Chemistry: analytical and immunological testing – Including use of radioactive properties – Dosage determination of high energy radiation
Patent
1992-09-24
1993-04-27
Housel, James C.
Chemistry: analytical and immunological testing
Including use of radioactive properties
Dosage determination of high energy radiation,
378 45, 250253, G01N 2300, G01N 23223
Patent
active
052061744
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.
REFERENCES:
patent: 3792276 (1974-02-01), Toman et al.
patent: 4456823 (1984-06-01), McFarland et al.
patent: 4582670 (1986-04-01), Leon et al.
Gehrke Robert J.
Goodwin Scott G.
Helmer Richard G.
Johnson Larry O.
Killian E. Wayne
Bhat N.
EG&G Idaho, Inc.
Housel James C.
Kirsch Alan D.
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