Tcdha, dental radiography theory test 1
Questions with Verified Correct Answers
who prescribes radiographs?
Radiographs are prescribed by the dentist, but dental hygienists can make recommendations.
What is the primary benefit of radiographs?
- primary benefit is to detect disease
-they minimize and prevent toothaches
-the benefit outweighs the risk-
saves time and money for the client
- safety procedures for the client while exposing films are taken into consideration
What is the most important use of radiographs?
Detection is the most important use of radiographs.
What is X Radiation?
high energy, ionizing electromagnetic radiation
Which shell has the greatest binding energy?
the strongest binding energy is found closest to the nucleus in the k-shell
Describe ionization and process
- production of ions, or the process of converting atoms into ions
- deals only with electrons and requires sufficient energy to overcome the electrostatic force
that binds the electron to the nucleus
What is primary radiation?
,- X-ray beam that is produced at the target of the anode and exits the tubehead
-Referred to as the primary or useful beam
What is secondary radiation?
- x-radiation that is created when primary beam interacts with matter ex soft tissues of head,
cranial bones and teeth
- less penetrating than primary radiation
What is leakage radiation?
We don't want this. It's bad. Occurs if x-ray tube is not properly sealed and lead lined
What is Compton Scatter?
A phenomenon where an X-ray photon collides with an outer shell electron, resulting in
ionization.
What is coherent scatter?
-UNMODIFIED SCATTER
-Occurs when a low energy x-ray photon interacts with an
outer shell electron
- Results in no change in the atom
- X-ray photon of scattered radiation is produced
-No evidence of ionization
- X-ray photon is "unmodified" ie: it undergoes a change in
direction without a change in energy
-Accounts for only 8% of x-radiation
What is Electromagnetic Radiation?
, - Radiation that is manmade or occurs naturally
-Possesses no mass, no weight, and no electrical charge
- Travels at the speed of light (186,000 miles/second)
- Travels as both a particle and a wave; therefore, both concepts are
considered
- Propagates electric fields at right angles to the path of travel
- Possesses different measurable energies ie: frequencies and
wavelengths
What is WAVELENGTH in Electromagnetic Radiation?
- Distance between crest (peak) of one wave and crest of the next
-Determines energy and penetrating power of radiation
- Measured in nanometers = short wavelengths
-Measured in meters = long wavelengths
- The shorter the distance between the crests, the shorter the
wavelength and higher the energy and ability to penetrate matter
What is FREQUENCY in Electromagnetic Radiation?
- Number of wavelengths that pass a given point in a certain amount
of time
- Frequency and Wavelength are inversely related
- High frequency=short wavelength
- Short frequency=long wavelength
- Low frequency radiation=long wavelength=less energy
- High frequency radiation=short wavelength=more energy
What are the three components of the dental x ray machine?
Questions with Verified Correct Answers
who prescribes radiographs?
Radiographs are prescribed by the dentist, but dental hygienists can make recommendations.
What is the primary benefit of radiographs?
- primary benefit is to detect disease
-they minimize and prevent toothaches
-the benefit outweighs the risk-
saves time and money for the client
- safety procedures for the client while exposing films are taken into consideration
What is the most important use of radiographs?
Detection is the most important use of radiographs.
What is X Radiation?
high energy, ionizing electromagnetic radiation
Which shell has the greatest binding energy?
the strongest binding energy is found closest to the nucleus in the k-shell
Describe ionization and process
- production of ions, or the process of converting atoms into ions
- deals only with electrons and requires sufficient energy to overcome the electrostatic force
that binds the electron to the nucleus
What is primary radiation?
,- X-ray beam that is produced at the target of the anode and exits the tubehead
-Referred to as the primary or useful beam
What is secondary radiation?
- x-radiation that is created when primary beam interacts with matter ex soft tissues of head,
cranial bones and teeth
- less penetrating than primary radiation
What is leakage radiation?
We don't want this. It's bad. Occurs if x-ray tube is not properly sealed and lead lined
What is Compton Scatter?
A phenomenon where an X-ray photon collides with an outer shell electron, resulting in
ionization.
What is coherent scatter?
-UNMODIFIED SCATTER
-Occurs when a low energy x-ray photon interacts with an
outer shell electron
- Results in no change in the atom
- X-ray photon of scattered radiation is produced
-No evidence of ionization
- X-ray photon is "unmodified" ie: it undergoes a change in
direction without a change in energy
-Accounts for only 8% of x-radiation
What is Electromagnetic Radiation?
, - Radiation that is manmade or occurs naturally
-Possesses no mass, no weight, and no electrical charge
- Travels at the speed of light (186,000 miles/second)
- Travels as both a particle and a wave; therefore, both concepts are
considered
- Propagates electric fields at right angles to the path of travel
- Possesses different measurable energies ie: frequencies and
wavelengths
What is WAVELENGTH in Electromagnetic Radiation?
- Distance between crest (peak) of one wave and crest of the next
-Determines energy and penetrating power of radiation
- Measured in nanometers = short wavelengths
-Measured in meters = long wavelengths
- The shorter the distance between the crests, the shorter the
wavelength and higher the energy and ability to penetrate matter
What is FREQUENCY in Electromagnetic Radiation?
- Number of wavelengths that pass a given point in a certain amount
of time
- Frequency and Wavelength are inversely related
- High frequency=short wavelength
- Short frequency=long wavelength
- Low frequency radiation=long wavelength=less energy
- High frequency radiation=short wavelength=more energy
What are the three components of the dental x ray machine?
