Patent US3693012A successfully refreshed from Google Patents.
US3693012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passive source of secondary radiation with a source-shield grid
Assignee: United States Atomic Energy Commission
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Filing: 1971-01-22
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Granted: 1972-09-19
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Expires: 1991-01-22
Abstract
Abstract A secondary radiation source including a source-shield grid comprised of a thin layer of radioactive source material coated on one side of a grid of radioactivity shielding material, and a sample positioned facing the radioactive material. A radiation detector is positioned facing the shielding material. Radiation from the source material is unimpeded in the direction of the sample but is blocked from the detector by the shielding material. Radiation from the source material strikes the sample and excites it to emit secondary radiation characteristic of the sample. Open spaces in the grid provide a relatively unimpeded path from the sample to the detector.
Inventors
- 👤 Robert W Schmieder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:54
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/22; G01N23/223; G21; G21G; G21G4/00; G21G4/04; G21G4/06; G01N2223/00; G01N2223/07; G01N2223/076
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The secondary source of claim 1, wherein said source material is in the form of a coating on one side of said shield.
Claim 2
Dependent Claim
22 words
The secondary source of claim 1, further including recesses in one side of said shield with said source material filling said recesses.
Claim 3
Dependent Claim
33 words
The secondary source of claim 1, wherein the side of said shield abutting said source material is flat and the edges of said source material are tapered from the edges of the shield.
Claim 4
Dependent Claim
33 words
The secondary source of claim 1, wherein the side of said shield abutting said source material is flat and the edges of said source material are offset from the edges of the shield.
Claim 5
Dependent Claim
34 words
The secondary source of claim 1, wherein the area of the open spaces in one side of said shield is greater than 90 percent of the solid area of one side of said shield.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |