GB1099782A - Improvements in or relating to activated thermionic sources and to a method of producing same - Google Patents

Improvements in or relating to activated thermionic sources and to a method of producing same

Info

Publication number
GB1099782A
GB1099782A GB1203565A GB1203565A GB1099782A GB 1099782 A GB1099782 A GB 1099782A GB 1203565 A GB1203565 A GB 1203565A GB 1203565 A GB1203565 A GB 1203565A GB 1099782 A GB1099782 A GB 1099782A
Authority
GB
United Kingdom
Prior art keywords
filament
activating substance
analysed
march
coated
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
Application number
GB1203565A
Inventor
Georges Durand
Charles Kosztolanyl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of GB1099782A publication Critical patent/GB1099782A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J27/00—Ion beam tubes
    • H01J27/02—Ion sources; Ion guns
    • H01J27/26—Ion sources; Ion guns using surface ionisation, e.g. field effect ion sources, thermionic ion sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/02—Details
    • H01J49/10—Ion sources; Ion guns
    • H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission

Abstract

1,099,782. Thermionic ion sources. COMMISSARIAT A L'ENERGIE ATOMIQUE. March 22, 1965 [March 27, 1964], No. 12035/65. Heading H1D. A thermionic ion source for use in a mass spectrometer comprises a heating filament coated with a porous layer of an activating substance, which increases the work function of the filament surface, and an outer layer containing a mixture of the activating substance with the sample to be analysed. In particular, a Pt, Re or W filament may be coated with a refractory substance having poor thermal and electrical conductivity, which may, for example, be one or more of MgSiO 3 , ThSiO 4 , SiO 2 and ZrO 2 in the form of a hydrated gel. A heating current is passed through the filament to evaporate the water from the hydrated gel and leave a porous layer of the activating substance on the filament surface, which is then charged with the outer layer and subjected to a further calcination. The thickness of the filament coating may be 0À2 to 1 mm., e.g. 0À5 mm. The product to be analysed may be galena, zircon or other ore containing traces of Pb. The source may also be used in the isotopic analysis of other elements, e.g. U or Th.
GB1203565A 1964-03-27 1965-03-22 Improvements in or relating to activated thermionic sources and to a method of producing same Expired GB1099782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR968986A FR1398136A (en) 1964-03-27 1964-03-27 Process for activating thermionic sources and thermionic source in accordance with those obtained by applying said process or a similar process

Publications (1)

Publication Number Publication Date
GB1099782A true GB1099782A (en) 1968-01-17

Family

ID=8826562

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1203565A Expired GB1099782A (en) 1964-03-27 1965-03-22 Improvements in or relating to activated thermionic sources and to a method of producing same

Country Status (10)

Country Link
BE (1) BE661231A (en)
CH (1) CH432055A (en)
DE (1) DE1297901B (en)
ES (1) ES311083A1 (en)
FR (1) FR1398136A (en)
GB (1) GB1099782A (en)
IL (1) IL23202A (en)
LU (1) LU48248A1 (en)
NL (1) NL6503984A (en)
SE (1) SE302647B (en)

Also Published As

Publication number Publication date
SE302647B (en) 1968-07-29
FR1398136A (en) 1965-05-07
LU48248A1 (en) 1965-05-24
NL6503984A (en) 1965-09-28
ES311083A1 (en) 1966-04-16
DE1297901B (en) 1969-06-19
IL23202A (en) 1968-09-26
BE661231A (en) 1965-07-16
CH432055A (en) 1967-03-15

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