US4583020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization chamber making it possible to measure high energy gamma radiation
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1983-07-11
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Granted: 1986-04-15
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Expires: 2003-07-11
Abstract
Abstract Ionization chamber making it possible to measure high energy gamma radiation, wherein it comprises a tight cylindrical enclosure containing an ionizable gas, and several coaxial cylindrical electrodes, which are insulated from one another, and are positioned within the enclosure and are raised to different potentials, so as to produce an electrical field in the enclosure, whereby the innermost electrode is formed by a solid cylinder, the outermost electrode is formed by a solid tube and the intermediate electrodes are formed by a perforated tube.
Inventors
- 👤 Francois Cliquet
- 👤 Pierre Boulay
- 👤 Jean Duchene
- 👤 Marc Merelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:00
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
An ionization chamber making it possible to measure high energy gamma radiation, wherein it comprises a tight cylindrical enclosure containing an ionizable gas, and several coaxial cylindrical electrodes, which are insulated from one another, and are positioned within the enclosure and are raised to different potentials, so as to produce an electrical field in the enclosure, whereby the innermost electrode is formed by a solid cylinder, the outermost electrode is formed by a solid tube and the intermediate electrodes are formed by a perforated tube.
Claim 2
Dependent Claim
85 words
An ionization chamber making it possible to measure high energy gamma radiation, wherein it comprises a tight cylindrical enclosure containing an ionizable gas, and several coaxial cylindrical electrodes, which are insulated from one another, and are positioned within the enclosure and are raised to different potentials, so as to produce an electrical field in the enclosure, whereby the innermost electrode is formed by a solid cylinder, the outermost electrode is formed by a solid tube and the intermediate electrodes are formed by a perforated tube.
Claim 3
Dependent Claim
18 words
An ionization chamber according to claim 1, wherein the perforated electrode has a transparency between 30 and 40%.
Claim 4
Dependent Claim
30 words
An ionization chamber according to claim 1, wherein the different electrodes have clearances between them such that the electrical field prevailing in the enclosure is substantially uniform throughout the latter.
Claim 5
Dependent Claim
12 words
An ionization chamber according to claim 1, wherein there are five electrodes.
Claim 6
Dependent Claim
19 words
An ionization chamber according to claim 1, wherein the ionizable gas contains 98 to 99% by weight of xenon.
Claim 7
Dependent Claim
19 words
An ionization chamber according to claim 1, wherein the pressure of gas is between 8.8 and 9.2 bars absolute.
Claim 8
Dependent Claim
42 words
An ionization chamber according to claim 1, wherein one of the ends of the electrodes is fixed, whilst the other end is maintained in position by first elastic means permitting an axial displacement and by second elastic means permitting a radial displacement.
Claim 9
Dependent Claim
26 words
An ionization chamber according to claim 7, wherein it comprises third elastic means, which act axially and solely on the other end of the intermediate electrodes.
Claim 10
Dependent Claim
26 words
An ionization chamber according to claim 1, wherein the intermediate electrodes are in each case formed by perforated metal sheets, which are rolled and welded together.
Claim 11
Dependent Claim
32 words
An ionization chamber according to claim 1, making it possible to measure gamma radiation with an energy level of approximately 6 MeV, wherein the enclosure and electrodes are made from stainless steel.
Claim 12
Dependent Claim
33 words
An ionization chamber according to claim 1, making it possible to measure gamma radiation having an energy level of approximately 6 MeV wherein the enclosure has a thickness between 3 and 4 mm.
References Cited (Backward Citations)
US2440167A
Cited
US2499489A
Cited
US2617955A
Cited
US2858465A
Cited
US2875343A
Cited
FR1560320A
Cited
FR2425147A1
Cited
US4379248A
Cited
US4289967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |