RADIOLOGY LECTURE 3 ~~~
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Questions and Answers

What type of effect occurs when an X-ray photon interacts with an inner shell electron and becomes absorbed?

  • Photoelectric effect (correct)
  • Photoionization
  • Compton scatter
  • Bremsstrahlung effect
  • Which macromolecule is least likely to be directly ionized by X-ray photons?

  • Lipids (correct)
  • Proteins
  • DNA
  • RNA
  • What effect does higher atomic number have on the likelihood of the photoelectric effect occurring?

  • It decreases the likelihood of absorption.
  • It causes total reflection of X-rays.
  • It has no effect on absorption.
  • It increases the likelihood of absorption. (correct)
  • In the process of indirect ionization from X-rays, which component is primarily responsible for causing damage to DNA?

    <p>Free radicals generated from water decomposition</p> Signup and view all the answers

    Which outcome of an X-ray indicates that no absorption took place?

    <p>Pure scatter</p> Signup and view all the answers

    What is the primary reason the photoelectric effect is preferred during X-ray imaging?

    <p>It produces a whiter/more opaque image.</p> Signup and view all the answers

    What type of damage can occur in DNA due to direct ionization from X-rays?

    <p>Point mutations</p> Signup and view all the answers

    What occurs during the Compton effect when an X-ray interacts with matter?

    <p>The X-ray is deflected and part of its energy is lost.</p> Signup and view all the answers

    What happens to the photon during the Compton effect?

    <p>It can undergo further collisions or be deflected.</p> Signup and view all the answers

    In the Compton effect, what happens to the energy of the photon after the collision?

    <p>Some energy is lost, but it remains active.</p> Signup and view all the answers

    What type of atom is created in the Compton effect after the photon interacts?

    <p>An unstable atom with a vacancy in the outer orbit.</p> Signup and view all the answers

    Which effect is preferred in X-ray imaging and why?

    <p>The photoelectric effect; it results in fewer X-rays reaching the detector.</p> Signup and view all the answers

    What are the consequences of deterministic effects from radiation exposure?

    <p>They lead to observable effects that are dose-dependent.</p> Signup and view all the answers

    What is the risk of stochastic effects in dental diagnostics?

    <p>It is low due to the very low doses used.</p> Signup and view all the answers

    What might occur as a result of a point mutation at the chromosomal level?

    <p>Potential for cell death or abnormal replication.</p> Signup and view all the answers

    What differentiates the ejected electron in the Compton effect from that in the photoelectric effect?

    <p>It has higher energy in the Compton effect.</p> Signup and view all the answers

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