Patent US4956557A successfully refreshed from Google Patents.
US4956557A
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Dosimeter for ionizing radiation
Assignee: Optische Industrie de Oude Delft NV
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Filing: 1989-02-15
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Granted: 1990-09-11
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Expires: 2009-02-15
Abstract
Abstract There is disclosed a dosimeter to be used in connection with slit radiography and comprised of a gas filled chamber with one side wall provided with a plurality of X-ray transparent strip-like electrodes extending substantially transversely to a longitudinal direction of the oblong-shaped casing and another side wall provided with wire electrodes extending parallel to such longitudinal direction of the oblong-shaped casing wherein each of the strip-like electrodes generates a signal representative of intensity of ionizing radiation and wherein the strip-like electrodes are divided into a number of groups, signals from the strip-like electrodes belonging to each group are combined to provide a control signal for a respective attenuation element.
Inventors
- 👤 Hugo Vlasbloem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:29
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/02
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
111 words
A dosimeter for ionizing radiation comprising a casing defining a gas-filled measuring chamber in which there is provided electrode elements and wherein said casing is provided with at least one entry window for the ionizing radiation, characterized in that said casing is of an oblong shape defining an oblong measuring chamber, said casing including at least two opposed side walls of a material transparent to ionizing radiation, an inner surface of one side wall being provided with wire electrodes extending essentially longitudinally to said oblong measuring chamber and an inner surface of another side wall being provided with a plurality of strip-like electrode elements essentially transversely to said oblong measuring chamber.
Claim 2
Dependent Claim
111 words
A dosimeter for ionizing radiation comprising a casing defining a gas-filled measuring chamber in which there is provided electrode elements and wherein said casing is provided with at least one entry window for the ionizing radiation, characterized in that said casing is of an oblong shape defining an oblong measuring chamber, said casing including at least two opposed side walls of a material transparent to ionizing radiation, an inner surface of one side wall being provided with wire electrodes extending essentially longitudinally to said oblong measuring chamber and an inner surface of another side wall being provided with a plurality of strip-like electrode elements essentially transversely to said oblong measuring chamber.
Claim 3
Dependent Claim
21 words
The dosimeter according to claim 1 wherein said casing includes an oblong frame mounted in gas-tight relationship to said side walls.
Claim 4
Dependent Claim
13 words
The dosimeter according to claim 2 wherein said casing is manufactured from glass.
Claim 5
Dependent Claim
13 words
The dosimeter according to claim 2 wherein said casing is manufactured from acrylic.
Claim 6
Dependent Claim
20 words
The dosimeter according to claim 1 and further including a guard electrode surrounding said wire electrodes on said side wall.
Claim 7
Dependent Claim
25 words
The dosimeter according to claim 1 wherein said strip-like electrodes are formed by depositing a layer of conducting material in a required pattern by evaporation.
Claim 8
Dependent Claim
25 words
The dosimeter according to claim 1 wherein said strip-like electrodes are formed by depositing a layer of metal in a desired pattern by sputtering technique.
Claim 9
Dependent Claim
16 words
The dosimeter according to claim 6 or 7 wherein said strip=like electrodes are formed of nickel.
Claim 10
Dependent Claim
25 words
The dosimeter according to claim 1 wherein a strip of each side wall extends beyond said casing and said electrodes are provided with connecting sections.
Claim 11
Dependent Claim
15 words
The dosimeter according to claim 9 wherein each strip is constructed as a connecting connector.
Claim 12
Dependent Claim
33 words
The dosimeter according to claim 9 or 10 wherein a strip of each side wall defines a recess with said casing extending lengthwise along outermost edges of said frame diagonally opposite one another.
Claim 13
Dependent Claim
41 words
The dosimeter according to claim 1 wherein said casing includes a side wall having a hole for inserting a tube for evacuating said oblong measuring chamber and wherein said tube is sealed after introduction of gas into said oblong measuring chamber.
Claim 14
Dependent Claim
15 words
The dosimeter according to claim 1 wherein said oblong measuring chamber is filled with xenon.
Claim 15
Dependent Claim
23 words
The dosimeter according to claim 13 wherein potential difference between said wire electrodes and said strip-like electrode elements during operation prevent gas multiplication.
Claim 16
Dependent Claim
24 words
The dosimeter according to claim 1 wherein said strip-like electrode elements extend obliquely with respect to said transverse direction of said oblong measuring chamber.
