Prospects of Fast-Neutron Resonance Radiography and Requirements for Instrumentation

Vartsky, D.

doi:10.22323/1.025.0084

Cited by 18 publications

(26 citation statements)

References 21 publications

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“…Thanks to the high flux and the long flight distance, the energy resolution will reach 1.8 keV at 1 MeV, and 56.9 keV at 10.0 MeV, with 5 ns temporal resolution. Obviously, these results is much better than the requirement for FNRR instruments proposed by Vartsky [9].…”

Section: Energy Resolution and Spatial Resolutionmentioning

confidence: 69%

“…Under ideal conditions, only a single particle event is processed within a given time interval, a scenario referred to as single-event ToF (SEToF) in Ref. [9]. is easy to count droplets in a bucket under drizzle, whereas it is difficult to count droplets in a pond during the rainstorm.…”

Section: Time-of-flight Measurement and The Model For Neutron Radiogrmentioning

confidence: 99%

“…However, if we could tag the neutron transmission information with the corresponding particle energy via time-of-flight (ToF) measurement and obtain a continuous series of transmission images, more sample information could be collected in a single shot. This idea is similar to that of fast neutron resonance radiography (FNRR), proposed by Vartsky et al, where neutron snapshots are taken by a time-windowed device [9,10,11,12,13,14]. In its proposed form, FNRR utilizes the total neutron cross-sections of elements (such as oxygen, carbon and nitrogen) in the fast-neutron spectral range for elemental analysis [10,15], which makes it of great value for nondestructive analysis of organic materials.…”

Section: Introductionmentioning

confidence: 99%

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Energy-resolved fast neutron resonance radiography at CSNS

Tan

Tang

Jing

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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The white neutron beamline at the China Spallation Neutron Source will be used mainly for nuclear data measurements. It will be characterized by high flux and broad energy spectra. To exploit the beamline as a neutron imaging source, we propose a liquid scintillator fiber array for fast neutron resonance radiography. The fiber detector unit has a small exposed area, which will limit the event counts and separate the events in time, thus satisfying the requirements for single-event time-of-flight (SEToF) measurement.The current study addresses the physical design criteria for ToF measurement, including flux estimation and detector response. Future development and potential application of the technology are also discussed.

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Section: Energy Resolution and Spatial Resolutionmentioning

confidence: 69%

Section: Time-of-flight Measurement and The Model For Neutron Radiogrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy-resolved fast neutron resonance radiography at CSNS

Tan

Tang

Jing

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…Various groups have investigated fast neutron resonance radiography to determine elemental composition [5,6,7]. However these methods require the use of a high energy particle accelerator.…”

Section: Neutron Techniquesmentioning

confidence: 99%

Fast Neutron and Gamma-Ray Interrogation of Cargo Containers

Sowerby¹,

Eberhardt²,

Liu³

et al. 2007

Proceedings of International Workshop on Fast Neutron Detectors and Applications — PoS(FNDA2006)

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There is a worldwide need for improved methods for the scanning of consolidated air cargo for contraband such as illicit drugs and explosives. The strong preference is to directly image the contents of cargo containers without unpacking and with scan times of less than a few minutes per container. In the current paper the various alternative X-ray, gamma-ray and neutron techniques will be discussed and compared.The Commonwealth Science and Industrial Research Organisation (CSIRO) has been working with the Australian Customs Service to develop a scanner capable of directly scanning airfreight containers in 1-2 minutes. The scanner combines fast neutron and gamma-ray radiography (FNGR) to provide high-resolution images that include information on material composition. The composition information greatly facilitates the task of image analysis. A commercial-scale scanner has been installed at an Australian Customs Service facility at Brisbane International Airport to trial the technology and associated business processes. The trial will continue for up to 18 months and includes a comprehensive evaluation by an independent team leader engaged by Customs. The scanner facility incorporates an extensive automated cargo handling system, making possible the continuous processing of large numbers of containers.Results are presented on the image quality of the FNGR scanners, their dynamic range and their ability to discriminate different material compositions. Some results from the FNGR scanner are presented, highlighting the ability of the method to distinguish ill-defined, low-density organic materials that are difficult to detect using conventional X-ray scanners.

