Fast Neutron Tomography of Low-Z Object in High-Z Material Shielding

Babai, Ruth Weiss; Sabo-Napadensky, I.; Bar, Doron; Mor, I.; Tamim, N.; Dangendorf, V.; Tittelmeier, K.; Bromberger, B.; Weierganz, M.

doi:10.1016/j.phpro.2015.07.039

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…High-energy neutron imaging has been pursued, in general, with two main goals in mind, (1) to perform energy-selective (TOF-gated) imaging to use resonance-structure-related cross section differences to resolve concentrations of the elements, C, N and O, useful in explosives detection [63][64][65], for example and (2) imaging features shielded by high-Z, materials that are often dense and may be thick [66] and thus are intractable to image even with very high-energy (>1 MeV) X-rays. In addition to these uses, energy-selective imaging can be used to investigate the performance of scintillators and imaging systems as functions of incident neutron energy in order to understand characteristics and to choose or develop optimal components for neutron imaging.…”

Section: High-energy Neutron Imagingmentioning

confidence: 99%

Neutron Imaging at LANSCE—From Cold to Ultrafast

et al. 2018

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(Lujan center), Flight Path 5 beam line and continues to be refined. Applications include: imaging of metallic and ceramic nuclear fuels, fission gas measurements, tomography of fossils and studies of dopants in scintillators. The technique provides the ability to characterize materials opaque to thermal neutrons and to utilize neutron resonance analysis codes to quantify isotopes to within 0.1 atom %. The latter also allows measuring fuel enrichment levels or the pressure of fission gas remotely. More recently, the cold neutron spectrum at the ASTERIX beam line, also located at Target 1, was used to demonstrate phase contrast imaging with pulsed neutrons. This extends the capabilities for imaging of thin and transparent materials at LANSCE. In contrast, high-energy neutron imaging at LANSCE, using unmoderated fast spallation neutrons from Target 4 [Weapons Neutron Research (WNR) facility] has been developed for applications in imaging of dense, thick objects. Using fast (ns), time-of-flight imaging, enables testing and developing imaging at specific, selected MeV neutron energies. The 4FP-60R beam line has been reconfigured with increased shielding and new, larger collimation dedicated to fast neutron imaging. The exploration of ways in which pulsed neutron beams and the time-of-flight method can provide additional benefits is continuing. We will describe the facilities and instruments, present application examples and recent results of all these efforts at LANSCE.

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Section: High-energy Neutron Imagingmentioning

confidence: 99%

Neutron Imaging at LANSCE—From Cold to Ultrafast

et al. 2018

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“…Examples are in mining (detection of carbon in minerals [6]), investigation of integrity of Li-compound structures in high-Z shells [7], tomography of organic material in metal shielding, detection of chemicals, water or structural integrity of wood or concrete [8,9].…”

Section: Potential and Status In Imaging With Fast Neutronsmentioning

confidence: 99%

Potential and status in imaging with fast neutrons

Dangendorf

Zboray

2015

Neutron News

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“…Among them, reactors and large accelerators have been successfully used to develop advanced fast neutron imaging facilities, by virtue of their high neutron fluxes. Fast neutron imaging beam lines or test facilities for example, NECTAR: radiography and tomography station using fission neutrons [12], fast neutron tomography system designed at 500 kW research reactor, Ohio State University [13], and Fast neutron tomography (FNCT) experiments at an accelerator facility of PTB, Germany [14] have proven the potential use of these sources in producing high quality images. The neutron radiography facility relying on large neutron source has good beam quality, high imaging collimation ratio, and high beam intensity at the imaging plane, but the disadvantage is that the facilities are too large and the cost is high, which prevents them from meeting the users local testing needs.…”

Section: Introductionmentioning

confidence: 99%

Imaging of low Z masked with high Z (Pb, U) materials using 14 MeV neutron

Bishnoi,

Patel,

Sarkar

et al. 2024

J. Inst.

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An experimental study has been performed using 14 MeV neutrons for imaging of low Z material (particularly composed of C, H, O elements) masked with thick layers of dense and high Z materials. The experimental setup consists of a D-T neutron generator, a metallic collimator and an imaging system. The imaging system is designed with a polypropylene zinc sulphide scintillator screen integrated with a lens coupled 16-bit ICCD camera. Imaging capability of the system was investigated using iron test samples with holes and line pair features. The minimum hole size of 2 mm could be imaged at a contrast of 36% and a line of 2 mm width visible at a contrast of 24% indicating the system's resolution of ∼ mm. Low Z samples such as water (H2O) and polyethylene (C2H2) n placed behind thick layers of Pb (40 mm) and Uranium (35 mm), were imaged successfully. These images reveal the system's ability towards low Z material imaging in the presence of heavier metals. Good contrast images acquired at a lower neutron yield of ∼ 5 × 108 n/sec of D-T neutron generator has provided a possibility to realise fast neutron imaging having moderate resolution (∼ mm) with a smaller footprint and an economical system design for field applications.

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Fast Neutron Tomography of Low-Z Object in High-Z Material Shielding

Cited by 10 publications

References 2 publications

Neutron Imaging at LANSCE—From Cold to Ultrafast

Neutron Imaging at LANSCE—From Cold to Ultrafast

Potential and status in imaging with fast neutrons

Imaging of low Z masked with high Z (Pb, U) materials using 14 MeV neutron

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