US3832564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation absorber and intensity collimator unit
Assignee: United States Department of the Navy
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Filing: 1973-01-31
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Granted: 1974-08-27
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Expires: 1993-01-31
Abstract
Abstract A radiation absorber which automatically and/or digitally controls the intensity of a radiation source by providing an absorbent measured fixed path for the radiation beam to travel, by the use of a cylindrical helically shaped step wedge to control the intensity of the radiation emitted from the radiation source. By changing the angle of cylindrical shaped step wedge, the thickness of the material in the path of the beam emitted from the source changes, thereby changing the flux of the beam.
Inventors
- 👤 L Hall
- 👤 H Heffan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:12
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A device for absorbing radiation from a radiation source generating a radiation beam and comprising: a. a collimator for collimating said radiation from said source; b. a means for continuously uniformly varying the intensity of the collimated radiation emitted from said source and said collimator from maximum intensity to minimum intensity; and a minimum intensity to maximum intensity; and c. said flux varying means having a surface area of variable thickness so that when said means is varied the path of the radiation beam emitted from said source is varied in intensity due to the continuously variable thickness of said means.
Claim 2
Independent Claim
101 words
A device for absorbing radiation from a radiation source generating a radiation beam and comprising: a. a collimator for collimating said radiation from said source; b. a means for continuously uniformly varying the intensity of the collimated radiation emitted from said source and said collimator from maximum intensity to minimum intensity; and a minimum intensity to maximum intensity; and c. said flux varying means having a surface area of variable thickness so that when said means is varied the path of the radiation beam emitted from said source is varied in intensity due to the continuously variable thickness of said means.
Claim 3
Dependent Claim
25 words
The device recited in claim 1 wherein said means is at least one rotatable cylindrical helically shaped wedge located adjacent said collimator having an aperture.
Claim 4
Dependent Claim
19 words
The device recited in claim 2 wherein said collimator aperture is juxtaposed in the path of the radiation source.
Claim 5
Dependent Claim
14 words
The device recited in claim 3 wherein said collimator aperture is a variable aperture.
Claim 6
Dependent Claim
17 words
The device recited in claim 4 wherein variable aperture is comprised of inserts with varying aperture sizes.
Claim 7
Dependent Claim
14 words
The device recited in claim 2 wherein said variable wedge further includes a slot.
Claim 8
Dependent Claim
20 words
The device recited in claim 6 wherein variable wedge further includes a means for moving said wedge and said slot.
Claim 9
Dependent Claim
21 words
The device recited in claim 7 wherein said slot intermittently increases and decreases the radiation emitted from the radiation source collimator.
Claim 10
Dependent Claim
23 words
The device recited in claim 8 wherein said collimator further includes an aperture located within the collimator and located juxtaposed to said source.
Claim 11
Dependent Claim
17 words
The device recited in claim 9 wherein said collimator aperture includes a means for varying the aperture.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |