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Title: Method of photon spectral analysis

Abstract

A spectroscopic method to rapidly measure the presence of plutonium in soils, filters, smears, and glass waste forms by measuring the uranium L-shell x-ray emissions associated with the decay of plutonium. In addition, the technique can simultaneously acquire spectra of samples and automatically analyze them for the amount of americium and .gamma.-ray emitting activation and fission products present. The samples are counted with a large area, thin-window, n-type germanium spectrometer which is equally efficient for the detection of low-energy x-rays (10-2000 keV), as well as high-energy .gamma. rays (>1 MeV). A 8192- or 16,384 channel analyzer is used to acquire the entire photon spectrum at one time. A dual-energy, time-tagged pulser, that is injected into the test input of the preamplifier to monitor the energy scale, and detector resolution. The L x-ray portion of each spectrum is analyzed by a linear-least-squares spectral fitting technique. The .gamma.-ray portion of each spectrum is analyzed by a standard Ge .gamma.-ray analysis program. This method can be applied to any analysis involving x- and .gamma.-ray analysis in one spectrum and is especially useful when interferences in the x-ray region can be identified from the .gamma.-ray analysis and accommodated during the x-ray analysis.

Inventors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3]
  1. (Idaho Falls, ID)
  2. (Blackfoot, ID)
  3. (Pocatello, ID)
Issue Date:
Research Org.:
EG & G IDAHO INC
OSTI Identifier:
868762
Patent Number(s):
5206174
Assignee:
EG&G Idaho, Inc. (Idaho Falls, ID) INEEL
DOE Contract Number:  
AC07-76ID01570
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; photon; spectral; analysis; spectroscopic; rapidly; measure; presence; plutonium; soils; filters; smears; glass; waste; forms; measuring; uranium; l-shell; x-ray; emissions; associated; decay; addition; technique; simultaneously; acquire; spectra; samples; automatically; analyze; amount; americium; gamma; -ray; emitting; activation; fission; products; counted; thin-window; n-type; germanium; spectrometer; equally; efficient; detection; low-energy; x-rays; 10-2000; kev; high-energy; rays; mev; 8192-; 16; 384; channel; analyzer; entire; spectrum; time; dual-energy; time-tagged; pulser; injected; input; preamplifier; monitor; energy; scale; detector; resolution; portion; analyzed; linear-least-squares; fitting; standard; applied; involving; x-; especially; useful; interferences; region; identified; accommodated; spectral analysis; waste form; fission product; fission products; especially useful; waste forms; x-ray emission; energy x-rays; ray emissions; channel analyzer; fitting technique; -ray emitting; spectroscopic method; analysis involving; low-energy x-ray; /436/250/378/

Citation Formats

Gehrke, Robert J., Putnam, Marie H., Killian, E. Wayne, Helmer, Richard G., Kynaston, Ronnie L., Goodwin, Scott G., and Johnson, Larry O. Method of photon spectral analysis. United States: N. p., 1993. Web.
Gehrke, Robert J., Putnam, Marie H., Killian, E. Wayne, Helmer, Richard G., Kynaston, Ronnie L., Goodwin, Scott G., & Johnson, Larry O. Method of photon spectral analysis. United States.
Gehrke, Robert J., Putnam, Marie H., Killian, E. Wayne, Helmer, Richard G., Kynaston, Ronnie L., Goodwin, Scott G., and Johnson, Larry O. Fri . "Method of photon spectral analysis". United States. https://www.osti.gov/servlets/purl/868762.
@article{osti_868762,
title = {Method of photon spectral analysis},
author = {Gehrke, Robert J. and Putnam, Marie H. and Killian, E. Wayne and Helmer, Richard G. and Kynaston, Ronnie L. and Goodwin, Scott G. and Johnson, Larry O.},
abstractNote = {A spectroscopic method to rapidly measure the presence of plutonium in soils, filters, smears, and glass waste forms by measuring the uranium L-shell x-ray emissions associated with the decay of plutonium. In addition, the technique can simultaneously acquire spectra of samples and automatically analyze them for the amount of americium and .gamma.-ray emitting activation and fission products present. The samples are counted with a large area, thin-window, n-type germanium spectrometer which is equally efficient for the detection of low-energy x-rays (10-2000 keV), as well as high-energy .gamma. rays (>1 MeV). A 8192- or 16,384 channel analyzer is used to acquire the entire photon spectrum at one time. A dual-energy, time-tagged pulser, that is injected into the test input of the preamplifier to monitor the energy scale, and detector resolution. The L x-ray portion of each spectrum is analyzed by a linear-least-squares spectral fitting technique. The .gamma.-ray portion of each spectrum is analyzed by a standard Ge .gamma.-ray analysis program. This method can be applied to any analysis involving x- and .gamma.-ray analysis in one spectrum and is especially useful when interferences in the x-ray region can be identified from the .gamma.-ray analysis and accommodated during the x-ray analysis.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

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