GB837172A - Improvements in or relating to x-ray apparatus - Google Patents
Improvements in or relating to x-ray apparatusInfo
- Publication number
- GB837172A GB837172A GB7051/58A GB705158A GB837172A GB 837172 A GB837172 A GB 837172A GB 7051/58 A GB7051/58 A GB 7051/58A GB 705158 A GB705158 A GB 705158A GB 837172 A GB837172 A GB 837172A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ray
- screen
- signal
- irradiation
- rays
- 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
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/64—Circuit arrangements for X-ray apparatus incorporating image intensifiers
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Luminescent Compositions (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
837,172. X-ray responsive electroluminescent screens. WESTINGHOUSE ELECTRIC CORPORATION. March 5, 1958 [March 13, 1957], No. 7051/58. Class 39(1). The contrast in the luminous response to an X-ray signal of a phosphor screen displaying an enhanced electroluminescent output when irradiated by X-rays and simultaneously excited by an alternating electric field is varied by the following steps:-passing X-rays of selected intensity through a stationary object having varying X-ray permeability to generate a first X-ray signal which is applied to the screen together wtih an alternating electric field to effect a phosphor-screen presentisization varying in degree according to the quantity of X-rays applied thereto, removing the applied X-ray signal and the applied field, repassing X-rays of preselected intensity through the object to generate a second signal, and applying this signal to the screen to produce thereon a transient luminous object image varying in luminosity with the varying X-ray intensity of the second X-ray signal and with the degree of screen presensitization previously effected whereby the contrast between individual portions of the transient object image formed on the screen is varied. The applied first X-ray signal may be removed before or simultaneously with the applied electric field. In the example recited the brightness of a portion of the screen receiving through the object first X-ray irradiation of 160 ÁA per minute and an applied electric field is shown as O-T-U, Fig. 5 and, for the screen portions adjacent the more X-ray opaque portion of the object with an irradiation of 80ÁA per minute the brightness is shown as O T<SP>1</SP> U<SP>1</SP>. The first X-ray signal and the applied field are removed and after a quiescent time of about one minute, the second X-ray irradiation is applied to the presensitized screen. The brightness curves of the " high " and " low " spots after this irradiation are hsown as OXY and OX<SP>1</SP>Y<SP>1</SP>, the contract ratio to the peaks X, X<SP>1</SP> being greater than that in the presensitization image. The contrast ratio may be lowered by using lower X-ray strengths in the second irradiation. The phosphor screen construction is of the kind described in Specification 772,572. The electroluminescent material may be mixtures of zinc and cadmium sulphide wherein the ratio of Zn to Cd is from 9 : 1 to 3 : 7 activated by from 0À01 x 10-<SP>2</SP> to 6À0 x 10-<SP>2</SP> mole of manganese. Silver may also be present from a mere trace up to 1À0 x 10<SP>-2</SP> mole Ag per mole Mn. Specification 837,171 also is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US645742A US2885560A (en) | 1957-03-13 | 1957-03-13 | X-ray method |
Publications (1)
Publication Number | Publication Date |
---|---|
GB837172A true GB837172A (en) | 1960-06-09 |
Family
ID=24590288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7051/58A Expired GB837172A (en) | 1957-03-13 | 1958-03-05 | Improvements in or relating to x-ray apparatus |
Country Status (5)
Country | Link |
---|---|
US (1) | US2885560A (en) |
JP (1) | JPS3411028B1 (en) |
DE (1) | DE1048645C2 (en) |
FR (1) | FR1189995A (en) |
GB (1) | GB837172A (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3096458A (en) * | 1960-07-19 | 1963-07-02 | Rca Corp | Electroluminescent device |
US3148276A (en) * | 1960-10-17 | 1964-09-08 | Edgerton Germeshausen & Grier | Method of increasing the response of photographic emulsions to radiation |
US3155861A (en) * | 1961-02-08 | 1964-11-03 | Westinghouse Electric Corp | Method for operating electroluminescent device |
US3233247A (en) * | 1963-08-28 | 1966-02-01 | Sylvania Electric Prod | Electroluminescent photographic reproduction device |
US3398021A (en) * | 1965-03-23 | 1968-08-20 | Hughes Aircraft Co | Method of making thin film field sustained conductivity device |
US3346756A (en) * | 1965-04-13 | 1967-10-10 | Robert J Doyle | Electrode support for an optical fiber disc |
US3430088A (en) * | 1966-09-30 | 1969-02-25 | Gen Electric | Wire terminal electroluminescent device and manufacture |
US3673450A (en) * | 1970-01-30 | 1972-06-27 | Spectra Tech Corp | Electroluminescent techniques and devices |
-
1957
- 1957-03-13 US US645742A patent/US2885560A/en not_active Expired - Lifetime
- 1957-10-11 FR FR1189995D patent/FR1189995A/en not_active Expired
-
1958
- 1958-02-22 DE DE1958W0022831 patent/DE1048645C2/de not_active Expired
- 1958-03-05 GB GB7051/58A patent/GB837172A/en not_active Expired
- 1958-03-12 JP JP642858A patent/JPS3411028B1/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1048645B (en) | 1959-01-15 |
JPS3411028B1 (en) | 1959-12-26 |
US2885560A (en) | 1959-05-05 |
FR1189995A (en) | 1959-10-08 |
DE1048645C2 (en) | 1959-07-09 |
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