EP0159726A2
Expired / Lapsed
EP
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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: 1985-04-26
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Granted: —
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Expires: 2005-04-26
Abstract
Abstract A divalent europium activated alkaline earth metal halide phosphor having the formula (I): in which M" is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cl, Br and I, and X ≠ X'; A is at least one oxide selected from the group consisting of Si0 2 and P 2 O 5 ; and a, b and x are numbers satisfying the conditions of 0.1 ≦ a ≦ 10.0,10 -4 ≦ b ≦ 2 x 10 -1 and 0 < x ≦ 0.2, respectively. A radiation image recording and reproducing method utilizing said phosphor and a radiation image storage panel employing said phosphor are also disclosed.
Inventors
- 👤 Kenji Takahashi
- 👤 Takashi Nakamura
- 👤 Yuichi Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:06
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/7739; C09K11/77342; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
108 words
A divalent europium activated alkaline earth metal halide phosphor having the formula (I): in which M II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cℓ, Br and I, and X ≠ X'; A is at least one oxide selected from the group consisting of SiO 2 and P 2 O 5 ; and a, b and x are numbers satisfying the conditions of 0.1 < a < 10.0, 10 -4 < b < 2x10 -1 and 0 < x < 0.2, respectively.
Claim 2
Dependent Claim
108 words
A divalent europium activated alkaline earth metal halide phosphor having the formula (I): in which M II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cℓ, Br and I, and X ≠ X'; A is at least one oxide selected from the group consisting of SiO 2 and P 2 O 5 ; and a, b and x are numbers satisfying the conditions of 0.1 < a < 10.0, 10 -4 < b < 2x10 -1 and 0 < x < 0.2, respectively.
Claim 3
Dependent Claim
34 words
The phosphor as claimed in claim 1, in which A in the formula (I) is SiO 2 and b is a number satisfying the condition of 6x10 -4 ≦ b < 10 -1 .
Claim 4
Dependent Claim
36 words
The phosphor as claimed in claim 1, in which A in the formula (I) is P 2 O 5 and b is a number satisfying the condition of 2x10 -3 ≦ b < 5x10 -2 .
Claim 5
Dependent Claim
26 words
The phosphor as claimed in claim 1, in which a in the formula (I) is a number satisfying the condition of 0.3 < a < 3.3.
Claim 6
Dependent Claim
17 words
The phosphor as claimed in claim 1, in which M II in the formula (I) is Ba.
Claim 7
Dependent Claim
22 words
The phosphor as claimed in claim 1, in which each of X and X' in the formula (I) is Cℓ or Br.
Claim 8
Dependent Claim
29 words
The phosphor as claimed in claim 1, in which x in the formula (I) is a number satisfying the condition of 10 -5 ≦ x < 10 -1 .
Claim 9
Dependent Claim
150 words
A radiation image recording and reproducing method comprising steps of: i) causing a divalent europium activated alkaline earth metal halide phosphor having the formula (II): in which M II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cℓ, Br and I, and X ≠ X'; and a, b and x are numbers satisfying the conditions of 0.1 < a < 10.0, 10 -4 < b < 2x10 -1 and 0 < x < 0.2, respectively, to absorb a radiation having passed through an object or having radiated from an object; ii) exposing said stimulable phosphor to an electromagnetic wave having a wavelength within the range of 450 - 1000 nm to release-the radiation energy stored therein as light emission; and iii) detecting the emitted light.
Claim 10
Dependent Claim
150 words
A radiation image recording and reproducing method comprising steps of: i) causing a divalent europium activated alkaline earth metal halide phosphor having the formula (II): in which M II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cℓ, Br and I, and X ≠ X'; and a, b and x are numbers satisfying the conditions of 0.1 < a < 10.0, 10 -4 < b < 2x10 -1 and 0 < x < 0.2, respectively, to absorb a radiation having passed through an object or having radiated from an object; ii) exposing said stimulable phosphor to an electromagnetic wave having a wavelength within the range of 450 - 1000 nm to release-the radiation energy stored therein as light emission; and iii) detecting the emitted light.
Claim 11
Dependent Claim
34 words
The radiation image recording and reproducing method as claimed in claim 8, in which b in the formula (II) is a number satisfying the condition of 6x10 -4 ≦ b < 10 -1 .
Claim 12
Dependent Claim
31 words
The radiation image recording and reproducing method as claimed in claim 8, in which a in the formula (II) is a number satisfying the condition of 0.3 < a < 3.3.
Claim 13
Dependent Claim
22 words
The radiation image recording and reproducing method as claimed in claim 8, in which M II in the formula (II) is Ba.
Claim 14
Dependent Claim
27 words
The radiation image recording and reproducing method as claimed in claim 8, in which each of X and X' in the formula (II) is Cℓ or Br.
Claim 15
Dependent Claim
34 words
The radiation image recording and reproducing method as claimed in claim 8, in which x in the formula (II) is a number satisfying the condition of 10 -5 ≦ x < 1 0-1 .
Claim 16
Dependent Claim
30 words
The radiation image recording and reproducing method as claimed in claim 8, in which said electromagnetic wave is one having a wavelength within the range of 500 - 850 nm.
Claim 17
Dependent Claim
21 words
The radiation image recording and reproducing method as claimed in claim 8, in which said electromagnetic wave is a laser beam.
Claim 18
Dependent Claim
109 words
A radiation image storage panel comprising a support and a stimulable phosphor layer provided thereon, in which said stimulable phosphor layer contains a divalent europium activated alkaline earth metal halide phosphor having the formula (II): in which M II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cℓ, Br and I, and X ≠ X'; and a, b and x are numbers satisfying the conditions of O.1 < a < 10.0, 10 < b < 2x10 -1 and 0 < x < 0.2, respectively.
Claim 19
Dependent Claim
109 words
A radiation image storage panel comprising a support and a stimulable phosphor layer provided thereon, in which said stimulable phosphor layer contains a divalent europium activated alkaline earth metal halide phosphor having the formula (II): in which M II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cℓ, Br and I, and X ≠ X'; and a, b and x are numbers satisfying the conditions of O.1 < a < 10.0, 10 < b < 2x10 -1 and 0 < x < 0.2, respectively.
Claim 20
Dependent Claim
30 words
The radiation image storage panel as claimed in claim 16, in which b in the formula (II) is a number satisfying the condition of 6x10 -4 < b < 10-1
Claim 21
Dependent Claim
29 words
The radiation image storage panel as claimed in claim 16, in which a in the formula (II) is a number satisfying the condition of 0.3 < a < 3.3.
Claim 22
Dependent Claim
20 words
The radiation image storage panel as claimed in claim 16, in which M II in the formula (II) is Ba.
Claim 23
Dependent Claim
25 words
The radiation image storage panel as claimed in claim 16, in which each of X and X' in the formula (II) is Cℓ or Br.
Claim 24
Dependent Claim
31 words
The radiation image storage panel as claimed in claim 16, in which x in the formula (II) is a number satisfying the condition of 10-5 < x < 10 -1 .
References Cited (Backward Citations)
No citation records indexed.
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