RGT 2911 Ch 9

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Author:
ethinsmom
ID:
192182
Filename:
RGT 2911 Ch 9
Updated:
2013-01-10 22:13:10
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Radiation Biology
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Description:
Radiation Biology Chapter 9
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  1. Each time an x-ray photon scatters, its intensity at 1 meter from the scattering object is what fraction of its original intensity?

    A. 1/10
    B. 1/100
    C. 1/500
    D. 1/1000
    D
  2. If an individual received 45 mR while standing at 4 feet from a source of radiation for 2 minutes, which of the options listed below will most effectively reduce his or her radiation exposure?

    A. Standing 6 feet from the source for 2 minutes
    B. Standing 5 feet from the source for 1 minute
    C. Standing 4 feet from the source for 3 minutes
    D. Standing 3 feet from the source for 2 minutes
    B
  3. How much protection is provided from a 100 kV x-ray beam when using a 0.50 mm lead equivalent apron?

    A. 65%
    B. 75%
    C. 88%
    D. 99%
    B
  4. Radiation dose to personnel is reduced by the following exposure cord guidelines:
    1. Exposure cords on mobile equipment must allow the operator to be at least 6 feet from the x-ray tube
    2. Exposure cords on fixed equipment must allow the operator to be at least 6 feet from the x-ray tube
    3. Exposure cords on fixed and mobile equipment should be the coiled and expandable type

    A. 1 only
    B. 1 & 2
    C. 2 & 3
    D. All 3
    A
  5. Which of the following groups of exposure factors will deliver the least exposure to the patient?

    A. 5 mAs, 90 kV
    B. 10 mAs, 80 kV
    C. 20 mAs, 68 kV
    D. 40 mAs, 66 kV
    A
  6. Some patients, such as infants and children, are unable to stay in the necessary radiographic position and require assistance.  If mechanical restraining devices cannot be used, who of the following is best suited to hold these patients?

    A. Floor nurse
    B. Transporter
    C. Friend or relative
    D. Student-radiographer
    C
  7. Guidelines used to reduce personnel and/or patient dose in fluoroscopy include:
    1. Maximum tabletop intensity of 10 R/min
    2. Maximum SSD of 12 inches
    3. Minimum filtration 2.5 mm Al equivalent

    A. 1 only
    B. 1 & 2
    C. 1 & 3
    D. All 3
    C
  8. Features of fluoroscopic equipment designed especially to eliminate unnecessary radiation to the patient and personnel include:
    1. Protective curtain
    2. Filtration
    3. Collimation

    A. 1 only
    B. 1 & 2
    C. 1 & 3
    D. All 3
    D
  9. Primary radiation barriers must be at least how high?

    A. 5 feet
    B. 6 feet
    C. 7 feet
    D. 8 feet
    C
  10. The protective control booth from which the radiographer makes the x-ray exposure is a:

    A. Primary barrier
    B. Secondary barrier
    C. Useful beam barrier
    D. Remnant radiation barrier
    B

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