Radioactive Decay Processes
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Questions and Answers

What is the result of a positive beta particle coming to the end of its range in a positron emitter?

  • It is absorbed by the surrounding material
  • It emits a gamma ray
  • It combines with a negative electron (correct)
  • It decays into a neutron

    • What is the energy equivalent to the mass of each electron in a positron emitter?

  • 511 keV (correct)
  • 360 keV
  • 280 keV
  • 250 keV

    • What type of radiation is emitted when a positive electron and a negative electron annihilate each other in a positron emitter?

  • Beta radiation
  • Annihilation radiation (correct)
  • Gamma radiation
  • Alpha radiation

    • What is the process by which a daughter nuclide emits K-characteristic X-rays?

    <p>An electron from an outer shell fills the created in the K-shell (C)</p> Signup and view all the answers

    What is the energy of the gamma rays emitted by Iodine-131 (131I)?

    <p>364 keV (C)</p> Signup and view all the answers

    What is the decay mode of Iodine-123 (123I)?

    <p>Electron capture (B)</p> Signup and view all the answers

    What is the primary function of the focusing electrode in a photomultiplier tube?

    <p>To direct the photoelectrons towards the first dynode (D)</p> Signup and view all the answers

    What is the outcome of the collision between the primary electrons and the first dynode surface?

    <p>Liberation of more electrons (A)</p> Signup and view all the answers

    What is the purpose of minimizing scattered gamma photons in gamma imaging?

    <p>To reduce image noise (B)</p> Signup and view all the answers

    What is the final destination of the electrons in a photomultiplier tube?

    <p>The anode (A)</p> Signup and view all the answers

    What is the gamma image formed on in a conventional gamma camera?

    <p>A pixelated grid (A)</p> Signup and view all the answers

    What does the formation of a gamma image represent?

    <p>A true mapping of the radioactive agents in the targeted region (B)</p> Signup and view all the answers

    What is the half-life of 99mTc?

    <p>6 hours (C)</p> Signup and view all the answers

    What type of decay occurs in radionuclides with a neutron deficit?

    <p>β+ decay or K-electron capture (D)</p> Signup and view all the answers

    What is the result of β+ decay in radionuclides with a neutron deficit?

    <p>A positron is ejected from the nucleus (D)</p> Signup and view all the answers

    What happens to the atomic number of an atom that undergoes β+ decay?

    <p>It decreases by one (A)</p> Signup and view all the answers

    What is the result of K-electron capture in radionuclides with a neutron deficit?

    <p>The nucleus captures an extranuclear electron (A)</p> Signup and view all the answers

    What is the end product of the decay of 99Tc?

    <p>Ruthenium-99 (99Ru) (C)</p> Signup and view all the answers

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