JPH0554639B2 - - Google Patents
Info
- Publication number
- JPH0554639B2 JPH0554639B2 JP7048585A JP7048585A JPH0554639B2 JP H0554639 B2 JPH0554639 B2 JP H0554639B2 JP 7048585 A JP7048585 A JP 7048585A JP 7048585 A JP7048585 A JP 7048585A JP H0554639 B2 JPH0554639 B2 JP H0554639B2
- Authority
- JP
- Japan
- Prior art keywords
- phosphor
- radiation image
- image conversion
- radiation
- bismuth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 154
- 230000005855 radiation Effects 0.000 claims description 119
- 238000006243 chemical reaction Methods 0.000 claims description 81
- 238000000034 method Methods 0.000 claims description 45
- 229910052797 bismuth Inorganic materials 0.000 claims description 25
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 19
- 150000004820 halides Chemical class 0.000 claims description 19
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical class [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 15
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- 229910052794 bromium Inorganic materials 0.000 claims description 9
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 44
- 239000011248 coating agent Substances 0.000 description 19
- 238000000576 coating method Methods 0.000 description 19
- 230000005284 excitation Effects 0.000 description 19
- 238000004020 luminiscence type Methods 0.000 description 18
- 239000000203 mixture Substances 0.000 description 17
- 239000010408 film Substances 0.000 description 15
- AIYUHDOJVYHVIT-UHFFFAOYSA-M caesium chloride Chemical compound [Cl-].[Cs+] AIYUHDOJVYHVIT-UHFFFAOYSA-M 0.000 description 12
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 12
- 238000000695 excitation spectrum Methods 0.000 description 12
- -1 oxides Chemical class 0.000 description 12
- LYQFWZFBNBDLEO-UHFFFAOYSA-M caesium bromide Chemical compound [Br-].[Cs+] LYQFWZFBNBDLEO-UHFFFAOYSA-M 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 10
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- 239000000460 chlorine Substances 0.000 description 8
- 238000000295 emission spectrum Methods 0.000 description 8
- 229920000728 polyester Polymers 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 7
- 239000000020 Nitrocellulose Substances 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 229920001220 nitrocellulos Polymers 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910052771 Terbium Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical group 0.000 description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 3
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 238000002601 radiography Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 229910052712 strontium Inorganic materials 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052693 Europium Inorganic materials 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 2
- 229910052775 Thulium Inorganic materials 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 229910001508 alkali metal halide Inorganic materials 0.000 description 2
- 150000008045 alkali metal halides Chemical class 0.000 description 2
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001622 bismuth compounds Chemical class 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- PZBLUWVMZMXIKZ-UHFFFAOYSA-N 2-o-(2-ethoxy-2-oxoethyl) 1-o-ethyl benzene-1,2-dicarboxylate Chemical compound CCOC(=O)COC(=O)C1=CC=CC=C1C(=O)OCC PZBLUWVMZMXIKZ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229920002307 Dextran Polymers 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- AEMRFAOFKBGASW-UHFFFAOYSA-M Glycolate Chemical compound OCC([O-])=O AEMRFAOFKBGASW-UHFFFAOYSA-M 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
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- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 241000978776 Senegalia senegal Species 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
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- 239000000205 acacia gum Substances 0.000 description 1
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- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 239000001361 adipic acid Substances 0.000 description 1
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- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910001618 alkaline earth metal fluoride Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 229910001864 baryta Inorganic materials 0.000 description 1
- HSUIVCLOAAJSRE-UHFFFAOYSA-N bis(2-methoxyethyl) benzene-1,2-dicarboxylate Chemical compound COCCOC(=O)C1=CC=CC=C1C(=O)OCCOC HSUIVCLOAAJSRE-UHFFFAOYSA-N 0.000 description 1
- 150000001621 bismuth Chemical class 0.000 description 1
- BRCWHGIUHLWZBK-UHFFFAOYSA-K bismuth;trifluoride Chemical compound F[Bi](F)F BRCWHGIUHLWZBK-UHFFFAOYSA-K 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
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- ASMQGLCHMVWBQR-UHFFFAOYSA-M diphenyl phosphate Chemical compound C=1C=CC=CC=1OP(=O)([O-])OC1=CC=CC=C1 ASMQGLCHMVWBQR-UHFFFAOYSA-M 0.000 description 1
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- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 239000011261 inert gas Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000001748 luminescence spectrum Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
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- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
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- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
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- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
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- 229910052727 yttrium Inorganic materials 0.000 description 1
Description
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ãæŸå°ç·åå€æããã«ã«é¢ãããã®ã§ãããDETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a radiation image conversion method and a radiation image conversion panel used in the method. More specifically, the present invention relates to a radiation image conversion method using a photostimulable bismuth-activated alkali metal halide phosphor, and a radiation image conversion panel used in the method.
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ç»ååãããã®ã§ããã[Technical Background of the Invention and Prior Art] Conventionally, as a method of obtaining a radiation image as an image,
A so-called radiographic method is used which uses a combination of a radiographic film having an emulsion layer made of a silver salt photosensitive material and an intensifying screen. As an alternative to the conventional radiographic method, a radiation image conversion method using a stimulable phosphor is known, for example, as described in Japanese Patent Application Laid-Open No. 12145/1983. This method involves absorbing radiation transmitted through the subject or radiation emitted from the subject into a stimulable phosphor.
Then, by exciting this phosphor in a time-series manner with electromagnetic waves (excitation light) such as visible light and infrared rays, the radiation energy accumulated in the phosphor is released as fluorescence (stimulated luminescence). Fluorescence is read photoelectrically to obtain an electrical signal, and this electrical signal is converted into an image.
