Patent US3701901A successfully refreshed from Google Patents.
US3701901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phototubes for scintillation detector
Assignee: Elscint Ltd
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Filing: 1970-01-07
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Granted: 1972-10-31
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Expires: 1990-01-07
Abstract
Abstract The invention relates to phototubes and in particular to photo multiplier tubes such as those associated with scintillation crystals and which are provided with an array of conductor elements juxtaposed with respect to the photo cathode of the tube and which when subjected to voltage pulsing in a scanning sequence are capable of providing information concerning the spatial distribution of light incident on the photo cathode.
Inventors
- 👤 Albert Suhami
- 👤 Benjamin Sabbah
- 👤 Dan Inbar
- 👤 Artzi Yarom
- 👤 Dan Ben-Zeev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:55
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1645; H01J29/00; H01J29/02; H01J29/10; H01J29/36
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
106 words
An assembly comprising: a. scintillator crystal means adapted to be excited by spatially distributed radiation events to produce correspondingly distributed light events that provide photoelectrons; b. a phototube having a photocathode adapted to receive said photoelectrons; and c. a plurality of electrically separate conductors arrayed in juxtaposition to said photocathode each of said conductors being associated with an elemental area of said photocathode so that the flow of current in a selected one of said conductors during the occurrence of a light event causes the resultant field to interfere wIth the flow of photoelectrons to the elemental area associated with said selected one of said conductors.
Claim 2
Dependent Claim
106 words
An assembly comprising: a. scintillator crystal means adapted to be excited by spatially distributed radiation events to produce correspondingly distributed light events that provide photoelectrons; b. a phototube having a photocathode adapted to receive said photoelectrons; and c. a plurality of electrically separate conductors arrayed in juxtaposition to said photocathode each of said conductors being associated with an elemental area of said photocathode so that the flow of current in a selected one of said conductors during the occurrence of a light event causes the resultant field to interfere wIth the flow of photoelectrons to the elemental area associated with said selected one of said conductors.
Claim 3
Dependent Claim
15 words
An assembly according to claim 1 wherein said array of conductors form a cross grid.
Claim 4
Dependent Claim
18 words
An assembly according to claim 1 wherein said conductors are interposed between said crystal means and said photocathode.
Claim 5
Dependent Claim
17 words
An assembly according to claim 1 wherein a gap exists between said crystal means and said photocathode.
Claim 6
Dependent Claim
27 words
An assembly according to claim 1 wherein said photocathode is included in an end window of said phototube, and said conductors are incorporated into said end window.
Claim 7
Dependent Claim
19 words
An assembly according to claim 1 wherein said crystal means is constituted by a matrix of separate component crystals.
Claim 8
Dependent Claim
145 words
An assembly comprising: a. scintillator crystal means adapted to by excited by spatially distributed ratiation events to produce correspondingly distributed light events that provide photoelectrons; b. a phototube having a photocathode adapted to receive said photoelectrons; c. a plurality of electrically separate conductors arrayed in juxtaposition to said photocathode each of said conductors being associated with an elemental area of said photocathode so that the flow of current in a selected one of said conductors during the occurrence of a light event causes the resultant field to interfere with the flow of photoelectrons to the elemental area associated with said selected one of said conductors; d. said array of conductors forming a crossed grid and being interposed between said crystal means and said photocathode; and e. said photocathode being included in an end window of said phototube, and said grid being incorporated into said window.
Claim 9
Dependent Claim
145 words
An assembly comprising: a. scintillator crystal means adapted to by excited by spatially distributed ratiation events to produce correspondingly distributed light events that provide photoelectrons; b. a phototube having a photocathode adapted to receive said photoelectrons; c. a plurality of electrically separate conductors arrayed in juxtaposition to said photocathode each of said conductors being associated with an elemental area of said photocathode so that the flow of current in a selected one of said conductors during the occurrence of a light event causes the resultant field to interfere with the flow of photoelectrons to the elemental area associated with said selected one of said conductors; d. said array of conductors forming a crossed grid and being interposed between said crystal means and said photocathode; and e. said photocathode being included in an end window of said phototube, and said grid being incorporated into said window.
Claim 10
Dependent Claim
25 words
An assembly according to claim 5 wherein said end window furthermore incorporates a light piping arrangement capable of optically piping light through said end window.
Claim 11
Dependent Claim
16 words
An assembly according to claim 1 wherein said conductors are constituted of strips of metallic mesh.
Claim 12
Dependent Claim
34 words
An assembly according to claim 9, wherein each conductor is adapted to be connected to a source of voltage pulses and is associated with juxtaposed conductors adapted to be oppositely biased with respect thereto.
Claim 13
Dependent Claim
50 words
An assembly according to claim 1 including an array of conductive regions juxtaposed with respect to the photo cathode, each region being arranged for coupling to a pair of said conductors via unidirectional current flow devices so as to prevent current flow between said pair of conductors via the regions.
Claim 14
Dependent Claim
19 words
An assembly according to claim 11, wherein said array is incorporated in an end window of said photo tube.
Claim 15
Dependent Claim
25 words
An assembly according to claim 12 wherein said end window furthermore incorporates a light piping arrangement capable of optically piping light through said end window.
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |