x ray tube construction

• draw and label an x ray tube 


  remember this !!

  
• what is the cathode 


  • compromised of the filament and focusing cup
  • negative end of the x ray tube
  • source of electrons
  • electrons are released from the filament via thermionic emission
• what is the anode


  • rotating disc made of tungsten
  • positive end of the tube
  • provided target for electron interaction to produce x rays
  • converts kinetic energy from electrons to x ray photons
• what is the filament 


  • a coil of tungsten
  • provides the source of electrons required for x ray production
• what is the role of the vacuum


  prevents electrons from interacting with particles that would scatter then
• what is the role of tube housing


  • lead lined and protects the x ray tube
  • provides radiation shielding
  • provides protection from the live components of x ray tube
• what is the role of the focusing cup

  • a shallow depression in the surface of the cathode
  • purpose is to focus the electrons emitted from the filament onto the focal track
• what is the role of the collimators


  metal devices that determine the size of the x ray field
• what is the role of the glass envelope 


  • made of pyrex
  • provides support and electrical insulation for the anode and cathode
  • maintains a vacuum within the tube
• what is the role of oil


  • acts as an electrical insulator
  • helps to dissipate heat