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Radioactive Decay: Alpha and Beta Decay
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Radioactive Decay: Alpha and Beta Decay

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Questions and Answers

What is the primary reason for desiring fast radioactive decay in radiopharmaceuticals?

  • To increase the total patient exposure.
  • To localize the radiopharmaceutical at the target site.
  • To extend the examination time.
  • To reduce the total patient exposure. (correct)

    • What percentage of initially administered 18F is left after 12 hours?

  • 25%
  • 1.6% (correct)
  • 0.5%
  • 50%

    • Why is the fraction of 18F remaining even lower than expected after 12 hours?

  • Due to the emission of gamma rays.
  • Due to the presence of a stable daughter nucleus.
  • Due to slow radioactive decay.
  • Due to the radiopharmaceutical being excreted through the urine. (correct)

    • What is a desirable characteristic of an ideal radiopharmaceutical?

    <p>A short physical half-life.</p> Signup and view all the answers

    What should be the effective half-life of an ideal radiopharmaceutical?

    <p>Approximately equal to the examination time.</p> Signup and view all the answers

    What type of radiation is desirable in an ideal radiopharmaceutical?

    <p>Pure gamma rays.</p> Signup and view all the answers

    What should be the energy of the gamma rays emitted by an ideal radiopharmaceutical?

    <p>Mono-energetic.</p> Signup and view all the answers

    What should be the site of localization for an ideal radiopharmaceutical?

    <p>The target site.</p> Signup and view all the answers

    What is the advantage of the Cyclone-30 isotope-producing cyclotron?

    <p>It is power-efficient.</p> Signup and view all the answers

    What happens to the atomic number of a nucleus when it emits a gamma ray?

    <p>It remains the same.</p> Signup and view all the answers

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