RADT 142 Unit 5 Review Questions
with Correct Answers
When are characteristic x-rays produced? - Answer-orbital electrons move from an
outer shell to fill an inner shell vacancy
A decrease of 15 percent in kVp is equivalent to decrease mAs by ________ - Answer-
50%
Which of the following results in the equivalent of doubling the mAs if the original kVp is
40? - Answer-46 kVp
15 percent rule
40 (.15) =6
40+6=46
If the kV selected was 90, what would be the average radiation - Answer-30 keV
The photoelectric effect is an interaction between an x-ray photon and....... - Answer-an
inner shell electron
Which of the following changes occur when the kilo-voltage energy is increase from 65
to 80 ? - Answer-frequency increases
A 15 percent increase in kVp has __________ effect on radiographic density than a 15
percent increase in mAs . - Answer-much greater
Which of the following illustrates the inverse square law?1. Distance is a most effective
protection from radiation2. Distance is a rather ineffective protection from radiation3. As
distance from the radiation source decreases, radiation decreases. - Answer-1 only
A continuous emission spectrum is a graphic representation of - Answer-
Bremsstrahlung radiation
An increase of 15 percent in kVp is equivalent to increasing mAs by ________ -
Answer-100%
Which of the following factors affect beam quantity ?
all choses
kVp
distance
, filtration - Answer-All
In which of the follow interactions is a nuclear fragment ejected? - Answer-
photodisintegration
How does an increase in mAs affect the size of the amplitude and/or the position of the
emission graph? - Answer-An increase in mAs increases the amplitude of the emission
spectrum but does not affect the position of the graph
What happens to the efficiency of x-ray production as the voltage across the x-ray tube
Decreases? - Answer-As the voltage decreases, the efficiency of x-ray production
decreases
The releasing of the binding energy produced what kind of x-rays radiation? - Answer-
Characteristic radiation
Based on the PowerPoint, what is another name for compton scatter
radiation:___________________ - Answer-Modified scatter radiation
Based on the PowerPoint, what are the other names for classical
scatterRadiation:__________________ - Answer-Unmodified, Coherent, Thomson, or
Rayleigh scatter
It is often stated that mAs primarily controls quantity and kVp primarily
Controls_________ - Answer-Quality
The THICK end of the wedge filter should be placed at which end of the foot for a
properly exposed radiograph (toes or heel)? - Answer-Toes
What minimum total amount of filtration (inherent plus added) is required in x-ray
equipment operated above 70 kVp? - Answer-2.5 mm aluminum
Which electron shell interaction produce the most useful diagnostic x-ray radiation? -
Answer-The K-shell
What happen to radiation intensity and radiographic density if mAs increase from 30 to
60 and by how much? - Answer-Radiation intensity and radiographic density will both
double
How is frequency affected if energy (kV) is decreased? - Answer-Frequency decreases
as energy decreases
Which type of scatter/secondary radiation produced annihilation reaction? - Answer-Pair
production results in an annihilation reaction
with Correct Answers
When are characteristic x-rays produced? - Answer-orbital electrons move from an
outer shell to fill an inner shell vacancy
A decrease of 15 percent in kVp is equivalent to decrease mAs by ________ - Answer-
50%
Which of the following results in the equivalent of doubling the mAs if the original kVp is
40? - Answer-46 kVp
15 percent rule
40 (.15) =6
40+6=46
If the kV selected was 90, what would be the average radiation - Answer-30 keV
The photoelectric effect is an interaction between an x-ray photon and....... - Answer-an
inner shell electron
Which of the following changes occur when the kilo-voltage energy is increase from 65
to 80 ? - Answer-frequency increases
A 15 percent increase in kVp has __________ effect on radiographic density than a 15
percent increase in mAs . - Answer-much greater
Which of the following illustrates the inverse square law?1. Distance is a most effective
protection from radiation2. Distance is a rather ineffective protection from radiation3. As
distance from the radiation source decreases, radiation decreases. - Answer-1 only
A continuous emission spectrum is a graphic representation of - Answer-
Bremsstrahlung radiation
An increase of 15 percent in kVp is equivalent to increasing mAs by ________ -
Answer-100%
Which of the following factors affect beam quantity ?
all choses
kVp
distance
, filtration - Answer-All
In which of the follow interactions is a nuclear fragment ejected? - Answer-
photodisintegration
How does an increase in mAs affect the size of the amplitude and/or the position of the
emission graph? - Answer-An increase in mAs increases the amplitude of the emission
spectrum but does not affect the position of the graph
What happens to the efficiency of x-ray production as the voltage across the x-ray tube
Decreases? - Answer-As the voltage decreases, the efficiency of x-ray production
decreases
The releasing of the binding energy produced what kind of x-rays radiation? - Answer-
Characteristic radiation
Based on the PowerPoint, what is another name for compton scatter
radiation:___________________ - Answer-Modified scatter radiation
Based on the PowerPoint, what are the other names for classical
scatterRadiation:__________________ - Answer-Unmodified, Coherent, Thomson, or
Rayleigh scatter
It is often stated that mAs primarily controls quantity and kVp primarily
Controls_________ - Answer-Quality
The THICK end of the wedge filter should be placed at which end of the foot for a
properly exposed radiograph (toes or heel)? - Answer-Toes
What minimum total amount of filtration (inherent plus added) is required in x-ray
equipment operated above 70 kVp? - Answer-2.5 mm aluminum
Which electron shell interaction produce the most useful diagnostic x-ray radiation? -
Answer-The K-shell
What happen to radiation intensity and radiographic density if mAs increase from 30 to
60 and by how much? - Answer-Radiation intensity and radiographic density will both
double
How is frequency affected if energy (kV) is decreased? - Answer-Frequency decreases
as energy decreases
Which type of scatter/secondary radiation produced annihilation reaction? - Answer-Pair
production results in an annihilation reaction
