Podcast
Questions and Answers
Who is credited with the invention of the cobalt-60 teletherapy machine?
Who is credited with the invention of the cobalt-60 teletherapy machine?
- Harald E. Johns (correct)
- Albert Einstein
- Enrico Fermi
- Marie Curie
What is the reason for replacing the source in a cobalt-60 machine every five years?
What is the reason for replacing the source in a cobalt-60 machine every five years?
- To reduce the machine's weight
- To change the type of radiation produced
- To improve the machine's efficiency
- Due to the decay of the source by approximately 1% per month (correct)
Why are cobalt-60 machines still used in developing countries?
Why are cobalt-60 machines still used in developing countries?
- They are more expensive than modern machines
- They have a simpler design and lower cost (correct)
- They produce higher energy radiation
- They require advanced technical support
What is the purpose of the gantry in a modern cobalt therapy machine?
What is the purpose of the gantry in a modern cobalt therapy machine?
What is the process by which cobalt-60 is produced?
What is the process by which cobalt-60 is produced?
What is the primary reason for exact and reproducible selection of tube potential and current in therapeutic use of X-rays?
What is the primary reason for exact and reproducible selection of tube potential and current in therapeutic use of X-rays?
What is the significance of the source-axis distance (SAD) in a cobalt-60 machine?
What is the significance of the source-axis distance (SAD) in a cobalt-60 machine?
What is the ideal type of selection for tube potential, current, and filter on a therapy machine console?
What is the ideal type of selection for tube potential, current, and filter on a therapy machine console?
What is the purpose of the switches on the console of the therapy machine?
What is the purpose of the switches on the console of the therapy machine?
What type of movement is allowed by the design of the tube stand?
What type of movement is allowed by the design of the tube stand?
What is the purpose of the electrical or mechanical brakes on the tube stand?
What is the purpose of the electrical or mechanical brakes on the tube stand?
What is the purpose of the scales on the tube stand?
What is the purpose of the scales on the tube stand?
What is the primary purpose of the steel shell with lead in the source head?
What is the primary purpose of the steel shell with lead in the source head?
What happens when the source is in the BEAM-OFF position?
What happens when the source is in the BEAM-OFF position?
What is the purpose of the source indicator rod?
What is the purpose of the source indicator rod?
What should be done first in case of an accidental source stuck?
What should be done first in case of an accidental source stuck?
What is the purpose of the T-rod?
What is the purpose of the T-rod?
What is the safety feature incorporated in both methods of moving the tele-therapy source?
What is the safety feature incorporated in both methods of moving the tele-therapy source?
What was the primary advantage of the rotating gantry-mounted machines in gamma-ray teletherapy?
What was the primary advantage of the rotating gantry-mounted machines in gamma-ray teletherapy?
What was the consequence of the massive shielding for the radioactive source on the gantry assembly?
What was the consequence of the massive shielding for the radioactive source on the gantry assembly?
What was the advantage of the pitch and roll movements available on some machines?
What was the advantage of the pitch and roll movements available on some machines?
How did the compact room design address the radiation protection requirements?
How did the compact room design address the radiation protection requirements?
What was the purpose of the wedges used in these machines?
What was the purpose of the wedges used in these machines?
What type of treatments were often performed using the pitch and roll movements?
What type of treatments were often performed using the pitch and roll movements?
What was used to control the radiation delivery in the absence of dosimetry monitoring?
What was used to control the radiation delivery in the absence of dosimetry monitoring?
What is the purpose of modifying the exposure time with a transit time?
What is the purpose of modifying the exposure time with a transit time?
How often is the dose rate of the source typically checked by absolute measurement?
How often is the dose rate of the source typically checked by absolute measurement?
What is the consequence of the physical motion of the source?
What is the consequence of the physical motion of the source?
When is the timer error determined?
When is the timer error determined?
What occurs even when the source is in the BEAM-OFF position?
What occurs even when the source is in the BEAM-OFF position?
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