US4831263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position-sensitive radiation detector
Assignee: Hamamatsu Photonics KK
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Filing: 1988-03-16
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Granted: 1989-05-16
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Expires: 2008-03-16
Abstract
Abstract A position-sensitive radiation detector has a plate-like scintillator and a photomultiplier tube array that are connected each other. At least one of scintillator surfaces of a radiation incidence-side and a connection-side to the photomuliplier tube array is provided with plural grooves. This structure enables the detection of the depth of a scintillation point in the scintillator and the detection of the scintillation point in horizontal direction with high resolution.
Inventors
- 👤 Takaji Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2002; G01T1/161; G01T1/164; G01T1/1641; G01T1/1644; G01T1/202
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A position-sensitive radiation detector comprising: a scintillator having a horizontal extent and vertical extent and having a top surface and a bottom surface, said surfaces principally extending in one horizontal direction and defining therebetween said vertical extent of said scintillator; a plurality of reflection means having regular intervals in said one horizontal direction and extending from at least one of said top surface and said bottom surface of said scintillator, for reflecting light emitted from a scintillation point in said scintillator; position-sensitive photo-detecting means optically coupled to said scintillator and disposed along said bottom surface of said scintillator, for detecting light emanating from said bottom surface of said scintillator; and a scintillation position computer for determining, by calculation of the depth of a scintillation point in said scintillator, a scintillation position in said one horizontal direction and in a vertical direction.
Claim 2
Dependent Claim
141 words
A position-sensitive radiation detector comprising: a scintillator having a horizontal extent and vertical extent and having a top surface and a bottom surface, said surfaces principally extending in one horizontal direction and defining therebetween said vertical extent of said scintillator; a plurality of reflection means having regular intervals in said one horizontal direction and extending from at least one of said top surface and said bottom surface of said scintillator, for reflecting light emitted from a scintillation point in said scintillator; position-sensitive photo-detecting means optically coupled to said scintillator and disposed along said bottom surface of said scintillator, for detecting light emanating from said bottom surface of said scintillator; and a scintillation position computer for determining, by calculation of the depth of a scintillation point in said scintillator, a scintillation position in said one horizontal direction and in a vertical direction.
Claim 3
Dependent Claim
36 words
A position-sensitive radiation detector as claimed in claim 1, wherein said bottom surface s substantially flat and said plurality of reflection means are substantially planer grooves extending in a direction substantially perpendicular to said bottom surface.
Claim 4
Dependent Claim
18 words
A position-sensitive radiation detector as claimed in claim 2, wherein said grooves are filled with BaSO 4 .
Claim 5
Dependent Claim
52 words
A position-sensitive radiation detector as claimed claim 2, further including: upper grooves extending vertically from said top surface and lower groove extending vertically from said bottom surface, said upper grooves and said lower grooves being aligned opposite each other; and a light guide region between said upper grooves and said lower grooves.
Claim 6
Dependent Claim
43 words
A position-sensitive radiation detector as claimed in claim 2, further including upper grooves extending vertically from said top surface and lower grooves extending vertically from said bottom surface having equal pitches, said upper grooves and said lower grooves being aligned alternately each other.
Claim 7
Dependent Claim
141 words
A position-sensitive radiation detector, comprising: a scintillator having a horizontal extent and a vertical extent and having a top surface and a bottom surface, said surfaces extending in two horizontal dimensions and defining therebetween said vertical extent of said scintillator; lattice-shaped reflection means having regular intervals in two horizontal directions orthogonal each other and extending from at least one of said top surface and said bottom surface of said scintillator, for reflecting light emitted from a scintillation point in said scintillator; position-sensitive photo-detecting means optically coupled to said scintillator and disposed along said bottom surface of said scintillator, for detecting light emanating from said bottom surface of said scintillator; and a scintillation position computer for determining, by calculation of the depth of a scintillation point in said scintillator, a scintillation position in said two horizontal directions and in a vertical direction.
Claim 8
Dependent Claim
141 words
A position-sensitive radiation detector, comprising: a scintillator having a horizontal extent and a vertical extent and having a top surface and a bottom surface, said surfaces extending in two horizontal dimensions and defining therebetween said vertical extent of said scintillator; lattice-shaped reflection means having regular intervals in two horizontal directions orthogonal each other and extending from at least one of said top surface and said bottom surface of said scintillator, for reflecting light emitted from a scintillation point in said scintillator; position-sensitive photo-detecting means optically coupled to said scintillator and disposed along said bottom surface of said scintillator, for detecting light emanating from said bottom surface of said scintillator; and a scintillation position computer for determining, by calculation of the depth of a scintillation point in said scintillator, a scintillation position in said two horizontal directions and in a vertical direction.
Claim 9
Dependent Claim
37 words
A position-sensitive radiation detector as claimed in claim 6, wherein said bottom surface is substantially flat and said lattice-shaped reflection means is constituted by substantially planar grooves extending in a direction substantially perpendicular to said bottom surface.
Claim 10
Dependent Claim
18 words
A position-sensitive radiation detector as claimed in claim 7, wherein said grooves are filled with BaSO 4 .
Claim 11
Dependent Claim
55 words
A position-sensitive radiation detector as claimed in claim 7, further including: an upper lattice groove extending vertically from said top surface and a lower lattice groove extending vertically from said bottom surface, said lattice grooves being aligned opposite each other; and a light guide region between said upper lattice groove and said lower lattice groove.
Claim 12
Dependent Claim
51 words
A position-sensitive radiation detector as claimed in claim 7, further including an upper lattice groove extending vertically from said top surface and a lower lattice groove extending vertically from said bottom surface having equal lattice intervals in each of said two horizontal directions, said lattice grooves being aligned alternately each other.
References Cited (Backward Citations)
US4069421A
Cited
GB2005405A
Cited
GB2034148A
Cited
GB2072452A
Cited
WO1983003683A1
Cited
EP0112475A1
Cited
GB2167279A
Cited
WO1986003596A1
Cited
US4675526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |