Test Bank For Radiographic Imaging and Exposure 6th Edition by Fauber Test Bank Answers

Chapter 02: The X-ray Beam Fauber: Radiographic Imaging and Exposure, 6th Edition MULTIPLE CHOICE 1. The is the portion of the x-ray tube that contains the filament. a. cathode b. anode c. rotor d. rotating disk ANS: A The filament, the source of electrons during x-ray production, is located in the cathode. 2. The cathode filament is made of: a. tungsten. b. rhenium. c. molybdenum. d. lead. e. nickel. ANS: A The cathode filament is made of tungsten. 3. The focusing cup: a. surrounds the anode. b. has a positive charge. c. has a negative charge. d. focuses the x-ray beam. ANS: C The focusing cup, surrounding the filament on three sides, has a negative charge, keeping the negatively charged electrons focused. 4. In a dual-focus tube, how many filaments are energized at any one-time during x-ray production? a. One b. Two c. Four d. An infinite number ANS: A Only one filament is energized at any one-time during x-ray production. 5. The focusing cup is made of: a. tungsten. b. rhenium. c. molybdenum. d. lead. e. nickel. TESTBANKBLUE #1 NURSING TEST BANK WEBSITE 15/6/23, 1:11 Test Bank for Radiographic Imaging and Exposure 6th Edition by Fauber 97803… about:blank 2/15 Test Bank For Radiographic Imaging and Exposure 6th Edition by Fauber Test Bank Click Here To Access The FULL VERSION ANS: E The focusing cup is made of nickel. 6. is the phenomenon that occurs around the filament during thermionic emission and prevents the further escape of electrons from the filament. a. Saturation current b. Space charge effect c. mA rectification d. Line focus principle ANS: B The space charge effect limits the number of electrons in the space charge by preventing additional electrons from being boiled off the filament. 7. The positive side of the x-ray tube is the: a. anode. b. cathode. c. window. d. stream of electrons. ANS: A The anode is the positive side of the x-ray tube, and the cathode is the negative. 8. The maximum speed the rotating anode will typically achieve is rpm. a. 3200 b. 5000 c. 10,000 d. 20,000 ANS: C Rotating anodes rotate at a set speed ranging from 3000 to 10,000 revolutions per minute (rpm). 9. What is the base material of the anode disk? a. Tungsten and molybdenum b. Tungsten and graphite c. Molybdenum and graphite d. All options are correct. ANS: C The base of the rotating anode disk is made of molybdenum with a graphite layer. 10. What is the name of the fixed physical area on the anode target that is struck by the electron stream? a. Focal spot b. Focal point c. Focal range d. Focal radius ANS: A The focal spot is the fixed physical area on the focal track of the anode target where electrons strike. T ESTBANKBLUE #1 NURSING TEST BANK WEBSITE 15/6/23, 1:11 Test Bank for Radiographic Imaging and Exposure 6th Edition by Fauber 97803… about:blank 3/15 Test Bank For Radiographic Imaging and Exposure 6th Edition by Fauber Test Bank Click Here To Access The FULL VERSION 11. What is the name of the device in a rotating anode x-ray tube that turns the rotor? a. Stator b. Rotor c. Focusing cup d. Rheostat ANS: A Located outside the envelope of the x-ray tube, the stator is an electric motor that turns the rotor. 12. Effective compensation for the anode heel effect would involve positioning: a. the thinnest portion of the part under the anode and the thickest portion of the part under the cathode b. the thinnest portion of the part under the anode and the thinnest portion of the part under the cathode c. the thickest portion of the part under the cathode and the thickest portion of the part under the anode d. the thinnest portion of the part under the cathode and the thickest portion of the part under the anode ANS: A The thinnest portion of a part should be placed under the anode, because the more intense x-rays are emitted toward the cathode end of the tube, where the thickest part should be placed. 13. What is an acceptable level of leakage from the tube housing? a. 100 mGya per hour, measured 6 feet away b. 10 mGya per hour, measured 1 foot away c. 10 Gy per hour, measured at a distance of 4 meters d. 1 mGya per hour, measured at a distance of 1 meter ANS: D The maximum amount of leakage radiation from an x-ray tube is 100 mR (1 mGya) per hour when measured at a distance of 1 meter. 14. Which of the following could be defined as the production of an x-ray photon by the electrostatic attraction between the incident electron and the nucleus of the tungsten atom? a. Photoelectric interaction b. Bremsstrahlung interaction c. Characteristic interaction d. Pair production interaction ANS: B Production of an x-ray photon as a result of a slowing down of the incoming electron due to the electrostatic force of the nucleus is due to a bremsstrahlung interaction. 15. If a projectile electron enters an atom with 100 keV of energy, passes very close to the nucleus, and exits with 30 keV of energy. The x-ray photon produced is: a. 13.3 keV b. 70 keV c. 130 keV TESTBANKBLUE #1 NURSING TEST BANK WEBSITE 15/6/23, 1:11 Test Bank for Radiographic Imaging and Exposure 6th Edition by Fauber 97803… about:blank 4/15 Test Bank For Radiographic Imaging and Exposure 6th Edition by Fauber Test Bank Click Here To Access The FULL VERSION d. 30 meV ANS: B If a projectile electron enters an atom with 100 keV of energy, passes very close to the nucleus, and exits with 30 keV of energy. The x-ray photon produced is 70 keV (100 – 30 = 70): 16. Which of the following could be defined as the production of an x-ray photon by a collision between the incident electron and a K-shell electron of the tungsten atom? a. Photoelectric interaction b. Bremsstrahlung interaction c. Characteristic interaction d. Pair production interaction ANS: C Characteristic interactions involve the incident electron colliding with a K-shell electron and ejecting it from orbit. X-rays are produced as a result. 17. A projectile electron removes a K-shell electron and an M-shell electron fills the vacancy. The energy of the K-shell characteristic x-ray photon produced is: a. 57.4 keV b. 66.7 keV c. 72.3 keV d. 81.6 keV ANS: B The energy of the K-shell characteristic x-ray photon produced is 66.7 keV (69.5 – 2.82 = 66.7). 18. is the boiling off of electrons from the filament when current is applied. a. Saturation emission b. Thermionic emission c. Filament transport d. Proton emission ANS: B Thermionic emission is the emission of electrons (ion) as a result of heat (therm). The heating of the filament is due to the application of current. 19. The actual flow of electrons from cathode to anode within the x-ray tube is known as: a. tube current. b. filament current. c. anode current. d. potential difference. ANS: A The tube current is the flow of electrons from cathode to anode within the tube. 20. mA is a measure of that flows from cathode to anode. a. filament current b. tube current c. space charge TESTBANKBLUE #1 NURSING TES