuracy this deconvolution is exact and enables full detail retrieval. The limited accuracy due to the statistical nature of neutron collected images in general destroys this possibility. Due to the special shape of the neutron source of the generator considered here, part of this possibility is restored. The resulting image quality strongly depends on the imaging equipment used and the width of the spokes of the said source.
  • Leung US6907097 June 14, 2005 Discloses a neutron generator which at first inspection appears similar to the IEC device.
  • the internal arrangement of components that may be termed as electrodes serves to guide ion beams onto solid targets which accumulate fusion reactant atoms.
  • the fusion collision reactions occur in the surface layer of the solid targets.
  • the perforations in the electrodes occur in such a density that the presently disclosed fusion zone in the gas plasma would be rather homogeneous and thus mitigate the desired distinct beam structure in the plasma-gas mixture.
  • the disclosure is silent on the present teachings.
  • This disclosure teaches a method of collimation of an extended source of neutrons from an array of point sources.
  • the fast neutrons are moderated to thermal kinetic energies via a venturi like collimator and moderator structure.
  • a beam of parallel moving neutrons is the result of the invention disclosed. It is a means of achieving an ideal flux of neutrons through the object to be imaged by transmission. The disclosure is silent with regard to the present invention.
  • This invention teaches the usage of effective point source neutron generators and gamma sources in a system which combines radiography and spectroscopy to interrogate air cargo containers. It is silent on the present invention.
  • This invention utilises medical imaging to obtain data for a MCNP application to BNCT. It is silent with regard to the present invention.
  • deconvolution is a process used to reverse the effects of convolution on recorded data.
  • the concept of deconvolution is widely used in the techniques of signal processing and image processing. Deconvolution finds many applications in scientific and engineering disciplines.
  • Deconvolution of multiple hole apertures is a known technique whereby a mask which blocks gamma photons has a pattern of holes.
  • the known hole pattern is used in the gamma image deconvolution process.
  • This invention with 142 claims describes a wide range of methods which may be combined to determine the time and position information about a radioactive source so that this information can be used to deconvolute the source image from the image of a body, in particular, a human body and organs or tumours in a nuclear medicine scanning procedure.
  • the radiation source is not specified in detail although it is clearly a small point source such as a radioisotopic source shown in a figure.
  • As a manual or robotic implementation of moving a radiation source the process is slow in comparison with a radiographic imaging process which uses a photographic like approach to image acquisition. The disclosure is silent with regard to the present invention.
  • a neutron generator with a solid target intended to emit neutrons when it is bombarded with particles can comprise neutron emissive parts and neutron non-emissive parts that are juxtaposed, said emissive and non-emissive parts forming a pattern of the type of that of a coded mask.
  • This method can therefore also provide a known source for deconvolution of fast neutron radiographic images. It is silent on the use of plasma-gas and similar non solid target neutron generators and advantages of said neutron generators emission zones to avoid the need for a mask which will effectively block some of the driving energy or bombarding particles to generate neutrons in the solid target.
  • the present invention is distinct in that the neutron emission pattern does not rely on a mask to achieve what is often referred to as a coded aperture.
  • the plasma neutron emission structure in one embodiment provides the deconvolution information.
  • the arrangement of the neutron emission zones within one array structure or within an array of segmented neutron emission zones in adjacent reaction chambers provide the coded aperture or coded source.
  • a neutron radiography apparatus with neutron generator of the type which utilizes a distributed topology of neutron generation which relies totally or in part on fusion reactions within the gas-plasma mixture of fusible low atomic number isotope species to generate neutrons and associated bremsstrahlung x-rays in a low aspect ratio planar topology with radial spoke geometry or any planar reactor configuration, such that the perpendicular to the plane view is of a fixed distributed topology of neutron emission zones of stable structure from which most of the fusion reactions and origins of emitted fast neutrons appear to occur without a loss of available neutrons through absorption or scatter so that said apparatus is used for fast neutron radiography whereby a transmission radiographic image of an object illuminated by said neutron generator is produced by image capture plate means to yield an image which initially suffers from blurring due to the non parallel neutron flux or non- radial neutron flux from a neutron emission source which is not an ideal point nor a small extent spot source that could be tolerated for visually informative radio
  • a method using the apparatus which is an adaptation of deconvolution techniques whereby knowledge of the topology of a neutron and bremsstrahlung x-ray emission structure where the shape and intensity or topology has previously been mapped in sufficient detail to support the deconvolution process where narrow slit like structures are desirable while not absorbing or scattering the neutrons emitted with trajectories leading towards the object to be imaged using the star beam like planar structure of slit sources and a concentrated hub spot or a further adaptation embodiment of this process to the case of a planar array of neutron emission cells which utilise the Inertial Electrostatic Confinement method in a grid of active and passive or inhibited cells to present a pattern of neutron emission spots with conjoined spots forming slits and similarly in another embodiment where the linear segmented electrodes in an array of reaction chambers provide the emission zones wherein each of these embodiments the source topology appears similar to a so- called coded aperture source of neutrons and bremsstrahlung x-rays with high
  • Embodiments of the present invention seek to provide a neutron or neutron and x-ray radiography system with the advantage of source image deconvolution of the non- point source and non parallel beam of neutrons that are emitted by fusion grade plasma-gas reactor devices generally but not exclusively of the inertial electrostatic confinement type.
  • Embodiments of the present invention seek to provide a neutron or neutron and x-ray radiography system with the advantage of no mask to stop or absorb or scatter neutrons and thereby provide highest neutron utilization efficiency.
  • Embodiments of the present invention seek to provide a neutron or neutron and x-ray radiography system with the advantage of large extent coded aperture or coded source patterns that may be optimal for certain applications.
  • Embodiments of the present invention seek to provide a neutron or neutron and x-ray radiography system with the advantage of selectable emission sequence of adjacent linear segmented electrode reaction chambers in a flat plane or curved planar arrangement which may be useful in combination with pulsed neutron techniques where neutron interaction gamma spectroscopic analysis may be combined with the radiography process or the individual emissions from each reaction chamber emission unit may used to deliver stereoscopic images.
  • Embodiments of the present invention seek to provide a neutron or neutron and x-ray radiography system with the advantage of long operational lifetime of the neutron generator which has intrinsically longer operational life than a solid target type without the necessity to reduce the ion beam bombardment intensity and hence total output for endurance extension.
  • FIGURE 1 shows a schematic of a single cathode grid and vessel wall anode cell with a symbolic representation of the plasma-gas structure neutron emission zone
  • FIGURE 2A shows a side view and FTG 2B shows a view perpendicular to a cross section of cathode grid and anode vessel wall with star mode beams within which zones of neutron emission and the central zone of neutron emission occur;
  • FIGURE 3 illustrates a simulated example where (FIG 3A) shows a simulation of arbitrary objects to be imaged by neutrons from a source of known intensity distribution (FIG 3B) which produces a blurred image (FIG 3C) which is deconvoluted to yield (FIG 3D) a reconstructed image of the object.
  • FIGG 3A shows a simulation of arbitrary objects to be imaged by neutrons from a source of known intensity distribution (FIG 3B) which produces a blurred image (FIG 3C) which is deconvoluted to yield (FIG 3D) a reconstructed image of the object.
  • FIG 4A, 4B and 4C show a preferred embodiment of the plasma-gas neutron generator in a planar array (4A) with inhibited cells (4B) to define a coded aperture (4C).
  • FIG 5A and 5B show an embodiment of the segmented electrode linear neutron generator where the active neutron emitting segments are utilized as the so called coded aperture sources in an array of reaction chamber assemblies.
  • FIG. 1 shows a linear electrode IEC type neutron generator which is prior art from WO03019996 with the high voltage section 01 and the vacuum vessel 02 within which a star mode plasma-gas structure 03 has been established.
  • the star shape 03 including depth is simply symbolic in this diagram.
  • Neutrons are generated by fusion grade collisions distributed within the star zone. The neutrons are emitted isotropically. Those fast neutrons which have a favourable direction of motion for the radiography process will exit through the front vessel wall 04 and fly onwards to be intercepted by the detection and imaging device 05 which may be any neutron imaging pixel array or photographic-like image capture plate device. Between the neutron source and the imaging device there will be placed an object 06 to be interrogated by the passage of the neutrons.
  • Transmission radiography will record the alteration of the neutrons caused by the matter in the object.
  • the resultant raw convoluted image 07 will be a blurred with effectively no information of use to the observer.
  • Previously measured information about the shape and other characteristics of the source of neutrons 08 shall be used in a deconvolution algorithm executed by a computer 09 to yield a near true rendition of the image 10 that would be seen if the neutron field had been emitted as a parallel beam or as rays from a point of origin. It is apparent to one skilled in the practices of neutron radiography that thermal neutron and gamma interference from the surroundings with which some of the neutrons will also interact can be mitigated by adding materials that may mitigate these unwanted effects.
  • FIG. 2A shows a side view of the short linear cathode electrode 20 which is prior art from WO03019996 and the supporting electrical conductor 21 which connects to the high voltage feed through structure which is not shown.
  • the outer wall of the vacuum vessel 22 serves as the anode.
  • the number of vanes 23 determines the number of openings in the electrode cage structure and hence the number of star beam or spoke-like plasma-gas structures 24 that will be established as the glow discharge is induced with the application of high voltage and current sufficient to support a high as thermally allowable driving power for the fusion collisions.
  • FIG 2B views the plasma-gas structure from the point of view of the neutron image capture system.
  • the front side of the electrode 20 is removed in the illustration to better reveal the central fusion zone 25 from which much neutrons are emitted as well as from the spokes 24.
  • the density or distribution of neutron emission probability is not illustrated. This characteristic may be measured by techniques which are well known in the field of neutron metrology.
  • FIG. 3 shows the results of a simulation using a deconvolution tool.
  • FIG. 3A illustrates three arbitrary objects with a density structure by which fast neutrons would be affected and scattered.
  • FIG. 3B illustrates a map of neutron source intensity from the end-on viewpoint. In this case there are twelve spokes caused by an electrode with six pairs of opposing openings in the cathode structure.
  • FIG. 3C illustrates the received distribution of transmission neutrons from the hub and spoke shaped source through the objects and adjacent void on a planar detector. The resemblance of the received neutrons to the objects is lost. With only the received pattern there is insufficient information to decipher the blurred image.
  • 3D illustrates the actual reconstruction when information about the source shape is available for the deconvolution algorithm discussed in this disclosure.
  • the reconstructed image shows the three example objects with their relative shape, size and density to neutrons reasonably represented.
  • the noise due to the statistical nature of neutron radiography may be reduced by further deconvolution techniques.
  • An essential factor in this process is the availability of a map of neutron emission density with as great a resolution as possible.
  • the resolution of density isobars is also essential information.
  • the depth position information is also important as it can be used to compensate for the non two dimensional plane that is actually present in the gas-plasma-neutron origin zone.
  • Another essential factor in this process is the minimization of the number of star beams or spoke gas plasma structures. Therefore six, eight, ten or twelve spokes are deemed acceptable. As the number of spokes increases the regions nearest to the hub will merge and thus increase the hub zone diameter and reduce the individuality of each spoke.
  • FIG 4 shows a further embodiment wherein a multitude of neutron origin zones 40 can be achieved in a planar arrangement as disclosed in W02006015863 but with modifications to produce active and inactive cells within a structural array.
  • the cathode electrode 44, 45 is suspended a vacuum chamber 46 and connected to the high voltage power via a conductor 47 and supporting structure 48 with is insulated.
  • Inactive cells 41 may be filled with ceramic electrically insulating parts 42 which could survive in the operational environment.
  • these active cells When viewed along the axis of the star beams 43 which are perpendicular to the plane of the planar electrode 44, 45 these active cells would provide an array 46 of small extent sources.
  • the array may be irregular as in coded aperture masks in order to mitigate ambiguities in the image deconvolution process.
  • FIG. 5A and 5B show the principals of an embodiment for the construction of an array which provides a planar field of djscrete neutron emission zones 51 shown in FIG. 5B which provide the coded aperture function without a mask to stop unwanted emission in the direction perpendicular to the plane.
  • the typical long cathode grid cage electrode topology of WO03019996 is segmented as disclosed in W02006015863.
  • Short electrode segments 52, 53 of arbitrary length may be connected together by electrical conductor segments 54 which are covered with a non conductive sleeve 55 in order to suppress unwanted ion or neutral particle collisions which could induce the generation of neutrons as well as use the electrical current for no useful advantage.
  • Such segmented electrode assemblies are supported by electrically insulating stand-off components (not shown) in sufficiently many locations in order to provide stable positioning of the electrode assembly at the central axis of the reaction chamber 56.
  • the sample coded aperture array shown in FIG. 5B may be lengthened or broadened or rotated to achieve a larger area which may be optimal for certain radiography or radioscopy applications such as inspection of objects of relatively large extent.
  • the ability to feed electrical power separately to each reaction chamber enables strategies to be adopted which may effectively provide stereoscopic radiographic image sets. For example the first exposure of the object to be examined may be performed with reaction chambers a, b and c activated for a duration sufficient to achieve an adequate image on the image capture equipment.
  • reaction chambers c, d and e energized for a similar duration.
  • a stereoscopic pair of images provides advantages for human interpretation of the position of an object within the total volume of the greater object that is being interrogated by the radiography system.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Measurement Of Radiation (AREA)

