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Protective Housing
Glass Envelope
Filament
Focusing Cup
Anode
100
When x-rays are produced, they are emitted _______, that is, in all directions.
What is isotropically
100
The structure containing the main components of an x-ray tube, cathode and anode.
What is the glass envelope
100
A coil of wire usually made of thoriated tungsten.
What is a filament
100
A metal shroud surrounding the filament.
What is a focusing cup
100
The positive side of the x-ray tube.
What is the anode
200
The x-rays emitted through the window.
What is the useful beam
200
Allows the tube to have more efficient x-ray production and a longer tube life.
What is a vacuum tube
200
The process where, once a filament is sufficiently heated, outer shell electrons are boiled and ejected from the filament.
What is thermionic emission
200
The charge given to the focusing cup.
What is negative
200
Typical type of anode used in dental radiography.
What is a stationary anode
300
X-rays that penetrate through the protective housing.
What is leakage radiation
300
This type of tube contained controlled quantities of gas in the glass envelope.
What is Crookes tube
300
Atomic number of tungsten.
What is 74
300
The focusing cup directs the electron beam towards the ______.
What is anode
300
Metal material added to the tungsten anode.
What is rhenium
400
Acts as both an electrical insulator and a thermal cushion in the protective housing around the x-ray tube.
What is oil
400
the width of the x-ray tube window which allows for maximal emission of x-rays.
What is 5cm
400

The most common cause of tube failure.

What is tungsten filament burn out

400
The focusing cup is made out of this material.
What is molybdenum or nickel
400
The typical angle of the anode at an SID of 40 inches.
What is 12 degrees
500
Lines the inside of the protective housing.
What is lead
500
The type of glass used, enabling the tube to withstand tremendous heat.
What is Pyrex glass
500
The addition of this metal to the filament increases efficiency of thermionic emission and prolongs tube life.
What is thorium
500
Determined by its size and shape, its charge, the filament size and shape, and the position of the filament within the focusing cup.
What is the effectiveness of the focusing cup
500
Type of anode used in general x-ray.
What is a rotating anode