Low-Mass Bias Issues in Tomographic Gamma Scanning (TGS)

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The term 'low-mass bias' has been used informally in TGS assays to describe systematic errors that arise from zero truncation in the emission image reconstruction. Emission image reconstruction algorithms used in TGS are constrained to give a non-negative result in every image voxel, so repeated assays of samples with low plutonium mass using these algorithms can give results that are high on average. We show that this problem can be avoided by formulating the TGS assay as the total net count rate for the scan times a matrix correction factor derived from the emission image, rather than as the sum ... continued below

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9 p.

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Estep, R. J. (Robert J.) January 1, 2001.

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Description

The term 'low-mass bias' has been used informally in TGS assays to describe systematic errors that arise from zero truncation in the emission image reconstruction. Emission image reconstruction algorithms used in TGS are constrained to give a non-negative result in every image voxel, so repeated assays of samples with low plutonium mass using these algorithms can give results that are high on average. We show that this problem can be avoided by formulating the TGS assay as the total net count rate for the scan times a matrix correction factor derived from the emission image, rather than as the sum of the individual emission image voxel masses. We also show that this formulation is automatically attained in reconstruction algorithms that preserve the total count rate in projections and that any reconstruction algorithm can be forced into this form by a simple normalization of the mass image.

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9 p.

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  • "Submitted to: 42nd Annual Meeting, Institute of Nuclear Materials Management (INMM), Indian Wells, CA, July 15-19, 2001"

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  • Report No.: LA-UR-01-3764
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975632
  • Archival Resource Key: ark:/67531/metadc927504

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  • January 1, 2001

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:22 p.m.

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Estep, R. J. (Robert J.). Low-Mass Bias Issues in Tomographic Gamma Scanning (TGS), article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc927504/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.