US3790794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absolute calorimetric dosimeter
Assignee: United States Department of the Navy
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Filing: 1972-12-21
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Granted: 1974-02-05
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Expires: 1992-12-21
Abstract
Abstract A device for determining radiation dose by measuring a change of temperature in a material due to incident radiation on the material.
Inventors
- 👤 K Murray
- 👤 F Attix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:24
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A calorimetric-radiation dosimeter for measuring radiation dose of incident radiation, which comprises; a solid first sphere of heat conductive material, a hollow second sphere of the same material as said first sphere surrounding said first sphere concentric therewith and in spaced relationship thereto, a passage through said second sphere to the inside thereof, a passage into said first sphere to the center thereof, said passage in alignment with said passage through said second sphere, a temperature sensing means secured at the center of said first sphere for detection of any temperature change in said first sphere due to incident radiation.
Claim 2
Dependent Claim
100 words
A calorimetric-radiation dosimeter for measuring radiation dose of incident radiation, which comprises; a solid first sphere of heat conductive material, a hollow second sphere of the same material as said first sphere surrounding said first sphere concentric therewith and in spaced relationship thereto, a passage through said second sphere to the inside thereof, a passage into said first sphere to the center thereof, said passage in alignment with said passage through said second sphere, a temperature sensing means secured at the center of said first sphere for detection of any temperature change in said first sphere due to incident radiation.
Claim 3
Dependent Claim
24 words
A calorimeter-radiation dosimeter as claimed in claim 1; in which, said temperature sensing sensing means resistivity varies in a reproducible manner with temperature change.
Claim 4
Dependent Claim
40 words
A calorimeter-radiation dosimeter as claimed in claim 1; wherein; said first and second spheres are made of a material selectd from a group consisting of silicon, aluminum, graphite, as well as other pure material whose specific heat is known accurately.
Claim 5
Dependent Claim
17 words
A calorimeter-radiation dosimeter as claimed in claim 1; in which, said first and second spheres are silicon.
Claim 6
Dependent Claim
32 words
A calorimeter-radiation dosimeter as claimed in claim 4; which includes; a thin metal shell surrounding said second sphere for shielding against radio frequency interference to the measurement of said temperature sensing means.
Claim 7
Dependent Claim
22 words
A calorimeter-radiation dosimeter as claimed in claim 5; which includes, a thermal insulator transport to incident radiation surrounding said ratio frequency shield.
Claim 8
Dependent Claim
29 words
A calorimeter-radiAtion dosimeter as claimed in claim 2; which includes, a temperature measuring electrical circuit electrically connected to said temperature sensing means, and an indicator to indicate radiation dose.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |