Why we use thoriated tungsten cathodes? - PowerPoint PPT Presentation

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Why we use thoriated tungsten cathodes?

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Why we use thoriated tungsten cathodes? COST 529 Eindhoven, 2006.March.31. I.Gaal, L.Bartha Electron emission micrographs of thoriated tungsten wire Fig.1: As drawn ... – PowerPoint PPT presentation

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Title: Why we use thoriated tungsten cathodes?


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Why we use thoriated tungsten cathodes?
  • COST 529
  • Eindhoven, 2006.March.31.
  • I.Gaal, L.Bartha

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  • Electron emission micrographs of thoriated
    tungsten wire
  • Fig.1 As drawn, fibrous state. All others
    Recrystallised state
  • All pictures are made at the same surface
    location. Time sequence 6-8 sec between each
    part

4
Transport of W in halogen lamp
  • 220V/650W halogen studio lamp labelled with W185
    isotope
  • Autoradiogram of filament sections after 10 hours
    of burning

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..
  • 220V/1000W halogen lamp labelled with Ta182
    annealed
  • 1.) 180V, 2 hours
  • Deposition on surface
  • 2.) 220V, 8 hours
  • Diffusion into the coil
  • 3.)Co 60 annealed 220V
  • Co deposition at the central part, onto the inner
    side of the coil

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