Radiotherapy
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Questions and Answers

Which type of machine is used in external beam radiotherapy?

  • Brachytherapy machine
  • Intensity-modulated machine
  • Teletherapy machine (correct)
  • Stereotactic machine
  • What is the most widely used radionuclide in teletherapy sources?

  • 137Cs
  • 192Ir
  • 60Co (correct)
  • 241Am
  • What is an important factor to consider when selecting a suitable source for teletherapy devices?

  • Weight of the source
  • Half-life of the source (correct)
  • Cost of the source
  • Size of the source
  • What is the primary purpose of considering the specific activity of a teletherapy source?

    <p>To determine the potency of the source</p> Signup and view all the answers

    What is the result of the decay of a teletherapy source into a more stable daughter nucleus?

    <p>Decreased radiation intensity</p> Signup and view all the answers

    Why is photon energy an important consideration in teletherapy sources?

    <p>It affects the penetration of the radiation</p> Signup and view all the answers

    What is the primary requirement for particle acceleration?

    <p>A charged particle</p> Signup and view all the answers

    Which type of accelerator is commonly used in medicine?

    <p>Linear accelerator</p> Signup and view all the answers

    What is the purpose of accelerating electrons in a LINAC?

    <p>To create a beam for radiation therapy</p> Signup and view all the answers

    What is a characteristic of electrostatic accelerators?

    <p>They provide a constant electric field</p> Signup and view all the answers

    Which of the following is an example of a cyclic accelerator?

    <p>Linear accelerator</p> Signup and view all the answers

    What is the energy range of electrons accelerated in a LINAC?

    <p>From 4 to 25 MeV</p> Signup and view all the answers

    In which type of structure do electrons accelerate in a LINAC?

    <p>Accelerating waveguide</p> Signup and view all the answers

    What is a characteristic of cyclic accelerators?

    <p>They use a magnetic field</p> Signup and view all the answers

    Which of the following is NOT an example of a cyclic accelerator?

    <p>Orthovoltage X-ray tube</p> Signup and view all the answers

    What is a requirement for the accelerating electric field?

    <p>It must be in the direction of particle acceleration</p> Signup and view all the answers

    Which type of accelerator is used in basic research for nuclear and high-energy physics?

    <p>Multiple types of accelerators</p> Signup and view all the answers

    What is a crucial consideration when selecting a radionuclide for teletherapy?

    <p>Specific activity and decay into a stable daughter nucleus</p> Signup and view all the answers

    What type of machines are used in external beam radiotherapy?

    <p>Teletherapy machines</p> Signup and view all the answers

    What is the most widely used radionuclide in teletherapy sources?

    <p>60Co</p> Signup and view all the answers

    What is an important consideration in the selection of a teletherapy source?

    <p>Half-life</p> Signup and view all the answers

    What is the purpose of considering the decay of a teletherapy source into a more stable daughter nucleus?

    <p>To determine the stability of the source</p> Signup and view all the answers

    Which of the following is NOT a consideration when selecting a teletherapy source?

    <p>Machine size</p> Signup and view all the answers

    What is the primary purpose of considering the photon energy of a teletherapy source?

    <p>To determine the suitability of the source for treatment</p> Signup and view all the answers

    What is an important consideration in the operation of teletherapy machines?

    <p>Radiation protection</p> Signup and view all the answers

    What is a characteristic of teletherapy machines?

    <p>They incorporate gamma ray sources</p> Signup and view all the answers

    What is an important factor to consider when selecting a teletherapy source?

    <p>Specific activity</p> Signup and view all the answers

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