Virginia Dental Assistant Radiography
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which type of radiation is primarily used in dental radiography to
produce diagnostic images?
A. Alpha radiation
B. Beta radiation
C. X-radiation
D. Gamma radiation
Rationale: X-radiation is the form of electromagnetic energy used in dental
imaging because it can penetrate tissues and create diagnostic images on
receptors.
2. The purpose of the lead apron during dental radiographic procedures
is to:
A. Improve image density
B. Stabilize the patient's head
C. Increase exposure time
D. Reduce unnecessary radiation exposure
,Rationale: Lead aprons help shield radiosensitive tissues from scatter
radiation and reduce unnecessary exposure to patients.
3. Which principle states that radiation exposure should be kept as low as
reasonably achievable?
A. OSHA Principle
B. Infection Control Principle
C. ALARA Principle
D. HIPAA Principle
Rationale: ALARA stands for "As Low As Reasonably Achievable" and
guides radiation safety practices.
4. The cathode in an X-ray tube contains:
A. Tungsten target
B. Lead shield
C. Aluminum filter
D. Filament
Rationale: The cathode contains a tungsten filament that releases
electrons when heated.
5. Electrons travel from the cathode to the:
A. PID
B. Collimator
C. Anode
D. Sensor
Rationale: Electrons emitted from the cathode are accelerated toward the
positively charged anode.
6. The tungsten target is located in the:
, A. PID
B. Cathode
C. Filter
D. Anode
Rationale: The tungsten target within the anode converts electron energy
into X-rays.
7. The majority of energy produced during X-ray generation becomes:
A. Diagnostic radiation
B. Scatter radiation
C. Light energy
D. Heat
Rationale: Approximately 99% of electron energy is converted into heat,
while only a small portion becomes X-rays.
8. What is the function of aluminum filters in dental X-ray equipment?
A. Increase scatter radiation
B. Focus electrons
C. Remove low-energy X-rays
D. Stabilize film packets
Rationale: Aluminum filters absorb low-energy X-rays that would not
contribute to image quality and would increase patient dose.
9. The collimator functions to:
A. Increase radiation output
B. Cool the tube head
C. Restrict the size and shape of the X-ray beam
D. Process radiographs
Rationale: Collimators reduce patient exposure by limiting beam size.
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which type of radiation is primarily used in dental radiography to
produce diagnostic images?
A. Alpha radiation
B. Beta radiation
C. X-radiation
D. Gamma radiation
Rationale: X-radiation is the form of electromagnetic energy used in dental
imaging because it can penetrate tissues and create diagnostic images on
receptors.
2. The purpose of the lead apron during dental radiographic procedures
is to:
A. Improve image density
B. Stabilize the patient's head
C. Increase exposure time
D. Reduce unnecessary radiation exposure
,Rationale: Lead aprons help shield radiosensitive tissues from scatter
radiation and reduce unnecessary exposure to patients.
3. Which principle states that radiation exposure should be kept as low as
reasonably achievable?
A. OSHA Principle
B. Infection Control Principle
C. ALARA Principle
D. HIPAA Principle
Rationale: ALARA stands for "As Low As Reasonably Achievable" and
guides radiation safety practices.
4. The cathode in an X-ray tube contains:
A. Tungsten target
B. Lead shield
C. Aluminum filter
D. Filament
Rationale: The cathode contains a tungsten filament that releases
electrons when heated.
5. Electrons travel from the cathode to the:
A. PID
B. Collimator
C. Anode
D. Sensor
Rationale: Electrons emitted from the cathode are accelerated toward the
positively charged anode.
6. The tungsten target is located in the:
, A. PID
B. Cathode
C. Filter
D. Anode
Rationale: The tungsten target within the anode converts electron energy
into X-rays.
7. The majority of energy produced during X-ray generation becomes:
A. Diagnostic radiation
B. Scatter radiation
C. Light energy
D. Heat
Rationale: Approximately 99% of electron energy is converted into heat,
while only a small portion becomes X-rays.
8. What is the function of aluminum filters in dental X-ray equipment?
A. Increase scatter radiation
B. Focus electrons
C. Remove low-energy X-rays
D. Stabilize film packets
Rationale: Aluminum filters absorb low-energy X-rays that would not
contribute to image quality and would increase patient dose.
9. The collimator functions to:
A. Increase radiation output
B. Cool the tube head
C. Restrict the size and shape of the X-ray beam
D. Process radiographs
Rationale: Collimators reduce patient exposure by limiting beam size.
