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RADT 456
Equip. Operation & Quality Control
| Question | Answer |
|---|---|
| Two types of diagnostic x-rays? | Bremsstrahlung (70-90%) and Characteristic (10-30%) |
| The distance between two consecutive wave crest. | Wavelength |
| More energetic radiations have _____ wavelength and _____ frequency. | shorter & higher |
| The gradual decrease in exposure rate as radiation passes through tissues is called _____. | Attenuation |
| A relatively low-energy x-ray photon uses all its energy to eject an inner shell electron. | Photoelectric Effect |
| A failry high-energy x-ray photon ejects an outer shell electron. | Compton Scatter |
| Occurs with very low-energy x-ray photons--energies rarely used in diagnostic radiology. | Coherent Scatter |
| Electrical current flowing through a conductor in only one direction and with constant magnitude is called _____. | Direct Current (DC) example: battery |
| _____ is characterized by varying amplitude and periodic reversal of polarity. | (AC) |
| Change mechanical energy to electrical energy. | Generators |
| Change electrical energy to mechanical energy. | Motors |
| X-rays are produced when high-speed electrons are suddenly decelerated upon encountering the ______ atoms of the ______. | tungsten & anode |
| Relationship b/w: the turns ratio and the voltage is a ____ one. relationship b/w: the turns ratios and the current is a ____ one. | direct & indirect |
| single phase, full-wave rectification three phase/six pulse three phase/twelve pulse high-frequency | 100% 13% 4% >1% |
| The glass envelope enclosure creates a _____. | Diode |
| An induction motor has two main parts, a _____ and a _____. | stator & rotor |
| ____% of the kinetic energy of the electron stream is converted to x-rays, and the reast of the energy is converted to heat. | .2 |
| The effective focal spot is always ____ than the actual focal spot. | smaller |
| Results from thermionic emission. | Vaporized Tungsten |
| Exposures made exceeding the tube rating create enough excessive heat to produce many small melts over the focal track. | Pitted Anode |
| A single, large, excessive exposure to a cold anode can be severe enough to crack the anode. | Cracked Anode |
| If the tube vacuum begins to deteriorate, air molecules collide with and decelerate the high-speed electrons. | Gassy Tube |
Created by:
ertempel
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