Demonstration of two-dimensional time-encoded imaging of fast neutrons

Brennan, James S.; Brubaker, E.; Gerling, Mark D; Marleau, Peter; McMillan, Kyle; Nowack, Aaron B.; Galloudec, N. Renard-Le; Sweany, Melinda

doi:10.1016/j.nima.2015.08.076

Cited by 30 publications

(12 citation statements)

References 6 publications

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“…An average of 2,000 neutron events (4-minute measurement time), are required to retain the image quality and localization accuracy. A higher overall count was required to obtain these source images because the signal-to-noise ratio decreases as multiple sources are exposed to the coded aperture imager [20]. Figure 10 shows the radiographic images superimposed upon an optical image generated by a complementary metal oxide-semiconductor (CMOS) image sensor (IMX214 produced by SONY).…”

Section: Resultsmentioning

confidence: 99%

Hand-held Dual-particle Imager Implemented with a Multiplexed Low Sampling-rate Readout of a SiPM-based Pixelated Stilbene Array

Boo¹,

Hammig²,

Jeong³

2020

Preprint

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Dual particle imaging, in which both neutrons and gamma-rays in the environment can be individually characterized, is particularly attractive for monitoring mixed radiation emitters such as special nuclear materials (SNM). Typical dual particle imagers (DPIs) are not readily deployable and easily portable for hand-held applications because they are implemented using bulky single-crystal scintillators and photomultiplier tubes (PMTs) implemented with a 1:1 channel readout. Effective SNM localization and detection also benefits from high instrument sensitivity so that real-time imaging or imaging with a limited number of acquired events is enabled. We have developed a hand-held type DPI equipped with a pixelated stilbene-silicon photomultiplier (SiPM) array module and low sampling-rate analog-to-digital converters (ADCs) processed via a multiplexed readout. The stilbene-SiPM array (12 × 12 pixels) is capable of effectively performing pulse shape discrimination (PSD) between gamma-ray and neutron events and neutron/gamma-ray source localization on the imaging plane, as demonstrated with 252Cf neutron/gamma and 137Cs gamma-ray sources. The low sampling rate ADCs connected to the stilbene-SiPM array module result in a compact instrument with high sensitivity that provides a gamma-ray image of a 137Cs source, producing 6.4 μR/h at 1 m, in less than 69 seconds. A neutron image for a 3.5 × 105 n/s 252Cf source can also be obtained in less than 6 minutes at 1 m from the center of the system. The instrument images successfully with field of view of 50° and provides angular resolution of 6.8°.

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Section: Resultsmentioning

confidence: 99%

Hand-held Dual-particle Imager Implemented with a Multiplexed Low Sampling-rate Readout of a SiPM-based Pixelated Stilbene Array

Boo¹,

Hammig²,

Jeong³

2020

Preprint

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“…A more novel directional detection system enables source localization with only two scintillators and a high-density polyethylene (HDPE) collimator. This system utilizes the technique of time-encoded imaging (TEI) for directional fast neutron and gamma-ray detection [30]. A HDPE time-modulated collimator rotates 360 around two 1inch-by-1inch EJ-309 liquid scintillator cells.…”

Section: Handheld Radiation Detectorsmentioning

confidence: 99%

“…The random pattern of openings on the collimator enables time modulation [30]. Each opening has a designated position on the collimator and associated angle of incidence and time stamp.…”

Section: Figure 32 Tei Directional Detection System [30]mentioning

confidence: 99%

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Applications of Elpasolites as a Multimode Radiation Sensor

Guckes

2016

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“…Recently, we reported on a two-dimensional fast neutron imager using time-encoded imaging (2D-TEI) [6]. That system was designed as a proof of principle for an alternative to coded-aperture imaging, with the distinction that, rather than modulating the radiation field in space and recording the modulation with position sensitive detectors, the field was modulated in time and recorded with a time sensitive detector.…”

Section: Introductionmentioning

confidence: 99%

Source detection at 100 meter standoff with a time-encoded imaging system

Brennan

Brubaker

Marleau

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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We present the design, characterization, and testing of a laboratory prototype radiological search and localization system. The system, based on time-encoded imaging, uses the attenuation signature of neutrons in time, induced by the geometrical layout and motion of the system. We have demonstrated the ability to detect a ∼ 1 mCi 252 Cf radiological source at 100 m standoff with 90% detection efficiency and 10% false positives against background in 12 min. This same detection efficiency is met at 15 s for a 40 m standoff, and 1.2 s for a 20 m standoff.

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Demonstration of two-dimensional time-encoded imaging of fast neutrons

Cited by 30 publications

References 6 publications

Hand-held Dual-particle Imager Implemented with a Multiplexed Low Sampling-rate Readout of a SiPM-based Pixelated Stilbene Array

Hand-held Dual-particle Imager Implemented with a Multiplexed Low Sampling-rate Readout of a SiPM-based Pixelated Stilbene Array

Applications of Elpasolites as a Multimode Radiation Sensor

Source detection at 100 meter standoff with a time-encoded imaging system

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