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ãéåžžã«é«ããã®ã§ããã The radiation image conversion method has the advantage that it is possible to obtain an X-ray image with a rich amount of information with a much lower exposure dose than when conventional radiography is used. Therefore, this radiation image conversion method has a very high utility value especially in direct medical radiography such as X-ray photography for the purpose of medical diagnosis.
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ãããŠããã As a stimulable phosphor used in the above radiation image conversion method, JP-A-55-12145 discloses a rare earth element-activated alkaline earth metal fluoride halide phosphor represented by the following composition formula. .
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at least one of the following, X is Cl, Br, and at least one of the following, A is Eu, Tb, Ce,
at least one of Tm, Dy, Pr, Ho, Nd, Yb, and Er, and x is 0âŠxâŠ0.6,
(y is 0âŠyâŠ0.2) After absorbing radiation such as X-rays, this phosphor emits light in the near-ultraviolet region (stimulated luminescence) when irradiated with electromagnetic waves in the visible light to infrared region. It is something.
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äœä»¥å€ã¯ããŸãç¥ãããŠããªãã As mentioned above, the above rare earth element-activated alkaline earth metal halide phosphors have been known as phosphors used in radiation image conversion methods that utilize stimulable phosphors, but they exhibit photostimulability. Not much is known about the phosphor itself other than this rare earth element-activated alkaline earth metal halide phosphor.
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ã®ã§ããã[Summary of the Invention] The present invention is based on the invention of a novel stimulable phosphor, and provides a radiation image conversion method and a radiation image conversion panel using the stimulable phosphor.
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ç®çãšãããã®ã§ããã That is, an object of the present invention is to provide a radiation image conversion method using a novel stimulable phosphor, and a radiation image conversion panel used in the method.
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ãã«è³ã€ãã®ã§ããã The present inventors have conducted various studies with the aim of searching for stimulable phosphors. As a result, the new bismuth-activated cesium halide phosphor represented by the following compositional formula () exhibits stimulated luminescence.
After irradiation with radiation such as rays and beta rays, 450 ~
They discovered that when excited with electromagnetic waves of 900 nm in the visible to infrared region, they exhibit stimulated luminescence in the near-ultraviolet to blue region, and based on this knowledge, they completed the present invention.
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ãæ€åºããããšãç¹åŸŽãšããã Composition formula (): CsX:xBi () (However, X is either Cl or Br; and x is a numerical value in the range of 0<xâŠ0.2) That is, the radiation image conversion method of the present invention After the radiation transmitted through the subject or emitted from the subject is absorbed by the bismuth-activated cesium halide phosphor represented by the above compositional formula (),
The method is characterized in that by irradiating this phosphor with electromagnetic waves in the wavelength range of 450 to 900 nm, the radiation energy stored in the phosphor is emitted as fluorescence, and this fluorescence is detected.
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äœãå«æããããšãç¹åŸŽãšããã Further, the radiation image storage panel of the present invention substantially comprises a support and at least one phosphor layer formed on the support and comprising a binder containing and supporting the stimulable phosphor in a dispersed state. It is configured,
At least one of the phosphor layers is characterized in that it contains a bismuth-activated cesium halide phosphor represented by the above compositional formula ().
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èŒå°œå±èµ·ã¹ãã¯ãã«ã§ããã[Structure of the Invention] FIG. 1 illustrates the stimulated excitation spectrum of the bismuth-activated cesium halide phosphor used in the radiation image conversion method of the present invention. CsCl:Bi
These are photostimulation excitation spectra of phosphor, CsBr:Bi phosphor and CsI:Bi phosphor.
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ããŠã§ããã From FIG. 1, it can be seen that the phosphor used in the present invention exhibits stimulated luminescence when excited with electromagnetic waves in the wavelength range of 450 to 900 nm after irradiation with radiation. Furthermore, from FIG. 1, the positions of the maximum peaks of the photostimulation excitation spectrum of the phosphor used in the present invention are as follows: It can be seen that in the order of 3), the latter has a longer wavelength, and in particular, a phosphor in which X is I is efficiently excited by infrared rays such as semiconductor laser light. In the radiation image conversion method of the present invention, the electromagnetic wave wavelength used as excitation light is 450
It is based on this fact that it is specified as ~900 nm.
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äœã®èŒå°œå±èµ·ã¹ãã¯ãã«ã§ããã Figure 2 illustrates the stimulated emission spectrum of the bismuth-activated cesium halide phosphor used in the radiation image conversion method of the present invention.
CsCl: Bi phosphor, CsBr; Bi phosphor and CsI:
This is the photostimulation excitation spectrum of Bi phosphor.
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ã®ãã®ã»ã©é·æ³¢é·åŽã«ããããšããããã As is clear from FIG. 2, the phosphor used in the present invention exhibits stimulated luminescence in the near ultraviolet to blue region, and the peak of its stimulated luminescence spectrum is approximately 350 to
It is in the wavelength range of 450nm. Therefore, in the radiation image conversion method of the present invention, after radiation irradiation, the phosphor is
When exciting with electromagnetic waves in the wavelength range of 500 to 850 nm, it is easy to separate stimulated luminescence and excitation light.
In addition, the stimulated luminescence of the phosphor has high brightness. Also the second
From the figure, the position of the maximum peak of the stimulated emission spectrum of the phosphor used in the present invention is similar to the maximum peak position of the stimulated excitation spectrum described above. Curve 1),
It can be seen that in the order of Br (curve 2) and (curve 3), the latter is on the longer wavelength side.
