Rad Physics Exam 1 Questions and
Answers Already Passed
What is the main component of the X-ray cassette screen?
a) Aluminum
✔✔b) Phosphor
c) Lead
d) Tungsten
What is the charge of an electron?
a) Positive
✔✔b) Negative
c) Neutral
d) Variable
What is the purpose of a collimator in radiology?
a) Increase beam intensity
b) Reduce scatter radiation
✔✔c) Restrict the size and shape of the X-ray beam
1
,d) Enhance image resolution
What interaction is responsible for most scatter radiation in tissues?
a) Photoelectric effect
✔✔b) Compton scattering
c) Pair production
d) Bremsstrahlung
What material is most commonly used for the target in an X-ray tube?
a) Aluminum
b) Copper
✔✔c) Tungsten
d) Lead
What does kVp control in an X-ray machine?
a) Beam intensity
b) Image contrast
✔✔c) Beam penetration and energy
2
,d) Scatter reduction
What is the function of filtration in an X-ray beam?
a) Increase patient dose
✔✔b) Remove low-energy photons
c) Improve beam intensity
d) Enhance image sharpness
What happens to the X-ray beam intensity as distance from the source doubles?
a) It remains the same
✔✔b) It decreases to one-fourth
c) It doubles
d) It decreases to half
What is the purpose of a rotating anode in an X-ray tube?
a) Reduce X-ray production
✔✔b) Improve heat dissipation
c) Enhance image resolution
3
, d) Focus electrons on the target
Which unit measures radiation exposure in air?
✔✔a) Roentgen (R)
b) Gray (Gy)
c) Sievert (Sv)
d) Becquerel (Bq)
What is the primary source of scatter radiation in diagnostic radiology?
a) X-ray tube housing
✔✔b) The patient's body
c) Lead aprons
d) Image receptor
What is the half-life of a radioactive isotope?
a) The time required for all radioactive atoms to decay
b) The time required for radiation exposure to halve
✔✔c) The time required for half of the radioactive atoms to decay
4
Answers Already Passed
What is the main component of the X-ray cassette screen?
a) Aluminum
✔✔b) Phosphor
c) Lead
d) Tungsten
What is the charge of an electron?
a) Positive
✔✔b) Negative
c) Neutral
d) Variable
What is the purpose of a collimator in radiology?
a) Increase beam intensity
b) Reduce scatter radiation
✔✔c) Restrict the size and shape of the X-ray beam
1
,d) Enhance image resolution
What interaction is responsible for most scatter radiation in tissues?
a) Photoelectric effect
✔✔b) Compton scattering
c) Pair production
d) Bremsstrahlung
What material is most commonly used for the target in an X-ray tube?
a) Aluminum
b) Copper
✔✔c) Tungsten
d) Lead
What does kVp control in an X-ray machine?
a) Beam intensity
b) Image contrast
✔✔c) Beam penetration and energy
2
,d) Scatter reduction
What is the function of filtration in an X-ray beam?
a) Increase patient dose
✔✔b) Remove low-energy photons
c) Improve beam intensity
d) Enhance image sharpness
What happens to the X-ray beam intensity as distance from the source doubles?
a) It remains the same
✔✔b) It decreases to one-fourth
c) It doubles
d) It decreases to half
What is the purpose of a rotating anode in an X-ray tube?
a) Reduce X-ray production
✔✔b) Improve heat dissipation
c) Enhance image resolution
3
, d) Focus electrons on the target
Which unit measures radiation exposure in air?
✔✔a) Roentgen (R)
b) Gray (Gy)
c) Sievert (Sv)
d) Becquerel (Bq)
What is the primary source of scatter radiation in diagnostic radiology?
a) X-ray tube housing
✔✔b) The patient's body
c) Lead aprons
d) Image receptor
What is the half-life of a radioactive isotope?
a) The time required for all radioactive atoms to decay
b) The time required for radiation exposure to halve
✔✔c) The time required for half of the radioactive atoms to decay
4
