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Practical Gamma Spectroscopy Assay Techniques for Large Volume Low-Level Waste Boxes.

DE2004829678

Publication Date	2002
Personal Author	Myers, S. C.; Gruetzmacher, K.; Sheffing, C. C.; Gallegos, L.; Bustos, R.
Page Count	12
Abstract	A study was conducted at the Los Alamos National Laboratory (LANL) to evaluate the performance of the SNAP (Spectral Nondestructive Assay Platform) analytical software for measurements of known standards in large metal waste boxes (2.5 m3 volume). The trials were designed to test the accuracy and variance of the analytical results for low-density combustible matrices and higher-density metal matrices at two discrete gamma-ray energies: 121.78 keV and 411.12 keV. For both matrix types the measurement method that produced the most accurate results with the lowest associated standard deviation involved combining four individual measurements taken at the geometric center of each of the box's four vertical sides. With this method the overall bias and the standard deviation amongst 24 individual results for the 121.78 keV and 411.12 keV gamma rays were as follows: 3.38% (+ or = 20.19%) and 3.68% (+ or = 15.47%) for the combustible matrix and 37.88% (+ or = 67.64%) and 9.38% (+ or = 33.15%) for the metal matrix. The persistent positive bias from measurements of the metal box is believed to be a result of a nonhomogenously distributed matrix.
Keywords	Gamma spectroscopy Software Evaluation Nondestructive testing Measurements Accuracy Standards Los Alamos National Laboratory (LANL) Spectral Nondestructive Assay Platform (SNAP) Combustible matrices Metal matrices Assay methods
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Los Alamos National Lab., NM.; New Mexico Inst. of Mining and Technology, Socorro.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with New Mexico Inst. of Mining and Technology, Socorro. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200511

Practical Gamma Spectroscopy Assay Techniques for Large Volume Low-Level Waste Boxes.

Practical Gamma Spectroscopy Assay Techniques for Large Volume Low-Level Waste Boxes.
DE2004829678

Publication Date	2002
Personal Author	Myers, S. C.; Gruetzmacher, K.; Sheffing, C. C.; Gallegos, L.; Bustos, R.
Page Count	12
Abstract	A study was conducted at the Los Alamos National Laboratory (LANL) to evaluate the performance of the SNAP (Spectral Nondestructive Assay Platform) analytical software for measurements of known standards in large metal waste boxes (2.5 m3 volume). The trials were designed to test the accuracy and variance of the analytical results for low-density combustible matrices and higher-density metal matrices at two discrete gamma-ray energies: 121.78 keV and 411.12 keV. For both matrix types the measurement method that produced the most accurate results with the lowest associated standard deviation involved combining four individual measurements taken at the geometric center of each of the box's four vertical sides. With this method the overall bias and the standard deviation amongst 24 individual results for the 121.78 keV and 411.12 keV gamma rays were as follows: 3.38% (+ or = 20.19%) and 3.68% (+ or = 15.47%) for the combustible matrix and 37.88% (+ or = 67.64%) and 9.38% (+ or = 33.15%) for the metal matrix. The persistent positive bias from measurements of the metal box is believed to be a result of a nonhomogenously distributed matrix.
Keywords	Gamma spectroscopy Software Evaluation Nondestructive testing Measurements Accuracy Standards Los Alamos National Laboratory (LANL) Spectral Nondestructive Assay Platform (SNAP) Combustible matrices Metal matrices Assay methods
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Los Alamos National Lab., NM.; New Mexico Inst. of Mining and Technology, Socorro.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with New Mexico Inst. of Mining and Technology, Socorro. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200511