US3864570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low energy x-ray detector
Assignee: Individual
•
Filing: 1973-09-24
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Granted: 1975-02-04
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Expires: 1993-09-24
Abstract
Abstract A detector for low energy x-rays employs a lithium doped silicon crystal and an FET preamplifier cooled cryogenically. In order to avoid contamination of the crystal and FET by oil vapors and other condensates produced during evacuation of an instrument for producing soft x-rays, the detector is provided with two ultrathin windows spaced apart and defining a space which connects with the instrument. Thus, while the instrument is evacuated air is also withdrawn from the space between the windows, and when air is introduced, the air flows through a filter prior to entering that space. The air is thus filtered to remove contaminants. The windows consist of thin films of a synthetic resin which transmit low energy x-rays substantially without attentuation but because they are so thin, they are unable to withstand any substantial pressure.
Inventors
- 👤 William P Zingaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:19
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/24; G01T1/244
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A detector for low energy x-rays adapted to operate in an evacuable chamber in which said x-rays are produced comprising a contaminant-sensitive element responsive at cryogenic temperatures to low-energy x-rays, a pair of spaced x-ray permeable membranes separating said x-rays responsive element from the interior of said chamber, said membranes defining a space which is connected with the interior of said chamber through a passageway, filter means within said passage for removing foreign materials which are capable of contaminating said x-ray-responsive element and rendering said element inoperative, and means in contact with said x-ray responsive element to maintain said x-rays responsive element at a cryogenic temperature.
Claim 2
Dependent Claim
106 words
A detector for low energy x-rays adapted to operate in an evacuable chamber in which said x-rays are produced comprising a contaminant-sensitive element responsive at cryogenic temperatures to low-energy x-rays, a pair of spaced x-ray permeable membranes separating said x-rays responsive element from the interior of said chamber, said membranes defining a space which is connected with the interior of said chamber through a passageway, filter means within said passage for removing foreign materials which are capable of contaminating said x-ray-responsive element and rendering said element inoperative, and means in contact with said x-ray responsive element to maintain said x-rays responsive element at a cryogenic temperature.
Claim 3
Dependent Claim
26 words
A detector for low energy x-rays as claimed in claim 1 in which the membranes are ultra-thin synthetic resin films covered with a thin metal coating.
Claim 4
Dependent Claim
25 words
A detector for low energy x-rays as claimed in claim 2 in which the synthetic resin film is coated with a thin layer of beryllium.
Claim 5
Dependent Claim
21 words
A detector for low energy x-rays as claimed in claim 1 in which the x-ray responsive element is lithium doped silicon.
Claim 6
Dependent Claim
30 words
A detector for low energy x-rays as claimed in claim 4 in which the means for maintaining the x-ray responsive element at a cryogenic temperature is tube containing liquid nitrogen.
Claim 7
Dependent Claim
51 words
A detector for low energy x-rays as claimed in claim 1 including a housing which is insErtable into said evacuable chamber and which is provided with a passageway connecting said evacuable space with the space between said membranes one of which is an end-wall of said housing within said evacuable chamber.
Claim 8
Dependent Claim
19 words
A detector for low energy x-rays as claimed in claim 2 in which the synthetic resin film is polypropylene.
Claim 9
Dependent Claim
19 words
A detector for low energy x-rays as claimed in claim 3 in which the synthetic resin film is polyproylene.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |