Biological Effects of X-ray Exposure Quiz
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Questions and Answers

What is the unit of the effective dose of ionizing radiation?

  • Sievert (Sv) (correct)
  • Roentgen equivalent man (rem)
  • Gray (Gy)
  • Becquerel (Bq)
  • What is the primary mechanism by which ionizing radiation causes indirect effects on biological molecules?

  • Increasing the kinetic energy of biological molecules
  • Directly breaking chemical bonds in biological macromolecules
  • Exciting electrons in biological molecules to higher energy states
  • Ionizing water molecules to form free radicals that interact with biological molecules (correct)
  • Which of the following is NOT a tissue weighting factor (WT) used to calculate the effective dose of ionizing radiation?

  • Gonads
  • Bladder
  • Salivary glands
  • Brain (correct)
  • What was the first recorded biological effect of radiation described by Becquerel?

    <p>Skin erythema (redness)</p> Signup and view all the answers

    Which of the following is NOT a potential source of ionizing radiation exposure mentioned in the text?

    <p>Medical imaging procedures</p> Signup and view all the answers

    What is the primary mechanism by which ionizing radiation causes direct effects on biological molecules?

    <p>Directly breaking chemical bonds in biological macromolecules</p> Signup and view all the answers

    Which type of effects caused by x-rays do not have a threshold for expression?

    <p>Cancer</p> Signup and view all the answers

    What is the primary reason for about 2/3 of the biological damage caused by x-rays?

    <p>Indirect action via radiolysis of water</p> Signup and view all the answers

    Which process leads to the formation of hydrogen and hydroxyl free radicals during x-ray exposure in the human body?

    <p>Radiolysis of water</p> Signup and view all the answers

    What percentage of the biologic effects of x-ray exposure result from indirect effects?

    <p>2/3</p> Signup and view all the answers

    Which type of effects demonstrate a threshold for expression due to radiation dose/dose rate?

    <p>Genetic defects</p> Signup and view all the answers

    What is the term used to describe sublethal damage to individual cells that results in cancer formation or heritable mutation?

    <p>Gene mutation</p> Signup and view all the answers

    Which of the following is an example of a deterministic effect of radiation?

    <p>Xerostomia</p> Signup and view all the answers

    What principle emphasizes minimizing exposure to ionizing radiation in dental procedures?

    <p>ALARA Principle</p> Signup and view all the answers

    In the context of radiation safety, what does ALARA stand for?

    <p>As Low As Reasonably Achievable</p> Signup and view all the answers

    What effect does the replication of mutated cells following DNA damage typically lead to?

    <p>Heritable disorders</p> Signup and view all the answers

    Which of the following is an example of an indirect effect of radiation exposure on oral tissues?

    <p>Teeth Caries</p> Signup and view all the answers

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