RADT Exam Questions and A+ Answers. Latest Released
Update. 2025/2026 Edition.
Terms in this set (128)
1. Source of electrons (x-ray generators, Cathode)
What 3 things are needed to
2. A means of accelerating electrons (kV + mA)
generate x- rays?
3. A hard, dense target for electrons to hit (Tungsten Disk Anode)
Interactions in the x-ray tube - bremsstrahlung radiation
between - Characteristic Radiation
filament electrons and anode target
atoms
useful beam
Primary beam interactions in the x-ray tube between the filament electrons and anode
target atoms
- Bremsstrahlung Radiation
- Characteristic Radiation
Secondary beam Interactions in the body between x-ray photons and tissue atoms
Bremsstrahlung
Two types of primary radiation
Radiation and
Characteristic
Radiation
- classical
- compton
Interactions in the body
- photoelectric
between x-ray photons and - pair production
tissue atoms - photodisintegration
classical,
Compton,
5 types of scatter photoelectric,
pair production, photodisintegration
, 1. Heat Production
Electron Target Interactions 2. Bremsstrahlung Radiation
3. CharacteristicRadiation
projectile electrons Electrons traveling from cathode to anode (1-3cm) @ half the speed of light
Electrons travel from cathode to anode (1-3cm) at about half the speed of
light
(projectile electrons)
Heat Production Some electrons are not sufficient energy to ionize
the target atoms 99% of kinetic energy of
projectile electrons are converted to heat as kV
increases = efficiency increases
What percentage of projectile 99% of kinetic energy of projectile electrons are converted to heat
electrons are converted into
heat?
As kV increases, efficiency As kV increases, efficiency increases
---------
What percentage of projectile 1% of projectile electrons convert into photon energy
electrons convert into photon
energy?
Heat unit calculation for Single kV x mA x sec x # of exposures = Heat Units for Single Phase
phase
generator
Heat Unit calculation for kV x mA x sec x 1.35 x # of exposures
3 Phase, 6 Pulse = Heat Units for 3 Phase, 6 Pulse
Heat Unit calculation for kV x mA x sec x 1.41 x # of exposures
3 Phase, 12 Pulse = Heat Units for 3 Phase, 12 Pulse
Heat Unit calculation for kV x mA x sec x 1.45 x # of exposures
High Frequency = Heat Units for High Frequency
Milliseconds to seconds divide by 1000
Update. 2025/2026 Edition.
Terms in this set (128)
1. Source of electrons (x-ray generators, Cathode)
What 3 things are needed to
2. A means of accelerating electrons (kV + mA)
generate x- rays?
3. A hard, dense target for electrons to hit (Tungsten Disk Anode)
Interactions in the x-ray tube - bremsstrahlung radiation
between - Characteristic Radiation
filament electrons and anode target
atoms
useful beam
Primary beam interactions in the x-ray tube between the filament electrons and anode
target atoms
- Bremsstrahlung Radiation
- Characteristic Radiation
Secondary beam Interactions in the body between x-ray photons and tissue atoms
Bremsstrahlung
Two types of primary radiation
Radiation and
Characteristic
Radiation
- classical
- compton
Interactions in the body
- photoelectric
between x-ray photons and - pair production
tissue atoms - photodisintegration
classical,
Compton,
5 types of scatter photoelectric,
pair production, photodisintegration
, 1. Heat Production
Electron Target Interactions 2. Bremsstrahlung Radiation
3. CharacteristicRadiation
projectile electrons Electrons traveling from cathode to anode (1-3cm) @ half the speed of light
Electrons travel from cathode to anode (1-3cm) at about half the speed of
light
(projectile electrons)
Heat Production Some electrons are not sufficient energy to ionize
the target atoms 99% of kinetic energy of
projectile electrons are converted to heat as kV
increases = efficiency increases
What percentage of projectile 99% of kinetic energy of projectile electrons are converted to heat
electrons are converted into
heat?
As kV increases, efficiency As kV increases, efficiency increases
---------
What percentage of projectile 1% of projectile electrons convert into photon energy
electrons convert into photon
energy?
Heat unit calculation for Single kV x mA x sec x # of exposures = Heat Units for Single Phase
phase
generator
Heat Unit calculation for kV x mA x sec x 1.35 x # of exposures
3 Phase, 6 Pulse = Heat Units for 3 Phase, 6 Pulse
Heat Unit calculation for kV x mA x sec x 1.41 x # of exposures
3 Phase, 12 Pulse = Heat Units for 3 Phase, 12 Pulse
Heat Unit calculation for kV x mA x sec x 1.45 x # of exposures
High Frequency = Heat Units for High Frequency
Milliseconds to seconds divide by 1000
