USH922H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for analyzing materials using x-ray fluorescence
Assignee: United States Department of the Navy
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Filing: 1988-08-01
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Granted: 1991-05-07
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Expires: 2008-08-01
Abstract
Abstract A method of identifying the presence, and amount, of elemental constituents in a material. The method uses an apparatus known for use in measuring extended x-ray absorption fine structure, and adapts it to the measurement of x-ray appearance potential in a manner to yield both qualitative and quantitative information about the elemental constituents of the material. The source of x-rays can be a synchrotron, which, because of its high power output, increases the speed and sensitivity of the measurements, permitting the use of less sensitive x-ray detectors to yield statistically significant data.
Inventors
- 👤 Johnny P. Kirkland
- 👤 Wm. Timothy Ehm
- 👤 John V. Gilfrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:56
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/22; G01N23/223; G01N2223/00; G01N2223/07; G01N2223/076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A method of identifying at least one elemental; constituent of a material sample, said method comprising steps for: (a) exposing said sample for a preselected time to a substantially monochromatic x-ray beam of preselected frequency; (b) measuring the amount of fluorescence emitted by said sample into a preselected solid angle during said preselected time responsive to said step for exposing; (c) measuring the amount of energy delivered to said sample in said preselected time by step (a); (d) varying the frequency of said monochromatic x-ray beam; (e) repeating steps (a) through (d) a sufficient number of times to identify an absorption edge transition of said elemental constituent of said sample; (f) measuring the change of magnitude of said amount of fluorescence at said absorption edge; (g) using said change of magnitude to calculate the amount of said elemental constituent of said sample.
Claim 2
Independent Claim
142 words
A method of identifying at least one elemental; constituent of a material sample, said method comprising steps for: (a) exposing said sample for a preselected time to a substantially monochromatic x-ray beam of preselected frequency; (b) measuring the amount of fluorescence emitted by said sample into a preselected solid angle during said preselected time responsive to said step for exposing; (c) measuring the amount of energy delivered to said sample in said preselected time by step (a); (d) varying the frequency of said monochromatic x-ray beam; (e) repeating steps (a) through (d) a sufficient number of times to identify an absorption edge transition of said elemental constituent of said sample; (f) measuring the change of magnitude of said amount of fluorescence at said absorption edge; (g) using said change of magnitude to calculate the amount of said elemental constituent of said sample.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |