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source of electrons, target, high-voltage, and vacuum
What are the 4 things needed to produce x-rays?
high melting point and difficult to vaporize
What are the two main reasons tungsten is selected as the filament material?
rhenium and molybdenum
What are two other good choices, besides tungsten, for the filament material?
What is the term used to describe the type of x-ray tubes that have two focal spots, one large and the other small, as well as two filaments, one large and the other small.
What is the process of electrons being released from the filament as it is heated called?
What is the name of the tube failure where vaporized tungsten is collected on the envelope?
space charge effect
The negatively charged focusing cub compresses the thermionic cloud. This process is known as what?
biased focusing cup
A ___ ____ ____ maintains the focusing cup at a more negative voltage than the filament (used in mammography).
What is the filament phenomenon that has been achieved when there are no further thermionic electrons to be driven toward the anode?
target surface, conducts high voltage, and primary thermal conductor
What are the three functions of the anode assembly?
Rotating anodes are composed of _______ ____ because it has a high z#, melting point, and heat-conducting ability.
pyrex glass or metal
What is the envelop made out of that is ease to mold and easy for x-rays to pass through?
What surrounds the envelope and is used to insulate, promote cooling, and is sometimes circulated trhough a heat exchanger?
tube rating chart
What chart or graph is used to determine how much heat or exposure a tube can take?
anode cooling curves
What chart or graph is used to determine how long to wait until another exposure can be taken?
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