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ããããšã確èªãããŠããã The stimulated luminescence properties of the bismuth-activated cesium halide phosphor used in the present invention have been explained above using a specific phosphor as an example. However, the stimulated luminescence properties of other phosphors used in the present invention are also as described above. The stimulated luminescence properties are almost the same as those of phosphors, and when excited with electromagnetic waves in the wavelength range of 450 to 900 nm after irradiation with radiation, it exhibits stimulated luminescence in the near-ultraviolet to blue region, and its emission peak is around 350 to 450 nm. It has been confirmed that there is.
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Because of this, it is possible to use a compact semiconductor laser (having an emission wavelength in the infrared region) as an excitation light source, which is small and has a low driving power. It becomes possible to downsize. Particularly when using a phosphor whose matrix is halogen, efficient excitation can be achieved by using a semiconductor laser as the excitation light source. In addition, in terms of the brightness of stimulated luminescence and the wavelength separation from the emitted light, the excitation light in the radiation image conversion method of the present invention is
Preferably, the electromagnetic wave is in the wavelength range of 850 nm.
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åãç»ååããããšãå¯èœãšãªãã In the radiation image conversion method of the present invention using a stimulable phosphor represented by the composition formula () in the form of a radiation image conversion panel, the radiation transmitted through the subject or emitted from the subject is It is proportionally absorbed by the phosphor layer of the radiation image conversion panel, and a radiation image of the subject or subject is formed on the radiation image conversion panel as an image of accumulated radiation energy. This accumulated image can be emitted as stimulated luminescence (fluorescence) by exciting it with electromagnetic waves (excitation light) in the wavelength range of 450 to 900 nm, and this stimulated luminescence can be read photoelectrically and converted into an electrical signal. By doing so, it becomes possible to image the accumulated radiation energy.
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ã«å€ããããšãã§ããã Note that FIG. 3 shows an example of obtaining a radiographic image of a subject, but if the subject 12 itself emits radiation (herein referred to as the subject), the above method may be used. It is not necessary to particularly install the radiation generating device 11. Further, the photoelectric conversion device 15 to the image display device 17 can be replaced with other suitable devices that can reproduce information emitted as fluorescence from the radiation image conversion panel 13 as an image in some form.
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圢æãããã As shown in FIG. 3, when the subject 12 is irradiated with radiation such as X-rays from the radiation generating device 11, the radiation passes through the subject 12 in proportion to the radiation transmittance of each part of the subject 12. The radiation that has passed through the subject 12 then enters the radiation image conversion panel 13 and is absorbed by the phosphor layer of the radiation image conversion panel 13 in proportion to the intensity of the radiation. That is, a radiation energy accumulation image (a kind of latent image) corresponding to a radiation transmission image is formed on the radiation image conversion panel 13.
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ãã€ãŠãã®ç»åã衚瀺ããã Next, when the radiation image conversion panel 13 is irradiated with electromagnetic waves in the wavelength range of 450 to 900 nm using the light source 14, the accumulated radiation energy image formed on the radiation image conversion panel 13 is emitted as fluorescence.
This emitted fluorescence is transmitted to the radiation image conversion panel 13
It is proportional to the strength of the radiation energy absorbed by the phosphor layer. This optical signal composed of the intensity of fluorescence is converted into an electrical signal by a photoelectric conversion device 15 such as a photomultiplier tube, and an image reproduction device 16 converts the optical signal into an electrical signal.
The image is reproduced as an image by the image display device 17, and this image is displayed by the image display device 17.
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ãšãã§ãããšã®å©ç¹ãããã The operation of reading out the image information accumulated in a radiation image conversion panel as fluorescence is generally performed by scanning the panel in time series with a laser beam, and then transmitting the fluorescence emitted from the panel by this scanning through a suitable light condenser. This is done by detecting with a photodetector such as a photomultiplier tube and obtaining a time-series electrical signal. In order to obtain an image with better observation and interpretation performance, this readout may consist of a pre-reading operation by irradiating low-energy excitation light and a main-reading operation by irradiating high-energy excitation light (Japanese Patent Laid-Open No. 58 -Refer to Publication No. 67240). By performing this pre-read operation, there is an advantage that the read conditions for the main read operation can be suitably set.
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åããæ§æãããŠããŠãããã Furthermore, for example, solid-state photoelectric conversion elements such as photoconductors and photodiodes can be used as photoelectric conversion devices (Japanese Patent Application No. 58-86226, Japanese Patent Application No. 58-86227, Japanese Patent Application No. 58-219313, and Specifications of Application No. 58-219314 and JP-A-58-
(See Publication No. 121874). In this case, a large number of solid-state photoelectric conversion elements may be configured to cover the entire surface of the panel, and may be integrated with the panel, or may be arranged in close proximity to the panel. Further, the photoelectric conversion device may be a line sensor in which a plurality of photoelectric conversion elements are connected in a line,
Alternatively, it may be composed of one solid-state photoelectric conversion element corresponding to one pixel.
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ãå¯èœã§ããã In addition to a point light source such as a laser, the light source in the above case may be a line light source such as an array of light emitting diodes (LEDs), semiconductor lasers, etc. arranged in a row. By performing readout using such a device, it is possible to prevent loss of fluorescence emitted from the panel, and at the same time, increase the solid angle of light reception and increase the S/N ratio. Furthermore, since the obtained electrical signals are converted into time series not by time series irradiation of excitation light but by electrical processing of the photodetector, it is possible to increase the readout speed. .
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§ïŒã The radiation image conversion panel from which the image information has been read is irradiated with light in the wavelength range of the excitation light of the phosphor, or by heating to erase the remaining radiation energy. It is possible and preferable to do so (Japanese Patent Laid-Open No. 1983
-11392 and Japanese Unexamined Patent Publication No. 12599/1983).
