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Questions and Answers
What is the typical energy level of X-rays used in therapeutic applications?
What is required for X-rays to be produced?
What is the primary application of high energy X-rays?
What is the result of high energetic electrons interacting with matter?
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What type of energy does X-rays have?
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Why can humans not see X-rays?
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What is a consequence of overexposure to X-rays?
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How can X-rays be made visible?
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What is a characteristic of X-rays?
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Why are X-rays used in medical imaging?
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What is the primary function of the cathode in an X-ray tube?
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What is the anode in an X-ray tube?
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What is the material used to make the cathode filament in an X-ray tube?
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What is the direction of electron acceleration in an X-ray tube?
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What are the primary considerations when selecting a target material for an X-ray tube?
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What is the main reason why bones appear bright or white in a radiographic film?
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Why do the lungs appear dark or black in a radiographic film?
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How do bones interact with the X-ray beam?
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What is the effect of the atomic number of an object on the X-ray beam?
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What is the relationship between the atomic number of an object and its appearance in a radiographic film?
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What is a unique property of electromagnetic radiation?
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What can be said about the medium required for electromagnetic radiation to travel?
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What is true about the propagation of electromagnetic radiation?
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What is a characteristic of electromagnetic radiation that sets it apart from other forms of radiation?
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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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Description
Quiz about the general properties of electromagnetic radiation, including its ability to travel through empty space.
