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RADT465 Direct Study
Unit 2-Equipment Operation and Quality Control
| Question | Answer |
|---|---|
| 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
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