Radiation Protection 2

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Author:
Anonymous
ID:
302824
Filename:
Radiation Protection 2
Updated:
2015-05-16 22:35:57
Tags:
rad
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Description:
Minimizing patient exposure
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  1. The focal spot-to-table distance in mobile fluoroscopy must




     
    be at least 15 inches. 



     
    not exceed 15 inches. 



     
    be at least 12 inches. 



     
    not exceed 12 inches.
    •  
    •  
    • be at least 12 inches
  2. Which of the following is (are) characteristic(s) of a 16:1 grid?

    1. It absorbs more useful radiation than an 8:1 grid.

    2. It has more centering latitude than an 8:1 grid.

    3. It is used with higher-kilovoltage exposures than an 8:1 grid.






     
    1 only 



     
    1 and 3 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 3 only
  3. Filtration is added to the x-ray beam to




     
    decrease photoelectric interaction. 



     
    remove the "hard" x-rays. 



     
    produce a more heterogeneous x-ray beam. 



     
    produce an x-ray beam with higher average energy.
    •  
    •  
    • produce an x-ray beam with higher average energy
  4. The reduction in the intensity of an x-ray beam as it passes through material is termed




     
    absorption 



     
    scattering 



     
    attenuation 



     
    divergence
    •  
    •  
    • attenuation
  5. Which of the following tissues is (are) considered to be particularly radiosensitive?

    1. Intestinal mucous membrane

    2. Epidermis of extremities

    3. Optic nerves






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    1
  6. Which of the following statements is (are) true with respect to radiation safety in fluoroscopy?

    1. Tabletop radiation intensity must not exceed 2.1 R/min/mA.

    2. Tabletop radiation intensity must not exceed 10 R/min.

    3. In high-level fluoroscopy, tabletop intensity up to 20 R/min is permitted.






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  7. Which of the following interactions between x-ray photons and matter involves a high-energy photon and the ejection of an outer shell electron?
    •  
    • Compton scatter
  8. Replacing 200-speed intensifying screens with 400-speed screens will

    1. require the exposure to be cut in half.

    2. enable the radiographer to decrease the exposure time.

    3. increase the production of scattered radiation.






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  9. The reduction in x-ray photon intensity as the photon passes through a material is termed




     
    absorption. 



     
    scattering. 



     
    attenuation. 



     
    divergence.
    •  
    •  
    • attenuation.
  10. Which of the dose–response curves shown in Figure 3–7 is representative of radiation-induced skin erythema?

    1. Dose–response curve A

    2. Dose–response curve B

    3. Dose–response curve C










     
    1 only 



     
    1 and 2 only 



     
    3 only 



     
    2 and 3 only
    •  
    •  
    • 3 only
  11. To radiograph an infant for suspected free air within the abdominal cavity, which of the following projections of the abdomen will demonstrate the condition with the least patient exposure?




     
    PA erect with grid 



     
    Left lateral decubitus with grid 



     
    Left lateral decubitus without grid 



     
    Recumbent AP without grid
    •  
    •  
    • Left lateral decubitus without gri

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