Patent US4442360A successfully refreshed from Google Patents.
US4442360A
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Radiation detector
Assignee: Hitachi Healthcare Manufacturing Ltd
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Filing: 1981-04-24
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Granted: 1984-04-10
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Expires: 2001-04-24
Abstract
Abstract A radiation detector comprising a scintillator exhibiting luminescence by the action of radioactive rays and a light detector detecting light output of said scintillator, characterized in that said scintillator is a phosphor represented by the formula: (A1-x-yLnxCey)2O2S:X wherein A is at least one element selected from the group consisting of Y, La and Gd; Ln is at least one element selected from the group consisting of Pr, Tb and Eu; and X is at least one element selected from the group consisting of F, Cl and Br; and the values of x and y are 0.000003>/=x>/=0.2, and 0.000001>/=y>/=0.005, and the amount of X is 0 to 1000 ppm on weight basis, has a very short after glow time because of having Ce in the phosphor.
Inventors
- 👤 Atsushi Suzuki
- 👤 Hiromichi Yamada
- 👤 Yoko Uchida
- 👤 Hideki Kohno
- 👤 Fukino Tadashi
- 👤 Minoru Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:54
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/202; G01T1/2023; G01T1/2002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A radiation detector comprising a scintillator exhibiting luminescence by the action of radioactive rays and a light detector detecting light output of said scintillator, characterized in that said scintillator is a phosphor represented by the formula: (A.sub.1-x-y Ln.sub.x Ce.sub.y).sub.2 O.sub.2 S:X (I) wherein A is at least one element selected from the group consisting of Y, La and Gd; Ln is Pr; and X is at least one element selected from the group consisting of F, Cl and Br; and the values of x and y and the amount of X are as follows: 0.000003≦x≦0.2, 0.000001≦y≦0.005, and X=0 to 1000 ppm on weight basis.
Claim 2
Dependent Claim
104 words
A radiation detector comprising a scintillator exhibiting luminescence by the action of radioactive rays and a light detector detecting light output of said scintillator, characterized in that said scintillator is a phosphor represented by the formula: (A.sub.1-x-y Ln.sub.x Ce.sub.y).sub.2 O.sub.2 S:X (I) wherein A is at least one element selected from the group consisting of Y, La and Gd; Ln is Pr; and X is at least one element selected from the group consisting of F, Cl and Br; and the values of x and y and the amount of X are as follows: 0.000003≦x≦0.2, 0.000001≦y≦0.005, and X=0 to 1000 ppm on weight basis.
Claim 3
Dependent Claim
24 words
A radiation detector according to claim 1, wherein the amount of X in the formula (I) is 2 to 1,000 ppm on weight basis.
Claim 4
Dependent Claim
15 words
A radiation detector according to claim 2, wherein X in the general formula is F.
Claim 5
Dependent Claim
15 words
A radiation detector according to claim 2, wherein X in the formula (I) is Cl.
Claim 6
Dependent Claim
29 words
A radiation detector according to any one of claims 1, 2, 3 and 4, wherein the value of y in the formula (I) is in the following range: 0.000001≦y≦0.001.
Claim 7
Dependent Claim
50 words
A radiation detector according to any one of claims 1, 2, 3 and 4, wherein said scintillator is placed in a container having a light reflective inner wall and having, in one part of it, a light transmitting window for leading the luminescence from the scintillator to said light detector.
Claim 8
Dependent Claim
27 words
A radiation detector according to any one of claims 1, 2, 3 and 4, wherein said phosphor is constructed of one or more layers of phosphor particles.
Claim 9
Dependent Claim
20 words
A radiation detector according to claim 7, wherein said phosphor is particles having an average particle size of 1-200 μm.
Claim 10
Dependent Claim
48 words
A radiation detector according to claim 7, wherein said layer of phosphor particle is provided so as to form a plurality of layers and an optical guide is provided on at least one side of each layer for leading the luminescence from the layer to the light detector.
Claim 11
Dependent Claim
31 words
A radiation detector according to any one of claims 1, 2, 3 and 4, wherein said scintillator is constructed of a single crystal of the phosphor represented by the formula (I).
Claim 12
Dependent Claim
15 words
A radiation detector according to claim 2, wherein the amount of X is 5-250 ppm.
Claim 13
Dependent Claim
11 words
A radiation detector according to claim 1, wherein A is Gd.
Claim 14
Dependent Claim
11 words
A radiation detector according to claim 12, wherein X is F.
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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |