GB240166A - Improvements in and relating to electron discharge devices - Google Patents
Improvements in and relating to electron discharge devicesInfo
- Publication number
- GB240166A GB240166A GB23210/25A GB2321025A GB240166A GB 240166 A GB240166 A GB 240166A GB 23210/25 A GB23210/25 A GB 23210/25A GB 2321025 A GB2321025 A GB 2321025A GB 240166 A GB240166 A GB 240166A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- shield
- uranium
- parts
- rod
- 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
- 229910052770 Uranium Inorganic materials 0.000 abstract 5
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract 5
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- 229910052776 Thorium Inorganic materials 0.000 abstract 2
- 229910052802 copper Inorganic materials 0.000 abstract 2
- 239000010949 copper Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 2
- 229910052721 tungsten Inorganic materials 0.000 abstract 2
- 239000010937 tungsten Substances 0.000 abstract 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 230000002745 absorbent Effects 0.000 abstract 1
- 239000002250 absorbent Substances 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000005686 electrostatic field Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/06—Cathodes
- H01J35/064—Details of the emitter, e.g. material or structure
Landscapes
- X-Ray Techniques (AREA)
- Microwave Tubes (AREA)
Abstract
240,166. British Thomson-Houston Co., Ltd., (Assignees of Coolidge, W. D.). Sept. 17, 1924, [Convention date]. R÷ntgen-ray tubes; vacuum tubes. - In a tube having a tungsten cathode and a member such as an anode consisting of a metal, for instance uranium or thorium, having a higher electron emissivity than tungsten, an electrostatic device is so arranged about the cathode that an increase of space current due to an increased emission from volatilizable metal deposited on the cathode is suppressed. As shown, a spiral cathode 13 is mounted in a cylindrical focusing shield 14 of molybdenum, and the ends of the cathode areconnected to the shield and to a central rod 15 at points removed from the mouth of the shield. The main part of the cathode is located near themouth of the shield and is heated to a temperature of 2500‹ F. which is sufficiently high to prevent deposition of uranium. The cooler partsof the cathode on which a deposit of uranium may take place are subjected to a strong electrostatic field and the consequent increased emission is thereby controlled so as to have no effect on the space current. The rod 15 projects beyond the spiral so as to broaden the focus. A flange 18 on the shield protects the parts behind the cathode from ionic bombardment during exhaustion. Uranium and thorium may act as a gas absorbent. In a modification the ends of the cathode are connected to parts nearer to themouth of the shield than as shown, and theelectrostatic field at those parts is increased by forming the shield with an inturned flange and the rod with a disc-shaped flange. In a furtherarrangement the whole of the cathode is mounted at a distance from the mouth of the shield. The anticathode may consist of a target of uranium. brazed to a copper backing by an alloy consisting of 28 parts of copper and 72 parts of silver, a cooling tube being brazed behind the backing. Specification 109,358 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US738246A US1684263A (en) | 1924-09-17 | 1924-09-17 | Hot-cathode device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB240166A true GB240166A (en) | 1926-03-11 |
Family
ID=24967198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23210/25A Expired GB240166A (en) | 1924-09-17 | 1925-09-17 | Improvements in and relating to electron discharge devices |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1684263A (en) |
| DE (1) | DE483337C (en) |
| FR (1) | FR603584A (en) |
| GB (1) | GB240166A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003065772A3 (en) * | 2002-01-31 | 2004-02-26 | Univ Johns Hopkins | X-ray source and method for producing selectable x-ray wavelength |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3526799A (en) * | 1967-05-26 | 1970-09-01 | Gen Electric | Electron discharge device subject to hydrocarbon background pressure and having carbon-dissolving electrodes |
| DE2855905A1 (en) * | 1978-12-23 | 1980-06-26 | Licentia Gmbh | DEVICE WITH A X-RAY TUBE |
| NL8603264A (en) * | 1986-12-23 | 1988-07-18 | Philips Nv | ROENTGEN TUBE WITH A RING-SHAPED FOCUS. |
| US9240303B2 (en) * | 2013-09-10 | 2016-01-19 | Moxtek, Inc. | Dual tube support for electron emitter |
-
1924
- 1924-09-17 US US738246A patent/US1684263A/en not_active Expired - Lifetime
-
1925
- 1925-09-09 FR FR603584D patent/FR603584A/en not_active Expired
- 1925-09-13 DE DEA45885D patent/DE483337C/en not_active Expired
- 1925-09-17 GB GB23210/25A patent/GB240166A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003065772A3 (en) * | 2002-01-31 | 2004-02-26 | Univ Johns Hopkins | X-ray source and method for producing selectable x-ray wavelength |
| US7186022B2 (en) | 2002-01-31 | 2007-03-06 | The Johns Hopkins University | X-ray source and method for more efficiently producing selectable x-ray frequencies |
Also Published As
| Publication number | Publication date |
|---|---|
| FR603584A (en) | 1926-04-19 |
| US1684263A (en) | 1928-09-11 |
| DE483337C (en) | 1929-09-30 |
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