RGT 2911 Ch 7

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RGT 2911 Ch 7
2013-01-10 22:10:55
Radiation Biology

Radiation Biology Chapter 7
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  1. The type of dose-response curve used to predict stochastic effects is the:

    A. Nonlinear nonthreshold
    B. Nonlinear threshold
    C. Linear nonthreshold
    D. Linear threshold
  2. A dose of 0.25 Gy or 25 rad to the fetus during the 3rd or 4th week of pregnancy is more likely to cause which of the following?

    A. Spontaneous abortion
    B. Skeletal anomalies
    C. Neurologic anomalies
    D. Organogenesis
  3. Linear energy transfer (LET) is:
    1. A method of expressing radiation quality
    2. A measure of the rate at which radiation energy is transferred to soft tissue
    3. Absorption of polyenergetic radiation

    A. 1 only
    B. 1 & 2
    C. 1 & 3
    D. All 3
  4. What is the effect on relative biologic effectiveness (RBE) as linear energy transfer (LET) decreases?

    A. As LET decreases, RBE increases
    B. As LET decreases, RBE decreases
    C. As LET decreases, RBE stabilizes
    D. LET has no effect on RBE
  5. The effects of radiation to biologic material are dependent on several factors. If a quantity of radiation is delivered to a body over a long period of time, the effect:

    A. will be greater than if it were delivered all at one time.
    B. will be less than if it were delivered all at one time.
    C. has no relation to how it is delivered in time.
    D. is solely dependent on the radiation quality.
  6. Which of the following account(s) for x-ray beam heterogeneity?
    1. Incident electrons interacting with several layers of tungsten target atoms
    2. Electrons moving to fill different shell vacancies
    3. Its nuclear origin

    A. 1 only
    B. 1 & 2
    C. 1 & 3
    D. All 3
  7. What is used to account for the relative radiosensitivity of various tissues and organs:
    1. Tissue weighting factors
    2. Radiation weighting factors
    3. Absorbed dose

    A. 1 only
    B. 1 & 2
    C. 2 & 3
    D. All 3
  8. How are wavelength and energy related?

    A. Directly
    B. Inversely
    C. Chemically
    D. Empirically
  9. The useful x-ray beam can be accurately described as having what sort of nature?

    A. Homogeneous
    B. Heterogeneous
    C. Homologous
    D. Focused
  10. Long-term effects of radiation exposure include:
    1. Formation of cataracts
    2. Cancer
    3. Genetic effects

    A. 1 only
    B. 1 & 2
    C. 2 & 3
    D. All 3