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

What is the primary requirement for particle acceleration?

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

Which type of accelerator is commonly used in medicine?

<p>Linear accelerator (B)</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 (C)</p> Signup and view all the answers

What is a characteristic of electrostatic accelerators?

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

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

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

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

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

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

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

What is a characteristic of cyclic accelerators?

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

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

<p>Orthovoltage X-ray tube (D)</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 (A)</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 (C)</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 (D)</p> Signup and view all the answers

What type of machines are used in external beam radiotherapy?

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

What is the most widely used radionuclide in teletherapy sources?

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

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

<p>Half-life (B)</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 (A)</p> Signup and view all the answers

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

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

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

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

What is a characteristic of teletherapy machines?

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

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

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

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