Podcast
Questions and Answers
What is the typical energy level of X-rays used in therapeutic applications?
What is the typical energy level of X-rays used in therapeutic applications?
- Around 0.1 MeV
- Around 1 MeV
- Around 100 MeV
- Around 10 MeV (correct)
What is required for X-rays to be produced?
What is required for X-rays to be produced?
- Photons interacting with matter
- Neutrons interacting with matter
- High energetic electrons interacting with matter (correct)
- Low energetic electrons interacting with matter
What is the primary application of high energy X-rays?
What is the primary application of high energy X-rays?
- Materials analysis
- Diagnostic imaging
- Therapeutic applications (correct)
- Security screening
What is the result of high energetic electrons interacting with matter?
What is the result of high energetic electrons interacting with matter?
What type of energy does X-rays have?
What type of energy does X-rays have?
Why can humans not see X-rays?
Why can humans not see X-rays?
What is a consequence of overexposure to X-rays?
What is a consequence of overexposure to X-rays?
How can X-rays be made visible?
How can X-rays be made visible?
What is a characteristic of X-rays?
What is a characteristic of X-rays?
Why are X-rays used in medical imaging?
Why are X-rays used in medical imaging?
What is the primary function of the cathode in an X-ray tube?
What is the primary function of the cathode in an X-ray tube?
What is the anode in an X-ray tube?
What is the anode in an X-ray tube?
What is the material used to make the cathode filament in an X-ray tube?
What is the material used to make the cathode filament in an X-ray tube?
What is the direction of electron acceleration in an X-ray tube?
What is the direction of electron acceleration in an X-ray tube?
What are the primary considerations when selecting a target material for an X-ray tube?
What are the primary considerations when selecting a target material for an X-ray tube?
What is the main reason why bones appear bright or white in a radiographic film?
What is the main reason why bones appear bright or white in a radiographic film?
Why do the lungs appear dark or black in a radiographic film?
Why do the lungs appear dark or black in a radiographic film?
How do bones interact with the X-ray beam?
How do bones interact with the X-ray beam?
What is the effect of the atomic number of an object on the X-ray beam?
What is the effect of the atomic number of an object on the X-ray beam?
What is the relationship between the atomic number of an object and its appearance in a radiographic film?
What is the relationship between the atomic number of an object and its appearance in a radiographic film?
What is a unique property of electromagnetic radiation?
What is a unique property of electromagnetic radiation?
What can be said about the medium required for electromagnetic radiation to travel?
What can be said about the medium required for electromagnetic radiation to travel?
What is true about the propagation of electromagnetic radiation?
What is true about the propagation of electromagnetic radiation?
What is a characteristic of electromagnetic radiation that sets it apart from other forms of radiation?
What is a characteristic of electromagnetic radiation that sets it apart from other forms of radiation?
In what type of environment can electromagnetic radiation travel?
In what type of environment can electromagnetic radiation travel?
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Study Notes
Electromagnetic Radiation
- Can travel through empty space
- Includes X-rays, which have very high energy (around 10 MeV) used for therapeutic applications
X-ray Production
- Produced when high energetic electrons interact with matter
- Used in airports to see through bags and in medical imaging to see the body
X-ray Tube
- Major components:
- Cathode (electron source)
- Anode (target for X-ray production)
- Glass or metal envelope
- Tube Housing
Cathode
- Source of electrons in the X-ray tube
- Filament of tungsten wire
- Negative pole of the tube potential
- Electrons are accelerated from the cathode to the anode
Anode (Target)
- Two primary considerations when choosing target material:
- Unknown
- X-rays are produced when electrons interact with the target material
Visibility of X-rays
- Humans or animals cannot see X-rays because they are not on our color spectrum
- Wavelength is too small for us to see
- Can be seen using an X-ray imager on a film sheet held up to a light source
Harms of X-rays
- Over exposure can cause burns, possibly leading to death
Radiographic Film
- Lungs appear dark or black on the film because they have low atomic number
- Bones appear bright or white on the film because they have high atomic number and attenuate almost all of the X-ray beam
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