cAPTER 6.... X RAY TUBE
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cathode and the anode. Each of these is an electrode, and any electronic tube with two electrodes is called
When x-rays are produced, they are emitted isotropically, that means....___
with equal intensity in all directions.
The x-rays emitted through the window are called the
X-rays that escape through the protective housing are called
The cathode is the__1___ side of the x-ray tube; it has two primary parts, a ___2__ and a __3___.
- 1 negative
- 2 filament
- 3 focusing cup
When the current through the filament is sufficiently high, the outer-shell electrons of the filament atoms are ‘boiled off’ and ejected from the filament. This phenomenon is known as -_____
Filaments are usually made of
The filament is embedded in a metal shroud called the_____
Filament current that has risen to its maximum value because all available electrons have been used IS CALLED
The anode is the_____ side of the x-ray tube.
There are two types of anodes,_____ and ______
The anode serves three functions in an x-ray tube
- electrical conductor
- mechanical support
- thermal dissipater.
The target is
the area of the anode struck by the electrons from the cathode.
Tungsten is the material of choice for the target for general radiography for three main reasons:
- Atomic number
- Thermal conductivity
- High melting point
the area of the target from which x-rays are emitted.
The focal spot
The intensity of x-rays that are emitted through the ‘heel’ of the target is reduced because they have a longer path through the target and therefore increased absorption. This is CALLED
the heel effect.
some of the electrons bounce off the focal spot and then land on other areas of the target, causing x-rays to be produced from outside of the focal spot THIS IS CALLED
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