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RADT465 Direct Study

Unit 2-Equipment Operation and Quality Control

QuestionAnswer
What type of x-ray tube enclosure maintains a constant electric potential, has a longer life, and is less likely to fail? metal enclosure tube (Bushong, 10th ed., p.107)
This side of the x-ray tube is positive and contains the target. anode (Bushong, 10th ed., p.107)
What is type of metal used to create the filament? thoriated tungsten (Bushong, 10th ed., p.108)
What are the two primary parts of the cathode? filament and focusing cup (Bushong, 10th ed., p.107)
What is a space charge? a cloud of negatively charged electrons around the end of the filament (Bushong, 10th ed., p.109)
What is the inability for anymore electrons to be emitted from the filament due to the electrostatic repulsion of the space charge? space charge effect (Bushong, 10th ed., p.107)
Name the two types of anodes. stationary rotating (Bushong, 10th ed., p.110)
What are the three functions of the anode? electrical conductor mechanical support for the target thermal dissipater (Bushong, 10th ed., p.110)
What are the three metals that make up a rotating anode disk? copper molybdenum graphite (Bushong, 10th ed., p.110)
What is the area on the anode hit by the electrons form the cathode? target (Bushong, 10th ed., p.111)
List the three reasons tungsten is used as the metal for the target? high atomic number dissipates heat very well high melting point (Bushong, 10th ed., p.111)
How is a rotating anode powered? an electromagnetic induction motor (Bushong, 10th ed., p.113)
Enclosed inside the x-ray tube, this shaft is made of bars of copper and soft iron turned into one mass. rotor (Bushong, 10th ed., p.113)
Outside of the x-ray, consists of electromagnets equally spaced around the neck of the tube. stator (Bushong, 10th ed., p.113)
What do the manufacturers of x-ray tubes provide to aid the radiographer in selecting exposure levels to maximize x-ray tube life? tube rating charts (Bushong, 10th ed., p.119)
What causes arching in the x-ray tube? vaporization of the filament (Bushong, 10th ed., p.118)
List the three ways heat can be dissipated? radiation conduction convection (Bushong, 10th ed., p.117)
What inhibits the flow of electrons in a circuit? Resistor (Bushong,10th ed. p.67)
Provides electric potential. battery (Bushong, 10th ed., p.67)
Increases or decreases voltage by fixed amount. transformer (Bushong, 10th ed., p.67)
Allows electrons to flow in only one direction. diode (Bushong, 10th ed., p.67)
_______ _____ is total x-ray absorption. photoelectric effect (Bushong, 10th ed., p.151)
Differential absorption _______ as kVp is reduced. increases (Bushong, 10th ed., p.155)
The total reduction in the number of x-rays in a beam after penetration. attenuation (Bushong, 10th ed., p.159)
Name the two types of x-ray interactions important in diagnostic radiology. Compton scattering, photoelectric effect (Bushong, 10th ed., p. 148)
This type of interaction occurs with the outer-shell electrons causing the energy to be reduced and ionizes the atom (ejects electron from the atom). Compton scattering (Bushong, 10th ed., p.148)
This type of interaction of x-rays in the diagnostic range causes ionization of the atom by interactions with inner-shell electrons and the x-ray is totally absorbed. Photoelectric effect (Bushong, 10th ed., p.150)
When is photoelectric effect most likely to occur? x-ray energy increased, atomic number is increased, and mass density is increased (Bushong, 10th ed., p.153)
What is the melting point of tungsten? 3410 degrees C (Bushong, 10th ed., p.108)
What is the actual x-ray source? focal spot Bushong, 10th ed., p.113)
What is the negative side of the x-ray tube? cathode Bushong, 10th ed., p.107)
This allows for higher tube currents and shorter exposure times? rotating anode Bushong, 10th ed., p.112)
Created by: lawebster