By performing this erasing operation, it is possible to prevent noise from occurring due to afterimages when the panel is used next time. Furthermore, by performing the erasing operation twice, once after reading and immediately before the next use, it is possible to prevent noise from occurring due to natural radioactivity and perform erasing more efficiently (Japanese Patent Laid-Open Publication No.
57-116300).
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ãã§ããã In the radiation image conversion method of the present invention, the radiation used to obtain a radiation transmission image of the subject is:
Any radiation may be used as long as it can exhibit stimulated luminescence when the phosphor is further excited by the electromagnetic waves after being irradiated with this radiation,
For example, commonly known radiation such as X-rays, electron beams, and ultraviolet rays can be used. Furthermore, when obtaining a radiation image of the subject, the radiation directly emitted from the subject may be any radiation that is similarly absorbed by the phosphor and serves as an energy source for stimulated luminescence. Examples include radiation such as gamma rays, alpha rays, and beta rays.
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ãŠå¥œãŸããã In addition to light sources that emit light with a band spectrum distribution in the wavelength range of 450 to 900 nm, light sources for electromagnetic waves that excite the phosphor that has absorbed radiation from the subject or the subject as described above include:
Light sources such as lasers such as Ar ion lasers, He-Ne lasers, ruby lasers, semiconductor lasers, glass lasers, YAG lasers, Kr ion lasers, dye lasers, and light emitting diodes can be used. Among these, laser light is preferable as the excitation light source used in the present invention because it can irradiate the radiation image conversion panel with a laser beam having a high energy density per unit area. Among them, He--Ne laser is preferred from the viewpoint of stability and output. In addition, semiconductor lasers are small, require low driving power,
It is preferable as an excitation light source because direct modulation is possible and the laser output can be easily stabilized.
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奜ãŸããã As mentioned above, a semiconductor laser is particularly preferable as a light source for excitation of a phosphor whose parent substance is halogen, since efficient excitation is possible.
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æŸå°ç·åå€æããã«ã«ã€ããŠèª¬æããã Next, a radiation image conversion panel used in the radiation image conversion method of the present invention will be explained.
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ãæ§æãããã As described above, this radiation image conversion panel includes a support substantially including a support and a bismuth-activated alkali metal halide phosphor provided on the support in a dispersed state represented by the above compositional formula (). and at least one phosphor layer made of a binder.
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ãšãã§ããã The radiation image conversion panel having the above configuration can be manufactured, for example, by the method described below.
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é ããããšãã§ããã This bismuth-activated cesium halide phosphor is
For example, it can be manufactured by the manufacturing method described below.
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ãããã First, prepare at least one compound selected from the group consisting of (1) CsCl, CsBr, or CsI, and (2) bismuth compounds such as halides, oxides, nitrates, and sulfates as a phosphor raw material. do. In some cases, ammonium halide (NH 4 X'; where X' is Cl, Br or I) may also be used as a flux.
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äœåæã®æ··åç©ã調補ããã When manufacturing a phosphor, the above (1) cesium halide and (2) bismuth compound are used to form a stoichiometric composition formula (): CsX:xBi () (where X is Cl or Br). and x is a numerical value in the range of 0<xâŠ0.2) by weighing and mixing to obtain a relative ratio corresponding to 0<xâŠ0.2 to prepare a mixture of phosphor raw materials.
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âŠïœâŠ10-2ã®ç¯å²ã«ããã®ã奜ãŸããã In the method for manufacturing the phosphor used in the present invention,
Mainly from the viewpoint of stimulated luminescence brightness, the x value representing the activation amount of bismuth in the composition formula () is 5 Ã 10 -4
Preferably, the range is âŠxâŠ10 -2 .
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ã«ãã€ãŠè¡ãªã€ãŠãããã The phosphor raw material mixture may be prepared by (i) simply mixing the phosphor raw materials in (1) and (2) above, or (ii) by mixing the phosphor raw materials in (1) and (2) above. After mixing the phosphor raw materials in a solution state, this solution is heated (preferably
This may be carried out by drying at a temperature of 50 to 200° C. under reduced pressure, vacuum drying, spray drying, etc., and then mixing the phosphor raw materials.
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ãã In both methods (i) and (ii) above, common mixers such as various mixers, V-type blenders, ball mills, and rod mills are used for mixing.
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ããã Next, the phosphor raw material mixture obtained as described above is filled into a heat-resistant container such as a quartz boat, an alumina crucible, or a quartz crucible, and fired in an electric furnace. The firing temperature is suitably in the range of 500 to 1000°C, preferably in the range of 600 to 800°C. Although the firing time varies depending on the filling amount of the phosphor raw material mixture and the firing temperature, 0.5 to 6 hours is generally appropriate. The firing atmosphere includes a weakly reducing atmosphere such as a nitrogen gas atmosphere containing a small amount of hydrogen gas or a carbon dioxide atmosphere containing carbon monoxide; an inert gas atmosphere such as nitrogen gas or argon gas; and air. Utilizes the acidic atmosphere of
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æäœãè¡ãªã€ãŠãããã By the above baking, the powdered phosphor of the present invention is obtained. Note that the obtained powdered phosphor may be further subjected to various general operations in the production of phosphors, such as washing, drying, and sieving, as necessary.
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ïŒã¡ã¿ïŒã¢ã¯ãªã¬ãŒããšã®æ··åç©ã§ããã Examples of binders for the phosphor layer formed by dispersing the bismuth-activated cesium halide phosphor include proteins such as gelatin, polysaccharides such as dextran, or natural materials such as gum arabic. Polymeric substances; polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethylcellulose, vinylidene chloride/vinyl chloride copolymer, polyalkyl (meth)acrylate, vinyl chloride/vinyl acetate copolymer, polyurethane, cellulose acetate butyrate, polyvinyl alcohol, wire Examples include binders typified by synthetic polymeric substances such as polyester. Particularly preferred among such binders are nitrocellulose, linear polyesters, polyalkyl (meth)acrylates, mixtures of nitrocellulose and linear polyesters, and mixtures of nitrocellulose and polyalkyl (meth)acrylates. It is.
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æ¯æäœäžã«åœ¢æããããšãã§ããã The phosphor layer can be formed on the support, for example, by the following method.
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ããã First, a particulate stimulable phosphor and a binder are added to a suitable solvent and thoroughly mixed to prepare a coating solution in which the stimulable phosphor is uniformly dispersed in the binder solution.
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ããã®æ··åç©ãæããããšãã§ããã Examples of solvents for preparing coating solutions include lower alcohols such as methanol, ethanol, n-propanol, and n-butanol; chlorine-containing hydrocarbons such as methylene chloride and ethylene chloride; and ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. ; esters of lower fatty acids and lower alcohols such as methyl acetate, ethyl acetate, and butyl acetate; ethers such as dioxane, ethylene glycol monoethyl ether, and ethylene glycol monomethyl ether; and mixtures thereof.
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ïŒïŒ40ïŒééæ¯ïŒã®ç¯å²ããéžã¶ã®ã奜ãŸããã The mixing ratio of the binder and the stimulable phosphor in the coating solution varies depending on the characteristics of the intended radiation image conversion panel, the type of phosphor, etc., but in general, the mixing ratio of the binder and the stimulable phosphor is , 1:1 to 1:100 (weight ratio), and particularly preferably 1:8 to 1:40 (weight ratio).
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ãã«ãªã©ãæããããšãã§ããã The coating liquid also contains a dispersant to improve the dispersibility of the phosphor in the coating liquid, and a dispersant to improve the bonding force between the binder and the phosphor in the phosphor layer after formation. Various additives such as plasticizers may be mixed. Examples of dispersants used for such purposes include phthalic acid, stearic acid, caproic acid, lipophilic surfactants, and the like. Examples of plasticity include phosphate esters such as triphenyl phosphate, tricresyl phosphate, and diphenyl phosphate; phthalate esters such as diethyl phthalate and dimethoxyethyl phthalate; and glycols such as ethyl phthalyl ethyl glycolate and butyl phthalyl glycolate. Acid esters; and polyesters of polyethylene glycol and aliphatic dibasic salts, such as polyesters of triethylene glycol and adipic acid and polyesters of diethylene glycol and succinic acid.
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ãŒãªã©ãçšããããšã«ããè¡ãªãããšãã§ããã The coating solution containing the phosphor and binder prepared as described above is then uniformly applied to the surface of the support to form a coating film of the coating solution.
This coating operation can be carried out using conventional coating means such as a doctor blade, roll coater, knife coater, etc.
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ãã§ããã The support may be arbitrarily selected from various materials used as supports for intensifying screens (or intensifying screens) in conventional radiography or materials known as supports for radiation image conversion panels. I can do it. Examples of such materials include films of plastic materials such as cellulose acetate, polyester, polyethylene terephthalate, polyamide, polyimide, triacetate, polycarbonate, metal sheets such as aluminum foil, aluminum alloy foil, ordinary paper,
Examples include baryta paper, resin-coated paper, pigment paper containing pigments such as titanium dioxide, and paper sized with polyvinyl alcohol.
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å€æããã«ã«é©ããæ¯æäœã§ããã However, in consideration of the characteristics and handling of the radiation image storage panel as an information recording material, a particularly preferred material for the support in the present invention is plastic film. This plastic film may be kneaded with a light-absorbing substance such as carbon black, or may be kneaded with a light-reflecting substance such as titanium dioxide. The former is a support suitable for a high sharpness type radiation image conversion panel, and the latter is a support suitable for a high sensitivity type radiation image conversion panel.
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éãªã©ã«å¿ããŠä»»æã«éžæããããšãã§ããã In known radiation image conversion panels, a phosphor layer is provided in order to strengthen the bond between the support and the phosphor layer, or to improve the sensitivity or image quality (sharpness, granularity) of the radiation image conversion panel. A polymeric substance such as gelatin is coated on the surface of the side support to form an adhesion-imparting layer, or a light-reflecting layer made of a reflective material such as titanium dioxide, or a light-absorbing layer made of a light-absorbing material such as carbon black. It is known to provide a layer or the like. The support used in the present invention can also be provided with these various layers, and their configurations can be arbitrarily selected depending on the purpose, use, etc. of the desired radiation image storage panel.
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ã圢æãããŠããŠãããã Furthermore, as described in Japanese Unexamined Patent Publication No. 58-200200 by the present applicant, in order to improve the sharpness of the obtained image, the surface of the support on the phosphor layer side (the phosphor layer of the support) Adhesive layer on the side surface,
When a light reflecting layer or a light absorbing layer is provided, minute irregularities may be formed on the surface (meaning the surface thereof).
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ã¯50ä¹è³500ÎŒmãšããã®ã奜ãŸããã After forming the coating film on the support as described above, the coating film is dried to complete the formation of the stimulable phosphor layer on the support. The thickness of the phosphor layer varies depending on the characteristics of the intended radiation image conversion panel, the type of phosphor, the mixing ratio of the binder and the phosphor, etc.
