,Part I – Multiple Choice Questions
1. What is the annual occupational effective dose limit for radiation workers?
A. 10 mSv
B. 20 mSv
C. 30 mSv
⭕ D. 50 mSv
Rationale: The NRC and NCRP recommend a 50 mSv annual limit for whole-
body occupational exposure.
2. Which projection best demonstrates the intervertebral foramina of the
cervical spine?
A. AP axial
B. Lateral
⭕ C. Oblique
D. Swimmer’s
Rationale: Cervical foramina are best seen in obliques (AP = far side, PA = near
side).
3. Which exposure factor primarily controls image contrast in digital
radiography?
A. mAs
⭕ B. kVp
C. SID
D. Grid ratio
Rationale: kVp controls contrast by influencing x-ray beam penetration.
, 4. Which grid ratio is most effective at removing scatter radiation?
A. 5:1
B. 8:1
C. 10:1
⭕ D. 16:1
Rationale: Higher grid ratios remove more scatter but require increased
technique accuracy.
5. What does ALARA stand for?
A. As Low As Radiation Accepted
⭕ B. As Low As Reasonably Achievable
C. All Levels Are Radiation Allowed
D. As Little As Radiation Accepted
Rationale: ALARA guides radiation safety: keep dose as low as reasonably
achievable.
6. The unit of occupational radiation dose equivalent is:
A. Gray (Gy)
B. Becquerel (Bq)
⭕ C. Sievert (Sv)
D. Curie (Ci)
Rationale: Sievert (Sv) measures effective dose in occupational exposure.
7. What is the most radiosensitive tissue in the body?
A. Muscle
B. Bone
⭕ C. Gonads
1. What is the annual occupational effective dose limit for radiation workers?
A. 10 mSv
B. 20 mSv
C. 30 mSv
⭕ D. 50 mSv
Rationale: The NRC and NCRP recommend a 50 mSv annual limit for whole-
body occupational exposure.
2. Which projection best demonstrates the intervertebral foramina of the
cervical spine?
A. AP axial
B. Lateral
⭕ C. Oblique
D. Swimmer’s
Rationale: Cervical foramina are best seen in obliques (AP = far side, PA = near
side).
3. Which exposure factor primarily controls image contrast in digital
radiography?
A. mAs
⭕ B. kVp
C. SID
D. Grid ratio
Rationale: kVp controls contrast by influencing x-ray beam penetration.
, 4. Which grid ratio is most effective at removing scatter radiation?
A. 5:1
B. 8:1
C. 10:1
⭕ D. 16:1
Rationale: Higher grid ratios remove more scatter but require increased
technique accuracy.
5. What does ALARA stand for?
A. As Low As Radiation Accepted
⭕ B. As Low As Reasonably Achievable
C. All Levels Are Radiation Allowed
D. As Little As Radiation Accepted
Rationale: ALARA guides radiation safety: keep dose as low as reasonably
achievable.
6. The unit of occupational radiation dose equivalent is:
A. Gray (Gy)
B. Becquerel (Bq)
⭕ C. Sievert (Sv)
D. Curie (Ci)
Rationale: Sievert (Sv) measures effective dose in occupational exposure.
7. What is the most radiosensitive tissue in the body?
A. Muscle
B. Bone
⭕ C. Gonads
