US4835398A
Expired / Lapsed
US
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Phosphor, Radiation image recording and reproducing method and radiation image storage panel
Assignee: Fujifilm Holdings Corp
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Filing: 1987-11-04
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Granted: 1989-05-30
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Expires: 2007-11-04
Abstract
Abstract A cerium activated rare earth halide phosphor having the formula (I): LnX.sub.3 ·aM.sup.I X':xCe.sup.3+ (I) in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu; M I is at least one alkali metal selected from the group consisting of Li, Na, K, Cs and Rb; each of X and X' is at least one halogen selected from the group consisting of Cl, Br and I; and a and x are numbers satisfying the conditions of O<a≦10.0 and O<x≦0.2, respectively. A process for the preparation of said phosphor, a radiation image recording and reproducing method utilizing said phosphor, and a radiation image storage panel employing said phosphor are also disclosed.
Inventors
- 👤 Takashi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:58
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7772; C09K11/7773
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
154 words
A radiation image recording and reproducing method comprising steps of: (i) causing a cerium activated rare earth halide phosphor having the formula (I): LnX 3 ·aM I X':Ce 3+ (I) in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu; M I is at least one alkali metal selected from the group consisting of Li, Na, K, Cs and Rb; each of X and X; is at least one halogen selected from the group consisting of Cl, Br and I; and a and x are numbers satisfying the conditions of 0<a≦10.0 and 0<×0.2, respectively. to absorb a radiation having passed through an object or having radiated from an object; (ii) exciting said stimulable phosphor with an electromagnetic wave having a wavelength within the range of 500-850 nm to release the radiation energy stored therein as light emission; and (iii) detecting the emitted light.
Claim 2
Dependent Claim
154 words
A radiation image recording and reproducing method comprising steps of: (i) causing a cerium activated rare earth halide phosphor having the formula (I): LnX 3 ·aM I X':Ce 3+ (I) in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu; M I is at least one alkali metal selected from the group consisting of Li, Na, K, Cs and Rb; each of X and X; is at least one halogen selected from the group consisting of Cl, Br and I; and a and x are numbers satisfying the conditions of 0<a≦10.0 and 0<×0.2, respectively. to absorb a radiation having passed through an object or having radiated from an object; (ii) exciting said stimulable phosphor with an electromagnetic wave having a wavelength within the range of 500-850 nm to release the radiation energy stored therein as light emission; and (iii) detecting the emitted light.
Claim 3
Dependent Claim
27 words
The radiation image recording and reproducing method as claimed in claim 1, in which a in the formula (I) is a number satisfying the condition of 0.1≦a≦2.0.
Claim 4
Dependent Claim
27 words
The radiation image recording and reproducing method as claimed in claim 2, in which a in the formula (I) is a number satisfying the condition of 0.2≦a≦1.0.
Claim 5
Dependent Claim
35 words
The radiation image recording and reproducing method as claimed in claim 1, in which Ln in the formula (I) is at least one rare earth element selected from the group consisting of Y and La.
Claim 6
Dependent Claim
35 words
The radiation image recording and reproducing method as claimed in claim 1, in which M I in the formula (I) is at least one alkali metal selected from the group consisting of Cs and Rb.
Claim 7
Dependent Claim
29 words
The radiation image recording and reproducing method as claimed in claim 1, in which each of X and X' in the formula (I) is Cl or Br, and X≠X".
Claim 8
Dependent Claim
31 words
The radiation image recording and reproducing method as claimed in claim 1, in which x in the formula (I) is a number satisfying the condition of 10 -5 ≦x≦10 -2 .
Claim 9
Dependent Claim
29 words
The radiation image recording and reproducing method as claimed in claim 1, in which the said electromagnetic wave is one having a wavelength within the range of 500-700 nm.
Claim 10
Dependent Claim
21 words
The radiation image recording and reproducing method as claimed in claim 1, in which said electromagnetic wave is a laser beam.
Claim 11
Dependent Claim
120 words
A radiation image storage panel comprising a support and a phosphor layer provided thereon which comprises a binder and a stimulable phosphor dispersed therein, in which said phosphor layer contains a cerium activated rare earth halide phosphor having the formula (I): LnX.sub.3 ·aM.sup.I X':xCe.sup.3+ (I) in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu; M I is at least one alkali metal selected from the group consisting of Li, Na, K, Cs and Rb; each of X and X' is at least one halogen selected from the group consisting of Cl, Br and I; and a and x are numbers satisfying the conditions of 0≦a≦10.0 and 0<x≦0.2, respectively.
Claim 12
Dependent Claim
120 words
A radiation image storage panel comprising a support and a phosphor layer provided thereon which comprises a binder and a stimulable phosphor dispersed therein, in which said phosphor layer contains a cerium activated rare earth halide phosphor having the formula (I): LnX.sub.3 ·aM.sup.I X':xCe.sup.3+ (I) in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu; M I is at least one alkali metal selected from the group consisting of Li, Na, K, Cs and Rb; each of X and X' is at least one halogen selected from the group consisting of Cl, Br and I; and a and x are numbers satisfying the conditions of 0≦a≦10.0 and 0<x≦0.2, respectively.
Claim 13
Dependent Claim
25 words
The radiation image storage panel as claimed in claim 10, in which a in the formula (I) is a number satisfying the condition of 0.1≦a≦2.0.
Claim 14
Dependent Claim
25 words
The radiation image storage panel as claimed in claim 11, in which a in the formula (I) is a number satisfying the condition of 0.2≦a≦1.0.
Claim 15
Dependent Claim
33 words
The radiation image storage panel as claimed in claim 10, in which Ln in the formula (I) is at least one rare earth element selected from the group consisting of Y and La.
Claim 16
Dependent Claim
33 words
The radiation image storage panel as claimed in claim 10, in which M I in the formula (I) is at least one alkali metal selected from the group consisting of Cs and Rb.
Claim 17
Dependent Claim
27 words
The radiation image storage panel as claimed in claim 10, in which each of X and X' in the formula (I) is Cl or Br, and X≠X'.
Claim 18
Dependent Claim
29 words
The radiation image storage panel as claimed in claim 10, in which x in the formula (I) is a number satisfying the condition of 10 -5 ≦x≦10 -2 .
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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |