Results with a 32-element dual mode imager

Brennan, James S.; Cooper, R. L.; Marleau, Peter; Mascarenhas, Nicholas; Mrowka, Stanley

doi:10.1109/nssmic.2010.5874053

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…1). In the past decade, two types of detector systems have been designed for fast neutron scatter imaging and are namely the neutron scatter camera [1][2] , and the neutron time projection chamber (TPC) [3][4] . The neutron scatter camera detects the direction of the fast neutrons based on a method similar to Compton imaging of γ-rays ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The neutron scatter camera detects the direction of the fast neutrons based on a method similar to Compton imaging of γ-rays ( Fig. 1 (a)) and has been utilized as a tool in the process of treaty verification and also in nuclear material monitoring [1] . A typical neutron scatter camera can achieve an angular resolution of 20° (full width at half maximum, FWHM) using the back projection method.…”

Section: Introductionmentioning

confidence: 99%

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Directional fast neutron detection using a time projection chamber and plastic scintillation detectors

Tian

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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A new method for directional fast neutron detection is proposed based on a neutron time projection chamber (TPC) and position-sensitive plastic scintillation detectors. The detection system can efficiently locate the approximate location of a hot spot with 4π field-of-view using only the neutron TPC. Then, the system generates a high-resolution image of the hot spot using selected coincidence events in the TPC and the scintillation detectors. A prototype was built and tested using a 252 Cf source. An efficiency of 7.1×10 -3 was achieved for fast searching. The angular resolution was 7.8° (full width at half maximum, FWHM) for high-resolution imaging using the simple back projection method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Directional fast neutron detection using a time projection chamber and plastic scintillation detectors

Tian

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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show abstract

“…The neutron time projection chamber (TPC) [4,5] and the neutron scatter camera [6][7][8] are two types of neutron scatter imaging systems designed for fast neutron imaging in the past decade. The neutron TPC (figure 1 (a)) is developed for fast neutron imaging with high efficiency and a 4π field of view (FOV).…”

Section: Introductionmentioning

confidence: 99%

Performance study of a directional fast neutron detection system based on TPC and plastic scintillation detectors

Tian

et al. 2019

J. Inst.

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A neutron time projection chamber can locate the approximate direction of a neutron hot spot with high efficiency and a 4π field of view. The angular resolution can be significantly improved by adding several plastic scintillation detectors and using coincidence events. The specific performances of such a coincidence imaging system are studied based on theoretical calculations and experimental results. The calculated value of the angular resolution is approximately 2° for the current system, which agrees well with the experimental results and sets an upper limit for the angular resolution of traditional back projection based online reconstruction methods. Although the statistical iterative method can breakthrough this limit and further improve the angular resolution, the time consumption is usually a problem. The coincidence imaging system can be further optimized for future applications based on the theoretical model.

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Active neutron and gamma-ray imaging of highly enriched uranium for treaty verification

Hamel

Polack

Ruch

et al. 2017

Sci Rep

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The detection and characterization of highly enriched uranium (HEU) presents a large challenge in the non-proliferation field. HEU has a low neutron emission rate and most gamma rays are low energy and easily shielded. To address this challenge, an instrument known as the dual-particle imager (DPI) was used with a portable deuterium-tritium (DT) neutron generator to detect neutrons and gamma rays from induced fission in HEU. We evaluated system response using a 13.7-kg HEU sphere in several configurations with no moderation, high-density polyethylene (HDPE) moderation, and tungsten moderation. A hollow tungsten sphere was interrogated to evaluate the response to a possible hoax item. First, localization capabilities were demonstrated by reconstructing neutron and gamma-ray images. Once localized, additional properties such as fast neutron energy spectra and time-dependent neutron count rates were attributed to the items. For the interrogated configurations containing HEU, the reconstructed neutron spectra resembled Watt spectra, which gave confidence that the interrogated items were undergoing induced fission. The time-dependent neutron count rate was also compared for each configuration and shown to be dependent on the neutron multiplication of the item. This result showed that the DPI is a viable tool for localizing and confirming fissile mass and multiplication.

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Results with a 32-element dual mode imager

Cited by 4 publications

References 5 publications

Directional fast neutron detection using a time projection chamber and plastic scintillation detectors

Directional fast neutron detection using a time projection chamber and plastic scintillation detectors

Performance study of a directional fast neutron detection system based on TPC and plastic scintillation detectors

Active neutron and gamma-ray imaging of highly enriched uranium for treaty verification

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