Fast neutron- and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll" id="d1e387" altimg="si67.gif"><mml:mi>γ</mml:mi></mml:math>-ray coincidence detection for nuclear security and safeguards applications

Trombetta, Débora M.; Klintefjord, M.; Axell, Kåre; Cederwall, B.

doi:10.1016/j.nima.2019.01.081

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…For each event, the algorithm calculates the probability distribution for the possible points of origin in space from the measured energy deposited by the neutron and the gamma-neutron time difference. Differently from neutron scatter cameras, which can also provide images of SNM, only the detection of one neutron interaction is required while the probability for detection of coincident gamma rays is enhanced due to the much higher prompt fission gamma-ray multiplicity [12]. Since fast neutrons mainly interact via elastic scattering on protons in the organic scintillator, the measured recoil energy samples the incoming neutron kinetic energy and also sets a lower limit of the kinetic energy carried by the incident neutron.…”

Section: Nget Methodsmentioning

confidence: 99%

Performance Evaluation of an Imaging Radiation Portal Monitor System

Vasiljević

Cederwall

2022

Applied Sciences

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An organic scintillator-based radiation portal monitor (RPM) prototype system with imaging capabilities has been developed based on the neutron–gamma emission tomography technique. The technique enables rapid detection and precise location of small amounts of special nuclear materials, such as plutonium, using time and energy correlations between fast neutrons and gamma rays from spontaneous fission with low false-alarm rates. These capabilities, in addition to state-of-the-art detection of various gamma-emitting sources, enables the novel imaging RPM concept to efficiently address global security threats from terrorism and the proliferation of nuclear weapons. The detector approach is simple and versatile and can easily be adapted for different applications in nuclear security, public safety, nuclear emergency response, and radiological surveying. In this work, basic performance parameters of the imaging RPM prototype system developed at KTH have been evaluated.

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Section: Nget Methodsmentioning

confidence: 99%

Performance Evaluation of an Imaging Radiation Portal Monitor System

Vasiljević

Cederwall

2022

Applied Sciences

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“…Most of the γ-rays in fission are emitted in prompt cascades depopulating short-lived (typically picoseconds or shorter) excited states in the fission products, with a multiplicity distribution that can extend significantly beyond an average of 5 to 10 ( 14 – 16 ). Therefore, in particular, fast γ-neutron correlations deserve further attention in the development of more sensitive methods for nuclear safeguards and security applications ( 17 ). These techniques have been used in fundamental nuclear physics experiments for decades [see ( 18 ) for a recent example].…”

Section: Introductionmentioning

confidence: 99%

Rapid imaging of special nuclear materials for nuclear nonproliferation and terrorism prevention

2021

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We introduce a neutron-gamma emission tomography (NGET) technique for rapid detection, three-dimensional imaging, and characterization of special nuclear materials like weapons-grade plutonium and uranium. The technique is adapted from fundamental nuclear physics research and represents a previously unexplored approach to the detection and imaging of small quantities of these materials. The method is demonstrated on a radiation portal monitor prototype system based on fast organic scintillators, measuring the characteristic fast time and energy correlations between particles emitted in nuclear fission processes. The use of these correlations in real time in conjunction with modern machine learning techniques provides unprecedented imaging efficiency and high spatial resolution. This imaging modality addresses global security threats from terrorism and the proliferation of nuclear weapons. It also provides enhanced capabilities for addressing different nuclear accident scenarios and for environmental radiological surveying.

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“…The rf glow discharge could be applied not only to conductive samples but also to non-conducting samples, and this evidently enlarged the application of GD-MS in the direct analysis of nonconducting samples. [8][9][10] As is well known, scintillation crystals play an important role in radiation detection and are extensively used in high-energy physics and nuclear physics, 11 medical, 12,13 security 14 and environmental monitoring 15 area. Most of the mission center in scintillation crystals is mostly rare-earth (RE) ion, mostly Ce 3+ .…”

Section: ． Introductionmentioning

confidence: 99%