27 Questions
Which type of machine is used in external beam radiotherapy?
Teletherapy machine
What is the most widely used radionuclide in teletherapy sources?
60Co
What is an important factor to consider when selecting a suitable source for teletherapy devices?
Half-life of the source
What is the primary purpose of considering the specific activity of a teletherapy source?
To determine the potency of the source
What is the result of the decay of a teletherapy source into a more stable daughter nucleus?
Decreased radiation intensity
Why is photon energy an important consideration in teletherapy sources?
It affects the penetration of the radiation
What is the primary requirement for particle acceleration?
A charged particle
Which type of accelerator is commonly used in medicine?
Linear accelerator
What is the purpose of accelerating electrons in a LINAC?
To create a beam for radiation therapy
What is a characteristic of electrostatic accelerators?
They provide a constant electric field
Which of the following is an example of a cyclic accelerator?
Linear accelerator
What is the energy range of electrons accelerated in a LINAC?
From 4 to 25 MeV
In which type of structure do electrons accelerate in a LINAC?
Accelerating waveguide
What is a characteristic of cyclic accelerators?
They use a magnetic field
Which of the following is NOT an example of a cyclic accelerator?
Orthovoltage X-ray tube
What is a requirement for the accelerating electric field?
It must be in the direction of particle acceleration
Which type of accelerator is used in basic research for nuclear and high-energy physics?
Multiple types of accelerators
What is a crucial consideration when selecting a radionuclide for teletherapy?
Specific activity and decay into a stable daughter nucleus
What type of machines are used in external beam radiotherapy?
Teletherapy machines
What is the most widely used radionuclide in teletherapy sources?
60Co
What is an important consideration in the selection of a teletherapy source?
Half-life
What is the purpose of considering the decay of a teletherapy source into a more stable daughter nucleus?
To determine the stability of the source
Which of the following is NOT a consideration when selecting a teletherapy source?
Machine size
What is the primary purpose of considering the photon energy of a teletherapy source?
To determine the suitability of the source for treatment
What is an important consideration in the operation of teletherapy machines?
Radiation protection
What is a characteristic of teletherapy machines?
They incorporate gamma ray sources
What is an important factor to consider when selecting a teletherapy source?
Specific activity
Learn about the properties and characteristics of teletherapy sources, including their radioactive decay, half-life, and emission of electrons and gamma rays. Understand the energy levels and therapy beams involved.
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