Usually it is 20 ÎŒm to 1 mm. However, the thickness of this layer is preferably 50 to 500 ÎŒm.
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ãããã Furthermore, the stimulable phosphor layer does not necessarily need to be formed by directly applying a coating solution onto the support as described above, but can be formed by separately applying it onto a sheet such as a glass plate, metal plate, or plastic sheet. After forming a phosphor layer by applying a liquid and drying it,
The support and the phosphor layer may be bonded together by pressing this onto the support or using an adhesive.
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äœã䜵çšããããšãã§ããã Although only one stimulable phosphor layer may be used, two or more layers may be stacked. When layered, at least one of the layers should contain a bismuth-activated cesium halide phosphor having the composition formula (), and multiple layers should be layered so that the luminous efficiency against radiation increases in sequence toward the surface of the panel. It is also possible to have a structure in which phosphor layers are stacked. In both cases of single layer and multilayer, a known stimulable phosphor can be used in combination with the above phosphor.
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ãªã©ãæããããšãã§ããã Examples of such known stimulable phosphors include:
In addition to the above-mentioned phosphors, ZnS:Cu, Pb, BaO and
xAl 2 O 3 :Eu (however, 0.8âŠxâŠ10), and
MãOã»xSiO 2 :A (However, Mã is Mg, Ca, Sr,
Zn, Cd, or Ba, and A is Ce, Tb, Eu,
Tm, Pb, Tl, Bi, or Mn, and x is 0.5
âŠxâŠ2.5), (Ba 1-xy , Mg x , Ca y ) FX: aEu 2+ (However, X
is at least one of Cl and Br,
x and y are 0<x+yâŠ0.6 and xyâ 0, and a is 10 -6 âŠaâŠ5Ã10 -2 ), and as described in Japanese Patent Application Laid-Open No. 12144-1983.
LnOX:xA (Ln is La, Y, Gd, and
At least one of Lu, X is at least one of Cl and Br, A is at least one of Ce and Tb, and x is 0<x<0.1
), MãX 2ã»
aMãXâ² 2 :xEu 2+ (where Mã is Ba, Sr and Ca
at least one alkaline earth metal selected from the group consisting of; X and X' are at least one halogen selected from the group consisting of Cl, Br, and Xâ X', and a is
It is a numerical value in the range of 0.1âŠaâŠ10.0, and x is 0<x
A numerical value in the range of âŠ0.2).
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ã«ã€ããŠãèšçœ®ããããšã奜ãŸããã In a normal radiation image storage panel, as mentioned above, a transparent protective film is provided on the surface of the phosphor layer on the side opposite to the side that contacts the support to physically and chemically protect the phosphor layer. It is being Such a transparent protective film is preferably provided also in the radiation image conversion panel of the present invention.
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20ÎŒmãšããã®ãæãŸããã The transparent protective film may be made of a transparent material such as a cellulose derivative such as cellulose acetate or nitrocellulose; or a synthetic polymeric material such as polymethyl methacrylate, polyvinyl butyral, polyvinyl formal, polycarbonate, polyvinyl acetate, vinyl chloride, or vinyl acetate copolymer. It can be formed by coating the surface of the phosphor layer with a solution prepared by dissolving a polymeric substance in an appropriate solvent. Alternatively, it can also be formed by a method such as adhering a transparent thin film separately formed from polyethylene terephthalate, polyethylene, polyvinylidene chloride, polyamide, etc. to the surface of the phosphor layer using a suitable adhesive. The thickness of the transparent protective film formed in this way is approximately 0.1 to
It is desirable to set it to 20ÎŒm.
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ããå®æœäŸã¯æ¬çºæãå¶éãããã®ã§ã¯ãªãã Next, examples of the present invention will be described. However, these Examples do not limit the present invention.
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å¡©åã»ã·ãŠã ïŒCsClïŒ186.4gãããã³åŒåãã¹
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æ··åãããExample 1 186.4 g of cesium chloride (CsCl) and 0.266 g of bismuth fluoride (BiF 3 ) were thoroughly mixed using a ball mill.
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ç©ãçå€ã«åãåºããŠå·åŽããã Next, the obtained phosphor raw material mixture was filled into an alumina crucible, which was then placed in a high-temperature electric furnace and fired. Firing is carried out in air at a temperature of 600â for 2
After the firing, which took a long time, was completed, the fired product was taken out of the furnace and cooled.
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äœïŒCsClïŒ0.001BiïŒãåŸãã In this way, a powdered bismuth-activated cesium chloride phosphor (CsCl: 0.001Bi) was obtained.
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ïŒCsBrïŒ0.001BiïŒãåŸããExample 2 By performing the same procedure as in Example 1 except for using 212.8 g of cesium bromide (CsBr) instead of cesium chloride,
A powdered bismuth-activated cesium bromide phosphor (CsBr: 0.001Bi) was obtained.
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0.001BiïŒãåŸããExample 3 A powdered bismuth-activated cesium iodide phosphor was produced by performing the same procedure as in Example 1 except for using 259.8 g of cesium iodide (CsI) instead of cesium chloride. (CsI:
0.001Bi) was obtained.
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ïŒå³ã«ç€ºãã Next, each of the phosphors obtained in Examples 1 to 3 was irradiated with X-rays at a tube voltage of 80 KVp, and the stimulated emission spectra were measured when excited with He-Ne laser light (wavelength: 632.8 nm). did. The results obtained are shown in FIG.
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ã§ããã In Figure 2, Curve 1: Stimulated emission spectrum of CsCl:0.001Bi phosphor (Example 1) Curve 2: Stimulated emission spectrum of CsBr:0.001Bi phosphor (Example 2) Curve 3: Stimulated emission spectrum of CsI:0.001Bi It is a stimulated emission spectrum of the phosphor (Example 3).