Claim 17
Independent Claim
222 words
An apparatus for slit radiography, which comprises: an X-ray source; an X-ray detector collecting radiation passing through a body to be radiographed; a slit diaphragm positioned between said X-ray source and said body for forming a planar X-ray beam; a plurality of attenuating elements positioned along said slit diaphragm forming a plurality of attenuating sections; means for scanning said body with said planar X-ray beam; a detection member disposed in a path of said planar X-ray beam to measure ionizing radiation comprised of an oblong-shaped casing defining a gas-filled chamber said casing having at least two side walls formed of a material transparent to ionizing radiation, one side wall having a plurality of strip-like electrodes extending transversely to a longitudinal direction of said oblong-shaped casing, another side wall having wire electrodes extending in said longitudinal direction, said electrode capable of being connected to a source of electromotive force, each of said strip-like electrodes generating a signal representative of intensity of ionizing radiation, a group of said strip-like electrodes corresponding to a respective attenuating element; means for moving said detection member in synchronization with said means for scanning said body with said planar X-ray beam; and means for simultaneously controlling each of said attenuating elements during scanning of said body in response to electric signals produced at respective groups of said strip-like electrodes.
Claim 18
Independent Claim
222 words
An apparatus for slit radiography, which comprises: an X-ray source; an X-ray detector collecting radiation passing through a body to be radiographed; a slit diaphragm positioned between said X-ray source and said body for forming a planar X-ray beam; a plurality of attenuating elements positioned along said slit diaphragm forming a plurality of attenuating sections; means for scanning said body with said planar X-ray beam; a detection member disposed in a path of said planar X-ray beam to measure ionizing radiation comprised of an oblong-shaped casing defining a gas-filled chamber said casing having at least two side walls formed of a material transparent to ionizing radiation, one side wall having a plurality of strip-like electrodes extending transversely to a longitudinal direction of said oblong-shaped casing, another side wall having wire electrodes extending in said longitudinal direction, said electrode capable of being connected to a source of electromotive force, each of said strip-like electrodes generating a signal representative of intensity of ionizing radiation, a group of said strip-like electrodes corresponding to a respective attenuating element; means for moving said detection member in synchronization with said means for scanning said body with said planar X-ray beam; and means for simultaneously controlling each of said attenuating elements during scanning of said body in response to electric signals produced at respective groups of said strip-like electrodes.
Claim 19
Dependent Claim
26 words
The apparatus for slit radiography as defined in claim 16 wherein said casing includes an oblong frame mounted in a gas-tight manner between said side walls.
Claim 20
Dependent Claim
17 words
The apparatus for slit radiography as defined in claim 17 wherein said casing is manufactured from glass.
Claim 21
Dependent Claim
17 words
The apparatus for slit radiography as defined in claim 17 wherein said casing is manufactured from acrylic.
Claim 22
Dependent Claim
20 words
The apparatus for slit radiography as defined in claim 16 and further including a guard electrode surrounding said wire electrodes.
Claim 23
Dependent Claim
29 words
The apparatus for slit radiography as defined in claim 16 wherein said strip-like electrodes are formed by depositing a layer of conducting material in a required pattern by evaporation.
Claim 24
Dependent Claim
18 words
The apparatus for slit radiography as defined in claim 21 wherein said strip-like electrodes are formed of nickel.
Claim 25
Dependent Claim
31 words
The apparatus for slit radiography as defined in claim 16 wherein said strip-like electrodes are formed by depositing a layer of metal in a desired pattern by means of sputtering technique.
Claim 26
Dependent Claim
44 words
The apparatus for slit radiography as defined in claim 23 characterized in that said electrodes are formed of nickel. 32. The apparatus for slit radiography as defined in claim 16 wherein said detection member is mounted obliquely with respect to direction of scanning movement.
Claim 27
Dependent Claim
29 words
The apparatus for slit radiography as defined in claim 16 wherein a strip of each side wall extends beyond said casing and said electrodes are provided with connecting sections.
Claim 28
Dependent Claim
19 words
The apparatus for slit radiography as defined in claim 25 wherein each strip is constructed as a connecting connector.
Claim 29
Dependent Claim
41 words
The apparatus for slit radiography as defined in claim 25 or 26 wherein a strip of each side wall defines a recess with said casing extending essentially lengthwise of said frame along outermost edges of said frame diagonally opposite one another.
Claim 30
Dependent Claim
43 words
The apparatus for slit radiography as defined in claim 16 wherein said casing includes a side wall having a hole for inserting a tube for evacuating said measuring chamber and wherein said tube is sealed after introduction of gas into said measuring chamber.
Claim 31
Dependent Claim
18 words
The apparatus for slit radiography as defined in claim 16 wherein said measuring chamber is filled with xenon.
Claim 32
Dependent Claim
27 words
The apparatus for slit radiography as defined in claim 29 wherein said potential difference between said wire electrodes and said strip-like electrodes during operation prevent gas multiplication.
Claim 33
Dependent Claim
27 words
The apparatus for slit radiography as defined in claim 16 wherein said strip-like electrodes extend obliquely with respect to a transverse direction of said oblong measuring chamber.
Claim 34
Dependent Claim
24 words
The apparatus for slit radiography as defined in claim 16 wherein said detection member is mounted obliquely with respect to direction of scanning movement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |