Oklahoma Dental Radiation
Protection and Safety Exam
2026/2027 | Certification Preparation
| 100 Questions with Verified Answers
1. What is radiation?
Answer: Energy that travels through space as a wave or a stream
of particles.
2. What is an x-ray?
Answer: An ionizing form of radiation that travels in a wave.
3. What is a radiograph?
Answer: A picture produced when x-rays pass through an object
and interact with a radiation-sensitive receptor.
4. Who discovered x-rays in 1895?
Answer: Wilhelm Conrad Roentgen.
5. What is the smallest unit of matter?
Answer: An atom.
6. What are the three primary particles of an atom?
Answer: Proton (positive), neutron (neutral), and electron
(negative).
,7. What does "radiolucent" mean on a radiograph?
Answer: Areas where x-rays passed through the tissue and
reached the receptor, appearing dark gray or black.
8. What does "radiopaque" mean on a radiograph?
Answer: Areas where x-rays were blocked and did not reach the
receptor, appearing white or light gray.
9. What does "density" refer to in a radiograph?
Answer: The overall darkness or blackness of the image.
10. What does "contrast" refer to in a radiograph?
Answer: The shading differences between adjacent areas on the
image.
X-ray Production & Equipment
11. What is the function of the anode in an x-ray tube?
Answer: The anode is the positive electrode that contains the
tungsten target from which x-rays are emitted.
12. What is "Bremsstrahlung" radiation?
Answer: "Braking radiation," which is the release of a photon of
energy by an electron as it is slowed and bent off course by the
nucleus of a target atom.
13. What is the purpose of a collimator?
Answer: To restrict the size and shape of the x-ray beam,
reducing patient exposure. Dr. William Rollins is credited with
creating the first one.
, 14. What two factors primarily influence the speed of
electrons traveling from the cathode to the anode?
Answer: Tubehead voltage and current.
15. What primarily controls digital image contrast in dental
radiography?
Answer: Exposure settings.
Biological Effects & Radiation Safety
16. What does ALARA stand for?
Answer: As Low As Reasonably Achievable.
17. What is ionization?
Answer: The process of an atom losing or gaining electrons,
producing charged particles called ions. This can cause changes in
receptors and tissues.
18. What is the relationship between wavelength and energy
of radiation?
Answer: The shorter the wavelength, the greater the energy.
19. What is the definition of a carcinogen?
Answer: Any cancer-producing substance.
20. What is a cataract?
Answer: A condition where the lens of the eye becomes opaque,
which can be caused by radiation exposure.
Protection and Safety Exam
2026/2027 | Certification Preparation
| 100 Questions with Verified Answers
1. What is radiation?
Answer: Energy that travels through space as a wave or a stream
of particles.
2. What is an x-ray?
Answer: An ionizing form of radiation that travels in a wave.
3. What is a radiograph?
Answer: A picture produced when x-rays pass through an object
and interact with a radiation-sensitive receptor.
4. Who discovered x-rays in 1895?
Answer: Wilhelm Conrad Roentgen.
5. What is the smallest unit of matter?
Answer: An atom.
6. What are the three primary particles of an atom?
Answer: Proton (positive), neutron (neutral), and electron
(negative).
,7. What does "radiolucent" mean on a radiograph?
Answer: Areas where x-rays passed through the tissue and
reached the receptor, appearing dark gray or black.
8. What does "radiopaque" mean on a radiograph?
Answer: Areas where x-rays were blocked and did not reach the
receptor, appearing white or light gray.
9. What does "density" refer to in a radiograph?
Answer: The overall darkness or blackness of the image.
10. What does "contrast" refer to in a radiograph?
Answer: The shading differences between adjacent areas on the
image.
X-ray Production & Equipment
11. What is the function of the anode in an x-ray tube?
Answer: The anode is the positive electrode that contains the
tungsten target from which x-rays are emitted.
12. What is "Bremsstrahlung" radiation?
Answer: "Braking radiation," which is the release of a photon of
energy by an electron as it is slowed and bent off course by the
nucleus of a target atom.
13. What is the purpose of a collimator?
Answer: To restrict the size and shape of the x-ray beam,
reducing patient exposure. Dr. William Rollins is credited with
creating the first one.
, 14. What two factors primarily influence the speed of
electrons traveling from the cathode to the anode?
Answer: Tubehead voltage and current.
15. What primarily controls digital image contrast in dental
radiography?
Answer: Exposure settings.
Biological Effects & Radiation Safety
16. What does ALARA stand for?
Answer: As Low As Reasonably Achievable.
17. What is ionization?
Answer: The process of an atom losing or gaining electrons,
producing charged particles called ions. This can cause changes in
receptors and tissues.
18. What is the relationship between wavelength and energy
of radiation?
Answer: The shorter the wavelength, the greater the energy.
19. What is the definition of a carcinogen?
Answer: Any cancer-producing substance.
20. What is a cataract?
Answer: A condition where the lens of the eye becomes opaque,
which can be caused by radiation exposure.