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枬å®ãããåŸãããçµæã第ïŒå³ã«ç€ºãã In addition, after irradiating each phosphor obtained in Examples 1 to 3 with X-rays at a tube voltage of 80 KVp,
The photostimulation excitation spectrum at the peak emission wavelength of each phosphor when excited with light in the wavelength range was measured. The results obtained are shown in FIG.
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ã§ããã In Figure 1, Curve 1: Stimulated excitation spectrum of Cscl: 0.001Bi phosphor (Example 1) Curve 2: Stimulated excitation spectrum of CsBr: 0.001Bi phosphor (Example 2) Curve 3: CsI: 0.001Bi It is a photostimulation excitation spectrum of the phosphor (Example 3).
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ããExample 4 A radiation image conversion panel was manufactured using each of the three types of bismuth-activated cesium halide phosphors obtained in Examples 1 to 3 by the method described below.
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ã調補ããã First, methyl ethyl ketone was added to a mixture of phosphor particles and linear polyester resin, and nitrocellulose with a degree of nitrification of 11.5% was further added to prepare a dispersion containing the phosphor in a dispersed state. next,
After adding tricresyl phosphate, n-butanol, and methyl ethyl ketone to this dispersion, they were stirred and mixed thoroughly using a propeller mixer to ensure that the phosphor was uniformly dispersed and that the mixing ratio of the binder and the phosphor was 1. :10, a coating liquid with a viscosity of 25 to 35 PS (25°C) was prepared.
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æããã Next, the coating solution was uniformly applied using a doctor blade onto a titanium dioxide-mixed polyethylene terephthalate sheet (support, thickness: 250 ÎŒm) placed horizontally on a glass plate. After coating, the support on which the coating film has been formed is placed in a dryer,
The temperature inside this dryer was gradually raised from 25°C to 100°C to dry the coating film. In this way, a phosphor layer with a layer thickness of 250 Όm was formed on the support.
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åŸãã Then, a transparent film of polyethylene terephthalate (thickness: 12 ÎŒm, coated with a polyester adhesive) is placed on top of this phosphor layer with the adhesive layer side facing down, and bonded.
A transparent protective film was formed to obtain a radiation image storage panel composed of a support, a phosphor layer, and a transparent protective film.
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ã第ïŒè¡šã«ç€ºãã Next, each radiation image conversion panel obtained in Example 4 was irradiated with X-rays with a tube voltage of 80 KVp, and then He-Ne
The sensitivity (stimulated luminance) of the panel was measured by excitation with laser light. This sensitivity measurement was performed using a filter on the light receiving side with a peak wavelength of 390 nm and a half-value width of 390 nm.
A bandpass filter (B-390) with a peak wavelength transmittance of 78% at 60 nm was used. The results are shown in Table 1.
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100ãšããçžå¯Ÿå€ã§ç€ºãããŠããã In addition, in Table 1, the sensitivity is the same as in Example 3.
CsI: 0.001Bi The sensitivity of the panel using phosphor is
It is expressed as a relative value of 100.
第ïŒè¡š çžå¯Ÿæ床 CsClïŒ0.001Bièå äœ ïŒå®æœäŸïŒïŒäœ¿çšã®ããã« 500 CsBrïŒ0.001Bièå äœ ïŒå®æœäŸïŒïŒäœ¿çšã®ããã« 700 CsIïŒ0.001Bièå äœ ïŒå®æœäŸïŒïŒäœ¿çšã®ããã« 100 Table 1 Relative sensitivity CsCl: 0.001Bi phosphor (Example 1) Panel used 500 CsBr: 0.001Bi phosphor (Example 2) Panel used 700 CsI: 0.001Bi phosphor (Example 3) Panel used 100
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FIG. 1 shows a CsCl:0.001Bi phosphor, which is a specific example of the bismuth-activated cesium halide phosphor of the present invention.
Figure 3 is the photostimulation excitation spectra of CsBr:0.001Bi phosphor and CsI:0.001Bi phosphor (curves 1, 2 and 3, respectively). FIG. 2 shows CsCl, which is a specific example of the bismuth-activated cesium halide phosphor of the present invention:
0.001Bi phosphor, CsBr: 0.001Bi phosphor and
Stimulated emission spectra of CsI:0.001Bi phosphor (curves 1, 2 and 3, respectively). FIG. 3 is a schematic diagram illustrating the radiation image conversion method used in the present invention. 11: Radiation generator, 12: Subject, 13:
Radiation image conversion panel, 14: light source, 15: photoelectric conversion device, 16: image reproduction device, 17: image display device, 18: filter.