Abstract

Cette invention se rapporte à un processus de neutronographie utilisant un appareil de production de neutrons dans lequel des réactions de collision à qualité de fusion se produisent dans une zone de mélange gaz-plasma à l'intérieur de la chambre de réaction de façon à ce que le neutron et l'émission de rayons x associée ne proviennent pas d'un point localisé sur une cible solide. Ce processus peut être avantageux si le mode de fonctionnement de la structure gaz-plasma en étoile ou en rayon est utilisé pour établir une géométrie à rayon radial planaire à faible rapport de forme, ou toute configuration de réacteur planaire similaire composée d'un groupe desdites structures gaz-plasma à émission de neutrons, de sorte que la perpendiculaire à la vue en plan soit d'une topologie répartie fixe de zones d'émission de neutrons stables ou prévisibles, ce qui évite ainsi une perte de puissance lorsque l'appareil est utilisé comme partie d'un système de neutronographie rapide utilisant un traitement de déconvolution d'image de transmission du modèle de source de neutrons afin d'obtenir une résolution de l'objet imagé.
PCT/EP2008/004423 2007-06-05 2008-06-03 Appareil et procédé de neutronographie Ceased WO2008148525A1 (fr)

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EP07109663.0 2007-06-05
EP07109663 2007-06-05

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8243353B1 (en) 2008-04-07 2012-08-14 Applied Science Innovations, Inc. Holography-based device, system and method for coded aperture imaging
CN110376227A (zh) * 2014-09-26 2019-10-25 同方威视技术股份有限公司 利用光中子透射对物体成像的方法以及装置
CN114463240A (zh) * 2022-02-10 2022-05-10 哈尔滨工业大学 一种沥青混合料中子图像与X-ray图像的融合处理方法
CN120091491A (zh) * 2025-04-27 2025-06-03 同方威视技术股份有限公司 中子产生装置及物质成分分析系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995030235A2 (fr) * 1994-04-25 1995-11-09 Rockford Technologies Associates, Inc. Generation de particles a confinement inertiel-electrostatique
WO2003019996A1 (fr) * 2001-08-21 2003-03-06 Neutron Systems Development Limited Generateur de neutrons
WO2004064462A1 (fr) * 2003-01-16 2004-07-29 Societe Anonyme D'etudes Et Realisations Nucleaires Cible codee pour source de neutrons
WO2006015863A1 (fr) * 2004-08-12 2006-02-16 John Sved Processus d’interrogation neutronique d’objets en mouvement relatif ou à superficie importante
US20060140326A1 (en) * 2004-10-08 2006-06-29 The Regents Of The University Of Ca Portable low energy neutron source for high sensitivity material characterization

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995030235A2 (fr) * 1994-04-25 1995-11-09 Rockford Technologies Associates, Inc. Generation de particles a confinement inertiel-electrostatique
WO2003019996A1 (fr) * 2001-08-21 2003-03-06 Neutron Systems Development Limited Generateur de neutrons
WO2004064462A1 (fr) * 2003-01-16 2004-07-29 Societe Anonyme D'etudes Et Realisations Nucleaires Cible codee pour source de neutrons
WO2006015863A1 (fr) * 2004-08-12 2006-02-16 John Sved Processus d’interrogation neutronique d’objets en mouvement relatif ou à superficie importante
US20060140326A1 (en) * 2004-10-08 2006-06-29 The Regents Of The University Of Ca Portable low energy neutron source for high sensitivity material characterization

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8243353B1 (en) 2008-04-07 2012-08-14 Applied Science Innovations, Inc. Holography-based device, system and method for coded aperture imaging
CN110376227A (zh) * 2014-09-26 2019-10-25 同方威视技术股份有限公司 利用光中子透射对物体成像的方法以及装置
CN114463240A (zh) * 2022-02-10 2022-05-10 哈尔滨工业大学 一种沥青混合料中子图像与X-ray图像的融合处理方法
CN114463240B (zh) * 2022-02-10 2022-11-18 哈尔滨工业大学 一种沥青混合料中子图像与X-ray图像的融合处理方法
CN120091491A (zh) * 2025-04-27 2025-06-03 同方威视技术股份有限公司 中子产生装置及物质成分分析系统
CN120091491B (zh) * 2025-04-27 2025-07-15 同方威视技术股份有限公司 中子产生装置及物质成分分析系统

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