The Development of a Parameterized Scatter Removal Algorithm for Nuclear Materials Identification System Imaging

Grogan, Brandon R

doi:10.2172/973840

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…The inadequacies in the fits are attributed to the imperfect scattering correction that has been previously reported (Grogan, 2010). Neutron scatter, especially small-angle neutron scatter, effectively blurs the measured image.…”

Section: Resultsmentioning

confidence: 84%

Recent Fast Neutron Imaging Measurements with the Fieldable Nuclear Materials Identification System1

et al. 2015

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This paper describes recent fast-neutron imaging measurements of the fieldable nuclear materials identification system (FNMIS) under development by Oak Ridge National Laboratory with National Nuclear Security Administration (NNSA-NA-22) support for possible future use in arms control and nonproliferation applications. This paper presents initial imaging measurements performed at Oak Ridge National Laboratory with a Thermo Fisher API 120 DT generator and the fast-neutron imaging module of the FNMIS.

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Section: Resultsmentioning

confidence: 84%

Recent Fast Neutron Imaging Measurements with the Fieldable Nuclear Materials Identification System1

et al. 2015

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“…We investigate the variation of the COM movement due to the mixture of beam ions, their energy loss within the titanium target, and the geometry of the experimental setup and we later quantify the resulting errors in the reconstruction. Investigations into COM corrections to API systems have been conducted previously [9], [10]. We aim to provide further analysis into the errors introduced by this effect and what factors can impact it.…”

Section: Introductionmentioning

confidence: 99%

Center-of-Mass Corrections in Associated Particle Imaging

Egan¹,

Amsellem²,

Klyde³

et al. 2022

Preprint

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Associated Particle Imaging utilizes the inelastic scattering of neutrons produced in deuterium-tritium fusion reactions to obtain 3D isotopic distributions within an object. The locations of the inelastic scattering centers are calculated by measuring the arrival time and the position of the associated particle, the alpha particle in the fusion reaction, and the arrival time of the prompt gamma created in the scattering event.While the neutron and its associated particle move in opposite directions in the center-of-mass (COM) system, in the laboratory system the angle is slightly less than 180 degrees, and the COM movement must be taken into account in the reconstruction of the scattering location. Furthermore, due to energy loss of ions in the target, the fusion reactions are produced by ions of different energies, and thus the COM velocity varies, resulting in an uncertainty in the reconstructed positions. In this paper, we analyze the COM corrections to this reconstruction by simulating the energy loss of beam ions in the target material and identifying sources of uncertainty in these corrections. We show that an average COM velocity can be used in the reconstruction and discuss errors as a function of ion beam energy, composition, and alpha detection location. When accounting for the COM effect, the mean of the reconstructed locations can be considered a systematic error leading to shift/tilt in the reconstruction. However, the distribution of reconstructed locations also have a spread that will introduce an error in the reconstruction that cannot be corrected. In this paper, we will use the known stopping powers of ions in materials and reaction cross-sections to examine this effect.

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Research and development of a dedicated collimator for 14.2 MeV fast neutrons for imaging using a D-T generator

Sabo-Napadensky¹,

Weiss-Babai²,

Gayer³

et al. 2012

J. Inst.

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One of the main problems in neutron imaging is the scattered radiation that accompanies the direct neutrons that reach the imaging detectors and affect the image quality. We have developed a dedicated collimator for 14.2 MeV fast neutrons. The collimator optimizes the amount of scattered radiation to primary neutrons that arrive at the imaging plane. We have used different materials within the collimator in order to lower the scattered radiation that arrives at the scanned object. The image quality and the signal to noise ratios that are measured show that a mixture of BORAX (Na 2 B 4 O 7 •10H 2 O) and water in the experimental beam collimator give the best results. We have used GEANT4 to simulate the collimator performance, the simulations predict the optimized material looking on the ratios of the scattered to primary neutrons that contribute in the detector. We present our experimental setup, report the results of the experimental and related simulation studies with neutrons beam generated by a 14.2 MeV D-T neutron generator.

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The Development of a Parameterized Scatter Removal Algorithm for Nuclear Materials Identification System Imaging

Cited by 3 publications

References 24 publications

Recent Fast Neutron Imaging Measurements with the Fieldable Nuclear Materials Identification System1

Recent Fast Neutron Imaging Measurements with the Fieldable Nuclear Materials Identification System1

Center-of-Mass Corrections in Associated Particle Imaging

Research and development of a dedicated collimator for 14.2 MeV fast neutrons for imaging using a D-T generator

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