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X-ray Tube
Radiation Interactions
Anode and Cathode
Electric Control
100
This surrounds the basic structure of the x-ray tube.
What is the Pyrex glass envelope? p. 55
100
This interaction is created when an incoming electron slows near the nucleus of an atom and abruptly changes direction.
What is Bremsstrahlung Radiation? p. 56
100
These contain two filaments: one large and one small; and only one is used at a time.
What are dual-focus tubes? p. 57
100
The penetrating power of the x-ray beam is controlled by varying this.
What is kVp? p. 61
200
The source of the electrons is provided by this, located at one end of the tube.
What is the filament? p. 55
200
This shell fills the hole created by an incoming electron in Characteristic Radiation.
What is the L-shell? p. 57
200
Filaments are situated in a hollow area in the cathode called this.
What is a focusing cup? p. 57
200
kVp controls this in the radiographic image.
What is contrast? p. 61
300
This process refers to electrons in the outermost shells of a nucleus moving from orbit and forming an "electron cloud."
What is thermionic emission? p. 55
300
An x-ray beam is said to be this when it is made of many different wavelengths.
What is heterogenous? p. 56
300
A negative charge from the cathode end of the tube cause the electrons to be repelled in the direction of this very precise area on the target.
What is the focal spot? p. 57
300
This is the measure of the rate of current flow across the x-ray tube.
What is mAs? p. 62
400
These are the four essential requirements for the production of x-rays?
What is a vacuum, source of electrons, a target, and high potential difference (voltage)? p. 55
400
X-ray energy is measured in these.
What is kiloelectron volts (keV)?
400
Modern tubes contain this type of anode which is in the form of a disk, with a beveled-edge target.
What is a rotating anode? p. 58
400
The quantity of x-rays produced is directly proportional to this.
What is exposure time? p. 62
500
This supplies the voltage required for x-ray production.
What is a large step-up transformer? p. 55
500
At 100 kVp, characteristic radiation makes up about this percentage of the useful beam.
What is 15%? p. 57
500
This is the slant of the anode surface.
What is the target angle? p. 58
500
This is the actual measure of the electrons that cross the x-ray tube during an exposure.
What is mAs? p. 62