scholarly journals Investigation of the use of Coincidences Between Fast Neutrons and Gamma Rays for the Detection of Special Nuclear Materials

2021 ◽  
Author(s):  
Débora M. Trombetta ◽  
Bo Cederwall ◽  
Kåre Axell
Keyword(s):  
Gamma Rays ◽  
Fast Neutrons ◽  
Nuclear Materials ◽  
Special Nuclear Materials

scholarly journals Modeling the Production of Beta-Delayed Gamma Rays for the Detection of Special Nuclear Materials

2005 ◽  
Author(s):  
J Hall ◽  
J Pruet ◽  
D Brown ◽  
M Descalle ◽  
G Hedstrom ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Nuclear Materials ◽  
Special Nuclear Materials ◽  
Beta Delayed

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

2021 ◽  
Vol 7 (21) ◽  
pp. eabg3032
Author(s):  
Jana Petrović ◽  
Alf Göök ◽  
Bo Cederwall
Keyword(s):  
Nuclear Physics ◽  
Imaging Modality ◽  
Three Dimensional ◽  
Nuclear Fission ◽  
Machine Learning Techniques ◽  
Nuclear Materials ◽  
Prototype System ◽  
Fast Time ◽  
Gamma Emission ◽  
Special Nuclear Materials

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.

scholarly journals Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jihwan Boo ◽  
Mark D. Hammig ◽  
Manhee Jeong
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Sampling Rate ◽  
High Sensitivity ◽  
Pulse Shape Discrimination ◽  
Nuclear Materials ◽  
Silicon Photomultiplier ◽  
Analog To Digital ◽  
Particle Imaging ◽  
Imaging Plane

AbstractDual 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). Effective SNM localization and detection benefits from high instrument sensitivity so that real-time imaging or imaging with a limited number of acquired events is enabled. For portable applications, one also desires a dual particle imager (DPI) that is readily deployable. 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 s. A neutron image for a 3.5 × 105 n/s 252Cf source can also be obtained in less than 6 min 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°.

Late Effects of Fast Neutrons and Gamma-Rays in Mice as Influenced by the Dose Rate of Irradiation: Induction of Neoplasia

1970 ◽  
Vol 41 (3) ◽  
pp. 467 ◽  
Author(s):  
A. C. Upton ◽  
M. L. Randolph ◽  
J. W. Conklin ◽  
M. A. Kastenbaum ◽  
M. Slater ◽  
...  
Keyword(s):  
Dose Rate ◽  
Gamma Rays ◽  
Late Effects ◽  
Fast Neutrons
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