Components of an X-ray tube Flashcards
What is the Tube insert?
An inner housing vacuum around the inner components
What is the cathode block?
This is the negative terminal of the tube
What is the Filament?
A linear spiral mounted in the focusing cup which has its own electrical supply to produce the space charge
Name 5 features of the filament
- Made of tungsten
- High melting point
- Ductile
- Low work function
- Low vapour pressure
What is the Focusing Cup?
Elongated deep open structure connected to highly negative output which holds electrons around the
filament as a space charge aswell as repelling electrons from filament
Name the two different sizes of filament inside the
focussing cup
Fine focus
Broad focus
What other function can the focusing cup be used for?
As a switch
What does increasing the charge on the focussing cup do?
Holds electons in a cloud near the focussing cup, when the charge on the focussing cup is reduced this allows the electrons to flood across the x-ray tube instantly
Name 5 features of the Stationary Anode
- Made of tungsten
- High melting point
- Low vaporisation pressure
- High atomic number
- Can form a durable block
Increasing the anode angle does what the the anode heel effect?
Decreases Andone heel effect
They are inversely proportional
The Rotating Anode is made of 3 sections, what are they?
Focal track
Disc
Disc backing
How is Anode rotation achieved?
Electromagnetic induction from an alternating current producing a magnetic field
What is the Glass envelope?
Evacuated container which provides electrical insulation
Name 5 features of the Glass envelope
- Borosilicate glass
- Heat resistant
- Strong
- Electrical insulator
- Radiolucent
Name 5 features of the Tube Housing?
- Aluminium or mild steel
- Securely contains the oil
- Radiation protection
- Provides tube port
- Electrical safety