Exam 1 - 2. Radiation Physics Flashcards
4
What are the 5 components of the operator control panel?
5-6
What are the 8 components of the tube head?
7
Is the cathode negative or positive?
7
The cathode end of the X-ray tube has a ____ filament.
7
The cathode end of the X-ray tube is a source of _____.
7
The cathode end of the X-ray tube is heated with a _______ and emits electrons at a rate ________. The term for this is _____.
7
The focusing cup is made of ____.
7
The focusing cup is ____ charged.
7
The focusing cup focuses ____ into a narrow beam directed to the _____, which is ____ charged.
8
Is the anode positive or negative?
8
The tungsten target transforms the _____ into _____.
8
The tungsten target is highly _____. It produces ____% heat and ____% X-rays.
8
The copper stem of the anode end of the x-ray tube works as a ______ to ________ to avoid ____.
9
What are four reasons why tungsten is selected as the target?
9
What effect does high atomic number have on x-ray production?
9
What effect does high melting point have as a target?
9
Tungsten has a high thermal conductivity to ______.
9
Tungsten has a low vapor pressure, which helps to ______l
10
What are the four conditions necessary for X-ray production?
11
Thermionic emission: production of an electron cloud:
Low voltage filament current heats the tungsten filament to ______ with resultant _________ from the tungsten atom. This is called ____.
12
Acceleration of electrons to a high speed:
High potential difference is produced between the _____ and the ____ by applying a _____ between them. A ______ is used. Electrons are accelerated to a _____.
13
Concentration/Focusing of electrons:
Electron beam is focued by the _____ and directed toward the _____.
14
Sudden stoppage of electron stream to produce x-rays:
Upon striking the focal spot in the anode, the electron stream is ____, and _____ of the electron stream undergoes conversion to ______ and ______. The copper stem removes the ____ from the tungsten.
16
The focal spot is the area on the target to which the ______ directs the _____ and from which the ______.
16
The size of the focal spot is important for ______. A smaller focal spot results in ________.
16
What is the disadvantage to a smaller focal spot?
16
What are the two ways to overcome the disadvantage of more heat accumulating with a smaller focal spot?
17
The rotating anode allows ___________. It is used in _____.
18
What is the line focus principle (Stationary anode)?
18
The line focus principle results in ______ while maintaining _______.
19
The actual focal spot is the ________.
19
The effective focal spot is the _____.
19
What is the relationship between the effective focal spot and the actual focal spot?
20
What are the 2 principal functions of the power supply?
21
What is the transformer?
22
What are the 3 types of transformers in the x ray unit?
23
The step-down transformer is used to convert _____ volts to ____ volts to _____.
23
The step-down transformer is regulated by the _____.
23
With the step-down transformer, increasing the _____ will increase the number of ______.
23
The step-up transformer is used to convert ____ volts to ____ volts to move the electrons ______.
23
The step-up transformer is regulated by the _____.
23
With the step-up transformer, increasing the ____ will increase the _______ traveling from the _____.
24
What does exposure time determine?
24
What is the time delay circuit?
24
What is the timing circuit?
25
What doees kV control?
25
What does mA control?
25
What does exposure time control?
