Dual-particle imager for standoff detection of special nuclear material

Polack, J. Kyle; Poitrasson-Rivière, Alexis; Hamel, Michael C.; Ide, Kiyotaka; McMillan, Kyle; Clarke, Shaun D.; Flaska, Marek; Pozzi, Sara A.

doi:10.1109/nssmic.2011.6154355

Cited by 13 publications

(13 citation statements)

References 3 publications

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“…Therefore, the unfolded neutron-background spectrum was implemented to a previouslycreated MCNPX-PoliMi model of the neutron-scatter camera (a prototype of the dual-particle imager) [5], and simple-backprojection images of the background neutrons were acquired. The neutron-scatter camera consists of two planes containing 2 by 2 arrays of liquid scintillators; the front plane consists of four 7.62-cm diameter by 5.08-cm EJ-309 liquid scintillators with PMTs and the rear plane consist of four 7.62-cm diameter by 7.62-cm EJ-309 liquid scintillators with PMTs.…”

Section: Backprojection Image Using Unfolded Neutron-background Spectrummentioning

confidence: 99%

“…The neutron-scatter camera can identify the location of sources emitting neutrons, such as plutonium, and has the advantage of being sensitive to fast-neutrons which are difficult to shield by high-Z materials (these materials effectively shield gamma rays). Recently, some research has been performed to combine the capabilities of Compton and neutron-scatter cameras to build a system that would be more efficient in detecting radioactive materials at standoff distances and less prone to false alarms [4,5]. One clear advantage of utilizing fast neutrons is their relatively rare abundance in a typical radiation background [6].…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, accurate neutron-background description is required for developing and optimizing a dual-particle imager that is sensitive to both neutrons and gamma rays [5]. Detailed simulations are needed to optimize the existing prototype; therefore, accurate description of the neutron background is necessary.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of a measured neutron background below 6MeV for fast-neutron imaging systems

Ide

Becchetti

Flaska

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Backprojection Image Using Unfolded Neutron-background Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of a measured neutron background below 6MeV for fast-neutron imaging systems

Ide

Becchetti

Flaska

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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“…Another dual neutron and gamma-ray imaging concept involves the use of organic and sometimes inorganic scintillator arrays arranged in parallel layers. Examples of this array-based design are the multi-layered electronic collimation based approach investigated by Polack et al [20,21] and the multi-layered coded-aperture based approach investigated by Ayaz-Maierhafer et al [22]. A noticeable drawback in these designs are the scintillators integrated with PMT units which can be bulky and heavy with the most utilised detectors in multiple detector/multi-layered designs being liquid organic scintillators (mainly EJ-309) and inorganic scintillators (usually NaI(Tl) and CsI(Tl)) [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Neutron/gamma pulse discrimination analysis of GS10 lithium glass and EJ-204 plastic scintillators

2020

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Two radiation sensitive scintillators known for their dual sensitivity to neutron and gamma-ray fields are investigated for their pulse discrimination abilities; a lithium glass GS10 inorganic scintillator and a fast organic plastic scintillator EJ-204. Each of these scintillators are optically coupled with an 8 × 8-silicon photomultiplier array to act as a photodetector. Pulse height analysis, the charge comparison method and pulse gradient analysis have all been applied here on neutron and gamma-ray events generated by a Cf-252 source. The three discrimination methods were evaluated based on the figure of merit of the probability density plots generated. Within a GS10 crystal, it has been deduced that pulse height analysis and pulse gradient analysis possess greater abilities to discriminate between the two radiation fields compared to the charge comparison method with both showing a figure of merit of over one. The charge comparison method indicated a lower discrimination ability with a figure of merit around 0.3. When the EJ-204 detector was used, it was deduced that only pulse height analysis exhibits discrimination abilities with a figure of merit around 0.6, while the other two discrimination methods presented no distinction between the two radiation fields.

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“…A dual-particle imager (DPI), which is being developed for the detection of special nuclear material, is used to measure source spectra [1][2][3]. This study will focus on the neutron detection capabilities of the system.…”

Section: Introductionmentioning

confidence: 99%

Time-of-flight neutron spectrum unfolding for mixed-oxide nuclear fuel and plutonium metal using a dual-particle imager

Hamel

Polack

Poitrasson-Rivière

et al. 2014

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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1 Abstract-A dual-particle imager with sensitivity to both neutrons and photons has been developed for the detection of special nuclear material. This system has the capability to provide spectral information on detected sources that is useful for safeguard applications. In nuclear facilities with high photon background rates, neutron detection can aid in identification and verification capabilities. The dual-particle imager creates a reconstructed neutron spectrum by correlating neutron counts in pairs of liquid scintillators. The reconstructed spectrum, a combination of energy deposited and time-of-flight, contains resolution effects that blur the true, emitted source-spectrum. To reduce the impact of resolution effects, the reconstructed spectrum can be unfolded to create an estimated source spectrum. A statistical technique, maximum-likelihood expectation-maximization, has been shown to produce an unfolded result for Cf-252 and Am-Be. This technique requires a system response-matrix that contains reconstructed spectra for single neutron energies. Since measuring mono-energetic neutrons is difficult, the system-response-matrix is simulated. Monte Carlo modeling with MCNPX-PoliMi has been show to produce an accurate system response. This work expands on previous neutron unfolding results by showing results for mixedoxide fuel and plutonium metal measured with the dual-particle imager. These results also demonstrate the ability of the dualparticle imager to discrimination between spontaneous fission neutrons and ( ,n) reaction neutrons.

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Dual-particle imager for standoff detection of special nuclear material

Cited by 13 publications

References 3 publications

Analysis of a measured neutron background below 6MeV for fast-neutron imaging systems

Analysis of a measured neutron background below 6MeV for fast-neutron imaging systems

Neutron/gamma pulse discrimination analysis of GS10 lithium glass and EJ-204 plastic scintillators

Time-of-flight neutron spectrum unfolding for mixed-oxide nuclear fuel and plutonium metal using a dual-particle imager

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