RAD 121 FINAL REVIEW QUESTIONS WITH VERIFIED
ANSWERS
States the intensity of the x-ray beam varies inversely proportional to the square of the
distance from the source? - Answers - Inverse Square law
Bremsstrahlung radiation is produced by: - Answers - anode target electron - nuclear
interaction
In a tungsten target, projective electrons must have an energy of at least _________
keV to produce K characteristic x-rays. - Answers - 70
With AOFC, changing the SID from 36" to 72" causes what type of change to the x-ray
intensity of the beam? - Answers - 1/4 the original radiation intensity
Which of the following pathologies would result in decreased receptor exposure if the
technical factors are not adjusted to compensate for the pathology? - Answers -
pulmonary edema
Which of the following factors has the greatest effect on receptor exposure? - Answers -
kVp
Thermionic emission is the release of: - Answers - electrons from a heated cathode
Which relationship listed below is correct about source to image receptor distance, x-ray
intensity, and image receptor exposure? - Answers - as SID increases, intensity
decreases and receptor exposure decreases
Which of the following statements is TRUE about the relationship of receptor exposure
and mAs? - Answers - mAs is directly proportional to receptor exposure and is a
quantitative factor
The atomic mass number of an atom is given by the number of: - Answers - protons and
neutrons
Beam quantity is primarily determined by: - Answers - mAs
Which term describes anatomic tissue or material that absorbs x-rays and appears
white on a radiograph? - Answers - Radiopaque
Electrons are: - Answers - arranged in orbits around the nucleus
During the prep portion of an x-ray exposure: - Answers - the anode begins rotating and
the filament heats up
, The purpose of the cathode filament is to: - Answers - provide electrons for x-ray
production
Characteristic radiation is produced when: - Answers - a vacancy in an electron orbit is
filled
As kVp is increased, the production of bremsstrahlung photons: - Answers - is replaced
by characteristic interactions
Setting the control panel at 70 kVp or higher will produce what percentage of
bremsstrahlung radiation within the x-ray beam? - Answers - 85
The maximum kinetic energy of a projectile electron accelerated across an x-ray tube
depends on the: - Answers - kilovoltage
The quantity of radiation exposure is measured in: - Answers - Colulomb/kilogram
(C/kg)
The factor that alters x-ray beam penetration is: - Answers - kVp
Factors that affect production of scatter radiation are: - Answers - kVp, field size, patient
thickness
The grid ratio is the ratio of the: - Answers - height of the lead strips to the distance
between the lead strips
A variation from the true shape of the part being radiographed is defined as: - Answers -
distortion
Increasing SID causes: - Answers - decreased magnification, increased spacial
resolution
Size distortion will be affected by: - Answers - SID, SOD and OID
In order to increase subject contrast, the technologist should: - Answers - decrease kVp
An increase in the source to image receptor distance will have what effect on penumbra
- Answers - decrease penumbra
The air gap technique is utilized to reduce scatter: - Answers - without the use of a grid
If insufficient photons reach the image receptor, what impact is seen to image quality? -
Answers - quantum mottle
ANSWERS
States the intensity of the x-ray beam varies inversely proportional to the square of the
distance from the source? - Answers - Inverse Square law
Bremsstrahlung radiation is produced by: - Answers - anode target electron - nuclear
interaction
In a tungsten target, projective electrons must have an energy of at least _________
keV to produce K characteristic x-rays. - Answers - 70
With AOFC, changing the SID from 36" to 72" causes what type of change to the x-ray
intensity of the beam? - Answers - 1/4 the original radiation intensity
Which of the following pathologies would result in decreased receptor exposure if the
technical factors are not adjusted to compensate for the pathology? - Answers -
pulmonary edema
Which of the following factors has the greatest effect on receptor exposure? - Answers -
kVp
Thermionic emission is the release of: - Answers - electrons from a heated cathode
Which relationship listed below is correct about source to image receptor distance, x-ray
intensity, and image receptor exposure? - Answers - as SID increases, intensity
decreases and receptor exposure decreases
Which of the following statements is TRUE about the relationship of receptor exposure
and mAs? - Answers - mAs is directly proportional to receptor exposure and is a
quantitative factor
The atomic mass number of an atom is given by the number of: - Answers - protons and
neutrons
Beam quantity is primarily determined by: - Answers - mAs
Which term describes anatomic tissue or material that absorbs x-rays and appears
white on a radiograph? - Answers - Radiopaque
Electrons are: - Answers - arranged in orbits around the nucleus
During the prep portion of an x-ray exposure: - Answers - the anode begins rotating and
the filament heats up
, The purpose of the cathode filament is to: - Answers - provide electrons for x-ray
production
Characteristic radiation is produced when: - Answers - a vacancy in an electron orbit is
filled
As kVp is increased, the production of bremsstrahlung photons: - Answers - is replaced
by characteristic interactions
Setting the control panel at 70 kVp or higher will produce what percentage of
bremsstrahlung radiation within the x-ray beam? - Answers - 85
The maximum kinetic energy of a projectile electron accelerated across an x-ray tube
depends on the: - Answers - kilovoltage
The quantity of radiation exposure is measured in: - Answers - Colulomb/kilogram
(C/kg)
The factor that alters x-ray beam penetration is: - Answers - kVp
Factors that affect production of scatter radiation are: - Answers - kVp, field size, patient
thickness
The grid ratio is the ratio of the: - Answers - height of the lead strips to the distance
between the lead strips
A variation from the true shape of the part being radiographed is defined as: - Answers -
distortion
Increasing SID causes: - Answers - decreased magnification, increased spacial
resolution
Size distortion will be affected by: - Answers - SID, SOD and OID
In order to increase subject contrast, the technologist should: - Answers - decrease kVp
An increase in the source to image receptor distance will have what effect on penumbra
- Answers - decrease penumbra
The air gap technique is utilized to reduce scatter: - Answers - without the use of a grid
If insufficient photons reach the image receptor, what impact is seen to image quality? -
Answers - quantum mottle
