Rad Physics Exam1 Questions and
Answers
Which of the following are examples of electromagnetic ionizing radiation?
A. gamma and alpha radiation
B. beta and x-ray radiation
C. x-ray and gamma radiation
D. alpha and beta radiation - Answer-C. x-ray and gamma radiation
Which type of dose is attributed to harmful effects from low levels of radiation?
A. genetic
B. somatic
C. whole body
D. skin entrance - Answer-A. genetic
Is there any logical way that your time spent in Davenport, IA would be exposed to alpha particles?
A. no
B. yes, by breathing the QC air
C. yes, by eating food made by Oscar Meyer
,D. yes, by shaking hands with potential patients
E. yes, by staring into my TV in my little, cheap run down apartment - Answer-B. yes by breathing the
QC air
The large or small focal spot is usually set simultaneously with what?
A. the timer
B. the kilovolts
C. the tube distance
D. the milliameres - Answer-D. the milliamperes
If you wanted to increase the number of photons reaching your film, which could you do?
A. increase the kV
B. increase the mA
C. increase the filtration
D. increase the tube distance - Answer-B. increase the mA
What governs the speed of electrons?
A. time
B. kV
C. mA
D. Filament size - Answer-B. kV
Comparing two films with the kV and mAs constant, one taken at 40 FFD and the other at 72 FFD, which
of the following would occur?
A. decreased density of the 40; increased image size of 72
B. decreased density of the 72; decreased image size of 40
,C. increased density of 40; decreased image size of 72
D. increased density of 72; increased image size of 40 - Answer-C
Which of the following is responsible for changing AC current to DC current?
A. 220 volts
B. a rectifier
C. a transformer
D. a tube rating chart - Answer-B. a rectifier
How would one figure heat units if one was so inclined to do so?
A. SID x kV x mA
B. time x mA x FFD
C. kV x FFD x time
D. mA x time x kVp
E. kVp x mA x time x SID - Answer-D. mA x time x kVp
At the usual kV range that you will be x-raying spines with, which of the following makes up the majority
of the beam?
A. bremsstrahlung radiation
B. characteristic radiation
C. scattered radiation
D. off focus radiation - Answer-A.
(BEaM -- BrEMsstrahlung)
How much energy created by an exposure in an x-ray tube is useful for the production of the
radiograph?
, A. 1%
B. 3%
C. 5%
D. 7% - Answer-A. 1% (99% is heat)
What is the main function of the anode?
A. to propel electrons
B. to produce electrons
C. to stop the electrons
D. to produce a space charge - Answer-C. to stop the electrons
Of the following, which produces thermionic emission?
A. the timer circuit
B. the low voltage circuit
C. the high voltage circuit
D. the step up transformer - Answer-B. the low voltage circuit
Which of the following is responsible for the anode heel effect?
A. the target material
B. the anode stem
C. the bevel of the anode
D. the focal spot size - Answer-C. the bevel of the anode
The "boiling off" of electrons is known by which term?
A. half value layer
Answers
Which of the following are examples of electromagnetic ionizing radiation?
A. gamma and alpha radiation
B. beta and x-ray radiation
C. x-ray and gamma radiation
D. alpha and beta radiation - Answer-C. x-ray and gamma radiation
Which type of dose is attributed to harmful effects from low levels of radiation?
A. genetic
B. somatic
C. whole body
D. skin entrance - Answer-A. genetic
Is there any logical way that your time spent in Davenport, IA would be exposed to alpha particles?
A. no
B. yes, by breathing the QC air
C. yes, by eating food made by Oscar Meyer
,D. yes, by shaking hands with potential patients
E. yes, by staring into my TV in my little, cheap run down apartment - Answer-B. yes by breathing the
QC air
The large or small focal spot is usually set simultaneously with what?
A. the timer
B. the kilovolts
C. the tube distance
D. the milliameres - Answer-D. the milliamperes
If you wanted to increase the number of photons reaching your film, which could you do?
A. increase the kV
B. increase the mA
C. increase the filtration
D. increase the tube distance - Answer-B. increase the mA
What governs the speed of electrons?
A. time
B. kV
C. mA
D. Filament size - Answer-B. kV
Comparing two films with the kV and mAs constant, one taken at 40 FFD and the other at 72 FFD, which
of the following would occur?
A. decreased density of the 40; increased image size of 72
B. decreased density of the 72; decreased image size of 40
,C. increased density of 40; decreased image size of 72
D. increased density of 72; increased image size of 40 - Answer-C
Which of the following is responsible for changing AC current to DC current?
A. 220 volts
B. a rectifier
C. a transformer
D. a tube rating chart - Answer-B. a rectifier
How would one figure heat units if one was so inclined to do so?
A. SID x kV x mA
B. time x mA x FFD
C. kV x FFD x time
D. mA x time x kVp
E. kVp x mA x time x SID - Answer-D. mA x time x kVp
At the usual kV range that you will be x-raying spines with, which of the following makes up the majority
of the beam?
A. bremsstrahlung radiation
B. characteristic radiation
C. scattered radiation
D. off focus radiation - Answer-A.
(BEaM -- BrEMsstrahlung)
How much energy created by an exposure in an x-ray tube is useful for the production of the
radiograph?
, A. 1%
B. 3%
C. 5%
D. 7% - Answer-A. 1% (99% is heat)
What is the main function of the anode?
A. to propel electrons
B. to produce electrons
C. to stop the electrons
D. to produce a space charge - Answer-C. to stop the electrons
Of the following, which produces thermionic emission?
A. the timer circuit
B. the low voltage circuit
C. the high voltage circuit
D. the step up transformer - Answer-B. the low voltage circuit
Which of the following is responsible for the anode heel effect?
A. the target material
B. the anode stem
C. the bevel of the anode
D. the focal spot size - Answer-C. the bevel of the anode
The "boiling off" of electrons is known by which term?
A. half value layer
