ELECTRICAL SAFETY DEVICES 3 Flashcards
1
Q
What are the three categories of subsidiary circuits interlocked with the exposure interlock circuit?
A
- Electrical safety interlock circuit
- Mechanical interlock circuit
- Radiation safety interlock circuit
2
Q
What is the purpose of the initial delay circuit in radiography equipment?
A
- To hold back the operation of another circuit so that components have time to reach their proper operating conditions.
- Allows time for the tube filament to reach operating temperature and the rotating anode to reach correct speed.
3
Q
What does the anode stator supply interlock circuit prevent?
A
- Prevents overheating of the anode target track in a rotating anode X-ray tube.
- Stops exposure if the anode is stationary or slow running to prevent severe damage to the target surface.
4
Q
What is the function of the tube filament interlock?
A
- Ensures an exposure cannot be made until the filament circuit is switched on and the filaments reach full working temperature.
- Uses a switch in series with the primary of the tube filament circuit and a filament boost system.
5
Q
How does the X-ray tube overload protection circuit work?
A
- Protects the X-ray tube from electrical overload.
- May include a mechanical block to prevent selecting exposure factors that exceed tube rating.
- Can provide single load protection (general X-ray) or serial load protection (cineradiography).
6
Q
What is the Loadix system used for in specialized radiography systems?
A
- Uses a heat sensor to measure the heat radiated from the anode.
- Provides a visual indication of tube thermal loading on the control panel.
- Useful for examinations requiring heavy loading of the anode.
7
Q
What are some features of the mechanical interlock circuit linked to the exposure interlock circuit?
A
- Mobile machine fitted switch ‘bumper’
- Motorized moving table top
- Fluoroscopy table tilt
- Motor-driven tube column
8
Q
A
