US3622787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for making visible and/or registering {65 -quanta densities or two-dimensional {62 -particle density distributions
Assignee: Linde Sverige AB
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Filing: 1969-06-02
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Granted: 1971-11-23
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Expires: 1989-06-02
Abstract
Abstract A device for making visible and/or registering the flux density of gamma-quanta or the two-dimensional density distribution of beta-particles includes a gas and vapor-filled spark discharge chamber with a flat cathode, a flat, grid-form anode and a gridform auxiliary electrode arranged therein. The cathode is positioned parallel to and spaced from the anode and the auxiliary electrode is located therebetween. A high-voltage source is connected to the electrodes and an integrating recorder registers the pattern of the spark discharges between the auxiliary electrode and the anode such as caused by entering radiation. The auxiliary electrode is galvanically connected to the cathode and is spaced therefrom a distance such that the electron cloud which triggers the spark discharge is not attenuated by electron attachment in the space between cathode and auxiliary electrode.
Inventors
- 👤 Floris Timmer
- 👤 A D Alphen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:49
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/10; A; A61; A61B; A61B6/00; A61B6/42; A61B6/4208; A61B6/4258
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
219 words
A device for making visible invisible radiation, such as the flux density of gamma-quanta or the two-dimensional density distribution of beta-particles, comprising a spark discharge chamber filled with a mixture of gases and vapors, a substantially flat cathode mounted within said chamber, a flat anode constructed of a gauze material and positioned parallel to said cathode, an auxiliary electrode constructed of a gauze material and positioned between said anode and said cathode, a high voltage source connected to said cathode, to said anode and to said auxiliary electrode, and an integrating recorder for providing an indication of the pattern of the spark discharges between said auxiliary electrode and said anode caused by the entry of radiation into said chamber, said auxiliary electrode being galvanically connected to said cathode, said anode being secured to a first metal ring and said auxiliary electrode being secured to a second metal ring, said device further comprising a ringlike insulating support including a portion having opposed, substantially flat surfaces, the thickness of said portion gradually increasing in a narrow area around the central opening provided by said ring-like support, said first and second rings acting to stretch said anode and said auxiliary electrode along said opposed surfaces, respectively; and a material of high conductivity located on upper and lower surfaces of said supporting unit.
Claim 2
Independent Claim
219 words
A device for making visible invisible radiation, such as the flux density of gamma-quanta or the two-dimensional density distribution of beta-particles, comprising a spark discharge chamber filled with a mixture of gases and vapors, a substantially flat cathode mounted within said chamber, a flat anode constructed of a gauze material and positioned parallel to said cathode, an auxiliary electrode constructed of a gauze material and positioned between said anode and said cathode, a high voltage source connected to said cathode, to said anode and to said auxiliary electrode, and an integrating recorder for providing an indication of the pattern of the spark discharges between said auxiliary electrode and said anode caused by the entry of radiation into said chamber, said auxiliary electrode being galvanically connected to said cathode, said anode being secured to a first metal ring and said auxiliary electrode being secured to a second metal ring, said device further comprising a ringlike insulating support including a portion having opposed, substantially flat surfaces, the thickness of said portion gradually increasing in a narrow area around the central opening provided by said ring-like support, said first and second rings acting to stretch said anode and said auxiliary electrode along said opposed surfaces, respectively; and a material of high conductivity located on upper and lower surfaces of said supporting unit.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |