Transport simulation and image reconstruction for fast-neutron detection of explosives and narcotics

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Fast-neutron inspection techniques show considerable promise for explosive and narcotics detection. A key advantage of using fast neutrons is their sensitivity to low-Z elements (carbon, nitrogen, and oxygen), which are the primary constituents of these materials. We are currently investigating two interrogation methods in detail: Fast-Neutron Transmission Spectroscopy (FNTS) and Pulsed Fast-Neutron Analysis (PFNA). FNTS is being studied for explosives and narcotics detection in luggage and small containers for which the transmission ratio is greater than about 0.01. The Monte-Carlo radiation transport code MCNP is being used to simulate neutron transmission through a series of phantoms for a few (3-5) ... continued below

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12 p.

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Micklich, B.J.; Fink, C.L. & Sagalovsky, L. July 1, 1995.

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Description

Fast-neutron inspection techniques show considerable promise for explosive and narcotics detection. A key advantage of using fast neutrons is their sensitivity to low-Z elements (carbon, nitrogen, and oxygen), which are the primary constituents of these materials. We are currently investigating two interrogation methods in detail: Fast-Neutron Transmission Spectroscopy (FNTS) and Pulsed Fast-Neutron Analysis (PFNA). FNTS is being studied for explosives and narcotics detection in luggage and small containers for which the transmission ratio is greater than about 0.01. The Monte-Carlo radiation transport code MCNP is being used to simulate neutron transmission through a series of phantoms for a few (3-5) projection angles and modest (2 cm) resolution. Areal densities along projection rays are unfolded from the transmission data. Elemental abundances are obtained for individual voxels by tomographic reconstruction, and these reconstructed elemental images are combined to provide indications of the presence or absence of explosives or narcotics. PFNA techniques are being investigated for detection of narcotics in cargo containers because of the good penetration of the fast neutrons and the low attenuation of the resulting high-energy gamma-ray signatures. Analytic models and Monte-Carlo simulations are being used to explore the range of capabilities of PFNA techniques and to provide insight into systems engineering issues. Results of studies from both FNTS and PFNA techniques are presented.

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12 p.

Notes

OSTI as DE95013750

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  • Optics for environmental and public safety, Munich (Germany), 19-23 Jun 1995

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  • Other: DE95013750
  • Report No.: ANL/TD/CP--86675
  • Report No.: CONF-9506183--3
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 90718
  • Archival Resource Key: ark:/67531/metadc794144

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  • July 1, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 6, 2016, 2:57 p.m.

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Micklich, B.J.; Fink, C.L. & Sagalovsky, L. Transport simulation and image reconstruction for fast-neutron detection of explosives and narcotics, article, July 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc794144/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.