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Anodes are positive electrodes of x-ray tubes and these are of two types:
- Stationary anode
- Rotating anode
For simplicity point of view lets discuss stationary anodes first. Moreover they are basic and conventional, many of its principles are also applied in other types of anodes.
Stationary anode:
A tungsten plate of usually square or rectangle in shape of 2-3 mm thick embedded in a large mass of copper forms the basis of stationary anode. The choice of tungsten material is due to several reason, some of them are listed below.
- It has a high atomic number (74), which is more efficient to produce more x-rays,
- It has high melting point 3370 C, so can sustain at high temperature.
- Tungsten is a reasonably good material for the absorption of heat.
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