http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1501267-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3e9445e5e3626f36e932c6451a928250 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G21K4-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-0822 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C5-17 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-7733 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-68 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G21K4-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-84 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-77 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C5-17 |
| filingDate | 1975-04-04^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1978-02-15^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1501267-A |
| titleOfInvention | X-ray screens |
| abstract | 1501267 Luminescent screens CIBA-GEIGY AG 1 April 1976 [4 April 1975] 13885/75 Heading C4S [Also in Divisions H5 and C3] An X-ray intensifying screen comprises in a fluorescent layer a phosphor mixture of an alkaline earth fluorohalide activated with divalent Eu of formula where 0#y#0À20; x+y+p#1; a+b#1; x, a, b#0 and 0À001#p#0À20 together with at least one phosphor which is either calcium tungstate or a rare earth oxychalcogenide of empirical formula where M is at least one rare earth host element (which may include Y), A is a rare earth activator different from M and which is of At. No. 57 to 71, Ch is S, Se or Te and 0À001#x#0À2. There is preferably at least one of the oxychalcogenide phosphors. Many phosphors and phosphor combinations are disclosed. A screen may comprise a supporting base (opaque or transparent), a light reflecting layer, the phosphor layer and a protective layer, the light reflecting layer may be of baryta or titanium dioxide in polymeric binder or a thin film of Al or Ag (evaporated), and need not be present between the base and phosphor layer if the former is polyester, but may be on the other side of the support or separated therefrom. Also exemplified are phosphor proportions, phosphor/binder ratios, phosphor particle sizes (1-40 Á), phosphor coating wts., plasticizers, dyes or pigments for at least one of the phosphor, protective or light reflecting layers to increase sharpness by reducing light scatter and reflection, base and protective layer materials. Binders may be cellulose esters (e.g. cellulose acetate, triacetate, acetate butyrate, and nitrate) polyvinyl compounds (e.g. p.v.c. and polyvinyl butyral) and copolymers of vinyl compounds and solvent soluble polyesters. The screens may be a pair on each side a double coated X-ray film, or a single screen contacting a single sided X- ray film for mammography. The film may be sensitive to blue, or green and blue light, a green sensitive film being preferred for screens with one or more green emitting phosphors for maximum exposure reduction. Mottle reduction is also achieved. Detailed examples are included. Screens with barium fluorochloride and yttrium oxysulphide reduce exposure requirements by one quarter relative to conventional calcium tungstate screens, thus facilitating their introduction into clinical use. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2018095740-A1 |
| priorityDate | 1975-04-04^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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