NDLI: Imaging of heterogeneous materials by prompt gamma-ray neutron activation analysis

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Imaging of heterogeneous materials by prompt gamma-ray neutron activation analysis

Content Provider	United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV)
Author	Staples, P. Prettyman, T. Lestone, J.
Organization	Los Alamos National Lab., NM (United States)
Abstract	The authors have used a tomographic gamma scanner (TGS) to produce tomographic prompt gamma-ray neutron activation analysis imaging (PGNAA) of heterogeneous matrices. The TGS was modified by the addition of graphite reflectors that contain isotopic neutron sources for sample interrogation. The authors are in the process of developing the analysis methodology necessary for a quantitative assay of large containers of heterogeneous material. This nondestructive analysis (NDA) technique can be used for material characterization and the determination of neutron assay correction factors. The most difficult question to be answered is the determination of the source-to-sample coupling term. To assist in the determination of the coupling term, the authors have obtained images for a range of sample that are very well characterized, such as, homogenous pseudo one-dimensional samples to three-dimensional heterogeneous samples. They then compare the measurements to MCNP calculations. For an accurate quantitative measurement, it is also necessary to determine the sample gamma-ray self attenuation at higher gamma-ray energies, namely pair production should be incorporated into the analysis codes.
Sponsorship	USDOE Assistant Secretary for Management and Administration, Washington, DC (United States)
Related Links	https://www.osti.gov/biblio/677021
Page Count	3
File Format	PDF
Language	English
Publisher Date	1998-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	CHEMISTRY NUCLEAR FUELS NONDESTRUCTIVE ANALYSIS WASTE FORMS NEUTRON ACTIVATION ANALYSIS PROMPT GAMMA RADIATION NEUTRON REFLECTORS DATA ANALYSIS M CODES
Content Type	Text
Resource Type	Article

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