©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Radiation Protection Exam Questions With
Correct Answers 100% Verified.
The source-to-table distance in fixed/stationary fluoroscopy must - Answer✔be at least 15 in.
All of the following device(s) are generally used to help reduce patient dose, except
grid
collimator
gonad shield - Answer✔1
Which of the following contributes most to patient dose? - Answer✔photoelectric effect-
photoelectric effect - Answer✔In the photoelectric effect, a relatively low-energy photon uses
all its energy to eject an inner-shell electron, leaving a vacancy. An electron from the shell
above drops down to fill the vacancy and in so doing emits a characteristic ray. This type of
interaction is most harmful to the patient because all the photon energy is transferred to tissue
compton scatter - Answer✔a high-energy incident photon uses some of its energy to eject an
outer-shell electron. In so doing, the incident photon is deflected with reduced energy but
usually retains most of its energy and exits the body as an energetic scattered ray. The
scattered radiation will either contribute to image fog or pose a radiation hazard to personnel
depending on its direction of exit
classic scatter - Answer✔a low-energy photon interacts with an atom but causes no ionization;
the incident photon disappears in the atom and then reappears immediately and is released as
a photon of identical energy but with changed direction
thompson scatter - Answer✔is another name for classic scatter
Which of the following is (are) likely to improve image quality and decrease patient dose?
Beam restriction
Low kilovolt and high milliampere- second factors
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Grids - Answer✔1
Which of the following will reduce patient dose during fluoroscopy?
1. Decreasing the source-skin distance (SSD)
2. Using 2.5 mm Al filtration
3. Restricting tabletop intensity to less than 10 R/min - Answer✔2 and 3- The use of 2.5 mm Al
equivalent filtration in equipment operated above 70 kVp is also required by law to reduce
patient skin dose
All the following function to reduce patient dose except - Answer✔high ratio grid
How will x-ray photon intensity be affected if the SID is doubled? - Answer✔Its intensity
decreases four times.
The recommendation of "elective booking" states that elective abdominal radiographic
examinations on women of reproductive age should be limited to the - Answer✔10 days
following the onset of menses.
Medical and dental radiation accounts for what percentage of the general public's exposure to
human-made radiation? - Answer✔80%
A controlled area is defined as one
that is occupied by people trained in radiation safety
that is occupied by people who wear radiation monitors
whose occupancy factor is 1 - Answer✔all-A controlled area is one that is occupied by radiation
workers who are trained in radiation safety and who wear radiation monitors. The exposure
rate in a controlled area must not exceed 100 mR/week; its occupancy factor is considered to
be 1, indicating that the area may always be occupied and, therefore, requires maximum
shielding
uncontrolled area - Answer✔is one occupied by the general population; the exposure rate
there must not exceed 10 mR/week. Shielding requirements vary according to several factors,
one being occupancy factor
The principal function of filtration in the x-ray tube is to reduce - Answer✔patient skin dose
The unit of measurement used to express occupational exposure is the - Answer✔rem (sv)
roentgen - Answer✔is the unit of exposure; it measures the quantity of ionizations in air
rad - Answer✔is an acronym for radiation absorbed dose; it measures the energy deposited in
any material
2
Radiation Protection Exam Questions With
Correct Answers 100% Verified.
The source-to-table distance in fixed/stationary fluoroscopy must - Answer✔be at least 15 in.
All of the following device(s) are generally used to help reduce patient dose, except
grid
collimator
gonad shield - Answer✔1
Which of the following contributes most to patient dose? - Answer✔photoelectric effect-
photoelectric effect - Answer✔In the photoelectric effect, a relatively low-energy photon uses
all its energy to eject an inner-shell electron, leaving a vacancy. An electron from the shell
above drops down to fill the vacancy and in so doing emits a characteristic ray. This type of
interaction is most harmful to the patient because all the photon energy is transferred to tissue
compton scatter - Answer✔a high-energy incident photon uses some of its energy to eject an
outer-shell electron. In so doing, the incident photon is deflected with reduced energy but
usually retains most of its energy and exits the body as an energetic scattered ray. The
scattered radiation will either contribute to image fog or pose a radiation hazard to personnel
depending on its direction of exit
classic scatter - Answer✔a low-energy photon interacts with an atom but causes no ionization;
the incident photon disappears in the atom and then reappears immediately and is released as
a photon of identical energy but with changed direction
thompson scatter - Answer✔is another name for classic scatter
Which of the following is (are) likely to improve image quality and decrease patient dose?
Beam restriction
Low kilovolt and high milliampere- second factors
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Grids - Answer✔1
Which of the following will reduce patient dose during fluoroscopy?
1. Decreasing the source-skin distance (SSD)
2. Using 2.5 mm Al filtration
3. Restricting tabletop intensity to less than 10 R/min - Answer✔2 and 3- The use of 2.5 mm Al
equivalent filtration in equipment operated above 70 kVp is also required by law to reduce
patient skin dose
All the following function to reduce patient dose except - Answer✔high ratio grid
How will x-ray photon intensity be affected if the SID is doubled? - Answer✔Its intensity
decreases four times.
The recommendation of "elective booking" states that elective abdominal radiographic
examinations on women of reproductive age should be limited to the - Answer✔10 days
following the onset of menses.
Medical and dental radiation accounts for what percentage of the general public's exposure to
human-made radiation? - Answer✔80%
A controlled area is defined as one
that is occupied by people trained in radiation safety
that is occupied by people who wear radiation monitors
whose occupancy factor is 1 - Answer✔all-A controlled area is one that is occupied by radiation
workers who are trained in radiation safety and who wear radiation monitors. The exposure
rate in a controlled area must not exceed 100 mR/week; its occupancy factor is considered to
be 1, indicating that the area may always be occupied and, therefore, requires maximum
shielding
uncontrolled area - Answer✔is one occupied by the general population; the exposure rate
there must not exceed 10 mR/week. Shielding requirements vary according to several factors,
one being occupancy factor
The principal function of filtration in the x-ray tube is to reduce - Answer✔patient skin dose
The unit of measurement used to express occupational exposure is the - Answer✔rem (sv)
roentgen - Answer✔is the unit of exposure; it measures the quantity of ionizations in air
rad - Answer✔is an acronym for radiation absorbed dose; it measures the energy deposited in
any material
2