Claims (1)
ãããæŸå°ç·ããäžèšçµæåŒïŒïŒã§è¡šãããã
ãã¹ãã¹è³ŠæŽ»ã»ã·ãŠã ãã©ã€ãèå äœã«åžåãã
ãã®ã¡ããã®èå äœã«450ã900nmã®æ³¢é·é åã®
é»ç£æ³¢ãç §å°ããããšã«ããã該èå äœã«èç©ã
ããŠããæŸå°ç·ãšãã«ã®ãŒãèå ãšããŠæŸåºã
ãããããŠãã®èå ãæ€åºããããšãç¹åŸŽãšãã
æŸå°ç·åå€ææ¹æ³ã çµæåŒïŒïŒïŒ CsXïŒxBi ïŒïŒ ïŒãã ããã¯ClãŸãã¯BrãŸãã¯ã®ãããã
äžçš®ã§ããïŒãããŠïœã¯ïŒïŒïœâŠ0.2ã®ç¯å²ã®æ°
å€ã§ããïŒ ïŒ çµæåŒïŒïŒã«ãããïœãïŒÃ10-4âŠïœâŠ
10-2ã®ç¯å²ã®æ°å€ã§ããç¹èš±è«æ±ã®ç¯å²ç¬¬ïŒé èš
èŒã®æŸå°ç·åå€ææ¹æ³ã ïŒ é»ç£æ³¢ã500ã850nmã®æ³¢é·é åã®é»ç£æ³¢ã§
ããç¹èš±è«æ±ã®ç¯å²ç¬¬ïŒé èšèŒã®æŸå°ç·åå€ææ¹
æ³ã ïŒ é»ç£æ³¢ãã¬ãŒã¶ãŒå ã§ããç¹èš±è«æ±ã®ç¯å²ç¬¬
ïŒé èšèŒã®æŸå°ç·åå€ææ¹æ³ã ïŒ æ¯æäœãšããã®æ¯æäœäžã«èšããããèŒå°œæ§
èå äœãåæ£ç¶æ ã§å«ææ¯æããçµåå€ãããªã
å°ãªããšãäžå±€ã®èå äœå±€ãšããå®è³ªçã«æ§æã
ããŠããã該èå äœå±€ã®ãã¡ã®å°ãªããšãäžå±€
ããäžèšçµæåŒïŒïŒã§è¡šãããããã¹ãã¹è³ŠæŽ»
ã»ã·ãŠã ãã©ã€ãèå äœãå«æããããšãç¹åŸŽãš
ããæŸå°ç·åå€æããã«ã çµæåŒïŒïŒïŒ CsXïŒxBi ïŒïŒ ïŒãã ããã¯ClãŸãã¯BrãŸãã¯ã®ãããã
äžçš®ã§ããïŒãããŠïœã¯ïŒïŒïœâŠ0.2ã®ç¯å²ã®æ°
å€ã§ããïŒ ïŒ çµæåŒïŒïŒã«ãããïœãïŒÃ10-4âŠïœâŠ
10-2ã®ç¯å²ã®æ°å€ã§ããç¹èš±è«æ±ã®ç¯å²ç¬¬ïŒé èš
èŒã®æŸå°ç·åå€æããã«ã[Claims] 1. After the radiation transmitted through the subject or emitted from the subject is absorbed into a bismuth-activated cesium halide phosphor represented by the following compositional formula (), this phosphor is injected with 450 to 900 nm wavelength radiation. A radiation image conversion method comprising: emitting radiation energy stored in the phosphor as fluorescence by irradiating electromagnetic waves in a wavelength range; and detecting this fluorescence. Compositional formula (): CsX:xBi () (However, X is either Cl or Br; and x is a numerical value in the range of 0<xâŠ0.2) 2 In the compositional formula (), x is 5 Ã10 -4 âŠxâŠ
10. The radiation image conversion method according to claim 1, wherein the value is in the range of 10-2 . 3. The radiation image conversion method according to claim 1, wherein the electromagnetic waves are electromagnetic waves in a wavelength range of 500 to 850 nm. 4. The radiation image conversion method according to claim 1, wherein the electromagnetic wave is a laser beam. 5 Substantially composed of a support and at least one phosphor layer made of a binder containing and supporting the stimulable phosphor in a dispersed state provided on the support; A radiation image conversion panel characterized in that at least one layer thereof contains a bismuth-activated cesium halide phosphor represented by the following compositional formula (). Compositional formula (): CsX:xBi () (However, X is either Cl or Br; and x is a numerical value in the range of 0<xâŠ0.2) 6 In the compositional formula (), x is 5 Ã10 -4 âŠxâŠ
The radiation image conversion panel according to claim 5, which has a numerical value in the range of 10 -2 .
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7048585A JPS61228400A (en) | 1985-04-02 | 1985-04-02 | Radiation image conversion method and radiation image conversion panel image conversion used therein |
| US06/846,919 US4780375A (en) | 1985-04-02 | 1986-04-01 | Phosphor, and radiation image storage panel |
| DE86104503T DE3688630T2 (en) | 1985-04-02 | 1986-04-02 | Phosphor, method for storing and reproducing a radiation image and screen for storing a radiation image. |
| EP86104503A EP0200017B1 (en) | 1985-04-02 | 1986-04-02 | Phosphor, radiation image recording and reproducing method and radiation image storage panel |
| US07/184,881 US4801806A (en) | 1985-04-02 | 1988-04-22 | Radiation image recording and reproducing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7048585A JPS61228400A (en) | 1985-04-02 | 1985-04-02 | Radiation image conversion method and radiation image conversion panel image conversion used therein |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61228400A JPS61228400A (en) | 1986-10-11 |
| JPH0554639B2 true JPH0554639B2 (en) | 1993-08-13 |
Family
ID=13432870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7048585A Granted JPS61228400A (en) | 1985-04-02 | 1985-04-02 | Radiation image conversion method and radiation image conversion panel image conversion used therein |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61228400A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3016630B2 (en) * | 1991-07-01 | 2000-03-06 | ã³ãã«æ ªåŒäŒç€Ÿ | Radiation image recording and reading device |
| JP2003248097A (en) | 2002-02-25 | 2003-09-05 | Konica Corp | Radiation image conversion panel and its production method |
| JP2008164339A (en) | 2006-12-27 | 2008-07-17 | Konica Minolta Medical & Graphic Inc | Radiological image conversion panel |
-
1985
- 1985-04-02 JP JP7048585A patent/JPS61228400A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61228400A (en) | 1986-10-11 |
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