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“…Fast-neutron imaging methods, such as Fast-Neutron Resonance Radiography (FNRR) [7], utilize a broad neutron spectrum of 2-10 MeV to provide a sensitive probe for identifying low-Z elements such as H, C, N and O; these are the main constituents of explosives and narcotics. In addition, FNRR provides a means for identifying the type of the explosive by determination of the density ratios of its main constituent elements [7]. FNRR has been also proposed recently for determining of oil and water content in drilled formation cores [8].The requirements from fast-neutron and gamma-ray detectors for contraband detections, are detection efficiency >10% and position resolution better than 5-10 mm for both types of radiation [9 and references therein].…”

mentioning

confidence: 99%

Fast-neutron and gamma-ray imaging with a capillary liquid xenon converter coupled to a gaseous photomultiplier

Israelashvili¹,

Coimbra²,

Vartsky³

et al. 2017

J. Inst.

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Gamma-ray and fast-neutron imaging was performed with a novel liquid xenon (LXe) scintillation detector read out by a Gaseous Photomultiplier (GPM). The 100 mm diameter detector prototype comprised a capillary-filled LXe converter/scintillator, coupled to a triple-THGEM imaging-GPM, with its first electrode coated by a CsI UV-photocathode, operated in Ne/5%CH4 at cryogenic temperatures.Radiation localization in 2D was derived from scintillation-induced photoelectron avalanches, measured on the GPM's segmented anode. The localization properties of 60 Co gamma-rays and a mixed fastneutron/gamma-ray field from an AmBe neutron source were derived from irradiation of a Pb edge absorber. Spatial resolutions of 12±2 mm and 10±2 mm (FWHM) were reached with 60 Co and AmBe sources, respectively. The experimental results are in good agreement with GEANT4 simulations. The calculated ultimate expected resolutions for our application-relevant 4.4 and 15.1 MeV gamma-rays and 1-15 MeV neutrons are 2-4 mm and ~2 mm (FWHM), respectively. These results indicate the potential applicability of the new detector concept to Fast-Neutron Resonance Radiography (FNRR) and Dual-Discrete-Energy Gamma Radiography (DDEGR) of large objects. and simulations (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc); Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc); Photon detectors for UV, visible and IR photons (gas) (gas-photocathodes, solid-photocathodes); Neutron detectors (cold, thermal, fast neutrons); Gamma detectors (scintillators, CZT, HPG, HgI etc); Detection of contraband and drugs; Detection of explosives 2 1 IntroductionGamma-ray and fast-neutron imaging technologies are currently applied for investigating the content of aviation-and marine-cargo containers, trucks and nuclear waste containers (see for example [1, 2]). MeV-scale x-ray or gamma-ray radiographic inspection methods, such as Dual Energy Bremsstrahlung Radiography (DEBR) [3][4][5] or Dual-Discrete-Energy Gamma Radiography (DDEGR) [6], are used for the detection of concealed Special Nuclear Materials (SNM), providing high-resolution images of object shapes and densities and some selectivity between high-Z elements.DEBR makes use of continuous x-ray spectra, generated by accelerated electrons at two different bombarding energies. DDEGR relies on two discrete gamma-rays, of 4.4 MeV and 15.1 MeV, emitted by the 11 B(d,nγ) 12 C reaction. Fast-neutron imaging methods, such as Fast-Neutron Resonance Radiography (FNRR) [7], utilize a broad neutron spectrum of 2-10 MeV to provide a sensitive probe for identifying low-Z elements such as H, C, N and O; these are the main constituents of explosives and narcotics. In addition, FNRR provides a means for identifying the type of the explosive by determination of the density ratios of its main constituent elements [7]. FNRR has been also proposed recently for determining of oil and water content in drilled formation cores [8].The r...

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Prospects of Fast-Neutron Resonance Radiography and Requirements for Instrumentation

Cited by 18 publications

References 21 publications

Energy-resolved fast neutron resonance radiography at CSNS

Energy-resolved fast neutron resonance radiography at CSNS

Fast Neutron and Gamma-Ray Interrogation of Cargo Containers

Fast-neutron and gamma-ray imaging with a capillary liquid xenon converter coupled to a gaseous photomultiplier

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