RR 3.2 – RAD PROTECTION QUESTIONS
AND ANSWERS
If the entrance dose for a particular exam is 1200 mGy, the radiation exposure at 1
m from the patient will be approximately
A. 120 mGy
B. 12.0 mGy
C. 1.20 mGy
D. 0.12 mGy - Answer- C. 1.20 mGy
Classify the following tissues in order of increasing radiosensitivity
1. Liver cells
2. Intestinal crypt cells
3. Muscle cells
A. 1, 3, 2
B. 2, 3, 1
C. 2, 1, 3
D. 3, 3, 2 - Answer- D. 3, 3, 2
Differential absorption of the x-ray beam is dependent on
1. Atomic number of the irradiated tissues
2. Collimation
3. Beam quality
4. Part density
A. 1 and 4 only
B. 2 and 3 only
C. 2 and 4 only
D. 1, 3, and 4 only - Answer- D. 1, 3, and 4 only
The interaction illustrated below
1. can pose a safety hazard to personnel
2. can have a negative impact on image quality
3. occurs with low-energy incident photons
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3 - Answer- B. 1 and 2 only
Which of the following has(have) been identified as source(s) of radon exposure?
1. Indoors, in houses
2. Smoking cigarettes
3. Radiology departments
, A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3 - Answer- B. 1 and 2 only
Primary radiation barriers must be at least how high?
A. 5 ft.
B. 6 ft.
C. 7 ft.
D. 8 ft. - Answer- C. 7 ft.
The dose equivalent limit for a radiography student under the age of 18 years is
A 50 mSv
B 150 mSv
C 1.0 mSv
D 500 mSv - Answer- C 1.0 mSv
What is the intensity of scattered radiation perpendicular to and 1 m from a patient
compared with the useful beam at the patient's surface?
A. 0.01%
B. 0.1%
C. 1.0%
D. 10.0% - Answer- B. 0.1%
The reduction in the intensity of an x-ray beam as it passes through material is
termed
A. absorption
B. scattering
C. attenuation
D. divergence - Answer- C. attenuation
When an individual will receive more than 1/10 of the radiation dose limit, which
steps must be taken?
1. They are issued a radiation dosimeter
2. They must wear a lead apron during work hours to reduce dose
3. Their annual dose will be monitored
A. 1 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2, and 3 - Answer- C. 1 and 3 only
Any wall that the useful x-ray beam can be directed toward is called a
A. secondary barrier
B. primary barrier
C. leakage barrier
AND ANSWERS
If the entrance dose for a particular exam is 1200 mGy, the radiation exposure at 1
m from the patient will be approximately
A. 120 mGy
B. 12.0 mGy
C. 1.20 mGy
D. 0.12 mGy - Answer- C. 1.20 mGy
Classify the following tissues in order of increasing radiosensitivity
1. Liver cells
2. Intestinal crypt cells
3. Muscle cells
A. 1, 3, 2
B. 2, 3, 1
C. 2, 1, 3
D. 3, 3, 2 - Answer- D. 3, 3, 2
Differential absorption of the x-ray beam is dependent on
1. Atomic number of the irradiated tissues
2. Collimation
3. Beam quality
4. Part density
A. 1 and 4 only
B. 2 and 3 only
C. 2 and 4 only
D. 1, 3, and 4 only - Answer- D. 1, 3, and 4 only
The interaction illustrated below
1. can pose a safety hazard to personnel
2. can have a negative impact on image quality
3. occurs with low-energy incident photons
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3 - Answer- B. 1 and 2 only
Which of the following has(have) been identified as source(s) of radon exposure?
1. Indoors, in houses
2. Smoking cigarettes
3. Radiology departments
, A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3 - Answer- B. 1 and 2 only
Primary radiation barriers must be at least how high?
A. 5 ft.
B. 6 ft.
C. 7 ft.
D. 8 ft. - Answer- C. 7 ft.
The dose equivalent limit for a radiography student under the age of 18 years is
A 50 mSv
B 150 mSv
C 1.0 mSv
D 500 mSv - Answer- C 1.0 mSv
What is the intensity of scattered radiation perpendicular to and 1 m from a patient
compared with the useful beam at the patient's surface?
A. 0.01%
B. 0.1%
C. 1.0%
D. 10.0% - Answer- B. 0.1%
The reduction in the intensity of an x-ray beam as it passes through material is
termed
A. absorption
B. scattering
C. attenuation
D. divergence - Answer- C. attenuation
When an individual will receive more than 1/10 of the radiation dose limit, which
steps must be taken?
1. They are issued a radiation dosimeter
2. They must wear a lead apron during work hours to reduce dose
3. Their annual dose will be monitored
A. 1 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2, and 3 - Answer- C. 1 and 3 only
Any wall that the useful x-ray beam can be directed toward is called a
A. secondary barrier
B. primary barrier
C. leakage barrier
