US3869635A - Rotary anode for an x-ray tube - Google Patents

Rotary anode for an x-ray tube Download PDF

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Publication number
US3869635A
US3869635A US369393A US36939373A US3869635A US 3869635 A US3869635 A US 3869635A US 369393 A US369393 A US 369393A US 36939373 A US36939373 A US 36939373A US 3869635 A US3869635 A US 3869635A
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US
United States
Prior art keywords
molybdenum
ray tube
rotary anode
percent
rays
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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 - Lifetime
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US369393A
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English (en)
Inventor
Rudolf Friedel
Karl Sedlatschek
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Siemens AG
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Siemens AG
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Filing date
Publication date
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    • 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
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/08—Targets (anodes) and X-ray converters
    • H01J2235/083—Bonding or fixing with the support or substrate
    • H01J2235/084—Target-substrate interlayers or structures, e.g. to control or prevent diffusion or improve adhesion

Definitions

  • ABSTRACT A rotary anode of an X-ray tube delivers X-rays from at least the surface struck by electrons and consisting mostly of molybdenum. According to the present invention this surface consists to at least percent of molybdenum and up to 10 percent hafnium.
  • Such anodes are used primarily in soft ray diagnosis, for example, in examination of female breasts.
  • a drawback is that anodes made of molybdenum or molybdenum alloys have a quick drop in ray delivery. This drop shows outwardly in the anodes in the form of a roughened surface.
  • An object of the present invention is to eliminate at least to a great extent the drop in the ray production and its cause, namely, the roughened surface.
  • the present invention pertains to a rotary anode of an X-ray tube which produces X-rays at locations struck by electrons and consisting primarily of molybdenum.
  • a rotary anode of an X-ray tube which produces X-rays at locations struck by electrons and consisting primarily of molybdenum.
  • the rotary anode is a compound body consisting of a plate having a thickness of about 10 mm of molybdenum or another material resistant to high temperatures, for example, graphite, which is coated with a layer having usually the thickness of l to 2 mm and consisting of a molybdenum-hafnium.alloy.
  • a supporting body of graphite it is advantageous to apply a diffusion diminishing intermediate layer. for example of tantalum, before applying the alloy.
  • the anode can also be a single body consisting of a molybdenumhafnium alloy. For the special use in female breasts examination it is best to use an alloy of 95 percent molybdenum and 5 percent hafnium.
  • haf nium as an alloy part of molybdenum in accordance with the present invention has very good results concerning the diminution of rawness without producing any noticeably worse contrast of X-ray exposure. Even 1% of hafnium in the alloy substantially diminishes the rawness of molybdenum, so that a continuously im proved ray output is produced.
  • FIG. 1 is a side view partly in section of an X-ray tube with a rotary anode carrying a molybdenum alloy at the focal point path.
  • FIG. 2 is section through a rotary anode for use with the tube shown in FIG. 1.
  • FIG. 1 shows an X-ray tube 2 with a container I having at one end the cathode arrangement 3 and at the other end the anode arrangement 4.
  • the cathode de vice is fixed by a sleeve 5 to one end of the container 1 and has a shoulder 6 carrying the actual glow cathode.
  • the cathode device at the other end of the tube container 1 is the anode device carrying a rotor 7 for driving the rotary anode 9 connected with it by an axle 8.
  • the rotary anode consists of a plate 10 which is 10 mm thick and consists of an alloy of molybdenum with 5 percent tungsten.
  • the plate I0 is pressed by a screw 11 against a bearing'l2 of the axle 8; it can be rotated by the rotor 7 and a stator (not shown).
  • the outer surface of the plate 10 directed to the cathode device 3 has an annular zone located upon its outer edge and carrying acoating 13 which has a thickness of 1 mm and which consists of an alloy containing 95 percent molybdenum and 5 percent hafnium.
  • a rotary anode for an X-ray tube having a surface struck by electrons and producing X-rays, said surface consisting of 95 percent molybdenum and 5 percent hafnium.
  • a rotary anode for an X-ray tube having a surface struck by electrons and producing X-rays, said surface containing up to 10 percent hafmium and a' balance of molybclemum comprising a body consisting of graphite covered with a diffusion delaying intermediate layer between said body and the said surface consisting of a molybdenum-hafnium alloy.
  • a rotary anode for an X-ray tube having a surface struck by electrons and producing X-rays, said surface containing up to 10 percent hafmium and a balance of molybclemum comprising a body consisting of graphite covered with a diffusing delaying intermediate layer consisting of tantalum which is covered with a layer of

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  • X-Ray Techniques (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
US369393A 1972-06-28 1973-06-12 Rotary anode for an x-ray tube Expired - Lifetime US3869635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2231686A DE2231686A1 (de) 1972-06-28 1972-06-28 Roentgenroehren-drehanode

Publications (1)

Publication Number Publication Date
US3869635A true US3869635A (en) 1975-03-04

Family

ID=5849093

Family Applications (1)

Application Number Title Priority Date Filing Date
US369393A Expired - Lifetime US3869635A (en) 1972-06-28 1973-06-12 Rotary anode for an x-ray tube

Country Status (5)

Country Link
US (1) US3869635A (cs)
JP (1) JPS4945692A (cs)
DE (1) DE2231686A1 (cs)
FR (1) FR2191261B1 (cs)
NL (1) NL7308639A (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777643A (en) * 1985-02-15 1988-10-11 General Electric Company Composite rotary anode for x-ray tube and process for preparing the composite
US4876705A (en) * 1987-11-13 1989-10-24 General Electric Cgr S.A. X-ray tube with a molybdenum target

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195247A (en) * 1978-07-24 1980-03-25 General Electric Company X-ray target with substrate of molybdenum alloy
AT384323B (de) * 1985-07-11 1987-10-27 Plansee Metallwerk Drehanode fuer roentgenroehren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169860A (en) * 1962-04-30 1965-02-16 American Metal Climax Inc Molybdenum-hafnium alloy casting
US3689795A (en) * 1970-06-02 1972-09-05 Schwarzkopf Dev Co Boron-containing rotating x-ray target
US3737699A (en) * 1972-05-18 1973-06-05 Picker Corp X-ray tube having anode target layer of molybdenum rhenium alloy

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR615280A (fr) * 1925-09-14 1927-01-04 Philips Nv Anticathode pour des tubes à rayons chi
DE896234C (de) * 1943-04-22 1953-11-09 Peter Dr Kniepen Roentgenroehre
FR1356047A (fr) * 1962-04-30 1964-03-20 Thomson Houston Comp Francaise Cible monocristalline pour tube à rayon x

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169860A (en) * 1962-04-30 1965-02-16 American Metal Climax Inc Molybdenum-hafnium alloy casting
US3689795A (en) * 1970-06-02 1972-09-05 Schwarzkopf Dev Co Boron-containing rotating x-ray target
US3737699A (en) * 1972-05-18 1973-06-05 Picker Corp X-ray tube having anode target layer of molybdenum rhenium alloy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777643A (en) * 1985-02-15 1988-10-11 General Electric Company Composite rotary anode for x-ray tube and process for preparing the composite
US4876705A (en) * 1987-11-13 1989-10-24 General Electric Cgr S.A. X-ray tube with a molybdenum target

Also Published As

Publication number Publication date
NL7308639A (cs) 1974-01-02
FR2191261A1 (cs) 1974-02-01
FR2191261B1 (cs) 1978-02-17
DE2231686A1 (de) 1974-01-17
JPS4945692A (cs) 1974-05-01

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