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Chap 5-7 exam
| Question | Answer |
|---|---|
| The shift of the characteristic x ray spectrum to higher energy occurs because of which of the following | an increase in target atomic number |
| If an average radiographic technique is used | most x rays are bremsstrahlung |
| When projectile electron energy is increased | more bremsstrahlung x rays are produced |
| A technique using high kVp (70 or above) would result in _______ compared to a low kVp technique. | decreased absorption by the patient and increased production of scatter radiation |
| During the Compton effect most of the incident x ray energy is given to which of the following | scattered x ray |
| When the kVp is increased, x ray quantity | increases in proportion geometrically |
| What occurs when the small rather than the large cathode coil is energized | smaller effective focal spot |
| When the mAs is increased, x ray quantity | increases proportionately |
| The kinetic energy of a projectile electron can be measured in | volts |
| The amplitude of the bremsstrahlung x ray emission spectrum | has average value at energy approximately one third of the kVp |
| Secondary ionization can occur as the result of | photo-electric effect compton effect |
| X rays are produced when | projectile electrons interact with target atoms |
| Effective compensation for the anode heel effect would involve positioning: | the thinnest portion of the part under the anode |
| Which of the following occurs in a Compton interaction | an atom is ionized |
| The HVL is affected principally by a change in which of the following | kVp |
| The anode heel effect cause the intensity of the x-ray beam to be great at the | cathode end of the beam |
| The photoelectric effect is | the complete absorption of an x ray with the subsequent emission of an electron |
| A technique using high kVp (80 or above) would result in _______ compared to a low kVp technique. | decreased absorption by the patient and increased production of scatter radiation |
| Molybdenum has a lower atomic number than tungsten; therefore, the molybdenum x ray emission spectrum (graph) | has lower amplitude |
| Which of the following does not affect x ray quantity | radioactivity |
| The power of x ray exposure is best represented by | the area under the emission spectrum |
| Characteristic x rays | are characteristic of target Z number |
| What is produced when the projectile electron excites an outer shell electron | heat |
| A representative radiographic tube has 0.5 mm Al inherent filtration and 2.0 mm Al added filtration. Therefore: | an additional 1.0 mm Al filtration will harden the x ray beam |
| Which of the following is not one of the five basic x ray interactions with matter | bremsstrahlung |
| The continuous x ray emission spectrum principally depends on which of the following | projectile electron energy |
| If radiographic technique in a tungsten target at 60 kVp/80 mAs is changed to 80 kVp/80 mAs | the number of x rays produced increases |
| Compton effect is most common in what kVp ranges? | 70 or higher kvp |
| An increase in mAs will increase | x ray quantity |
| Both the shape and the position of the characteristic x ray emission spectrum | correspond to target electron binding energies |
| Useful characteristic x rays are produced in tungsten | by removal of a K shell electron |
| The output intensity of an x ray tube | is primarily due to bremsstrahlung x rays |
| The energy of characteristic x rays increases with increasing | atomic number of target material |
| Differential absorption | is the difference between absorbed and transmitted x-rays |
| The inherent filtration in a general purpose radiographic x ray tube is usually equivalent to | 0.5 mm Al |
| Minimum wavelength of a photon is related to | the kinetic energy of the projectile electron |
| Which of the following statements applies to the x ray emission spectrum | the target material affects the amplitude of bremsstrahlung x rays |
| When filtration is added to an x ray tube, which of the following increases | radiation quality |
| An increase in kVp results in an increase in | radiation quality |
| Anatomic structures that readily (easily) transmit x rays are | radiolucent |
| When distance is increased, x ray quantity at that distance | decreases in proportion to distance squared |
| The kinetic energy of the projectile electron in an x-ray tube | is about 1% efficient in the production of x-rays |
| The quality of an x ray beam is principally a function of which of the following | kVp |
| In a tungsten x ray tube operated at 90 kVp, the most abundant x ray would be a | 30 keV bremsstrahlung x ray |
| _____ is the phenomenon that occurs around the filament during thermionic emission and prevents the further escape of electrons from the filament. | Space charge effect |
| Another meaning of x ray quantity is x ray | intensity |
| Which characteristic is reduced as x ray energy increases | x ray wavelength |
| When filtration is added to a normally filtered x ray beam, the x ray emission spectrum will | decrease in amplitude |
| Bremsstrahlung radiation is produced by | conversion of incident electron kinetic energy to electromagnetic energy |
| When characteristic x rays are produced the energy of the x rays is characteristic of | the atomic number of the target |
Created by:
DeAndreMitchell
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