DAS 130 FINAL EXAM QUESTIONS WITH ANSWERS 2025/2026
GRADED A+
Rare earth screens - have phosphors that emit green light
Duplicating film - is used to make an identical copy of an intraoral or extraoral
radiograph
Film is best stored in an area that is - cool and dry
An oral examination limits the practitioner to knowledge of what is seen clinically. Dental
images allow the practitioner to see many conditions that are not apparent clinically -
Both statements are true.
Through the use of dental images, the dental radiographer can detect ________ that
cannot be detected clinically. - - diseases
- lesions
- lesions
When dental images are properly prescribed, exposed, and processed, the benefit of
disease detection ____________ the risk of small doses of x-radiation. - far outweighs
A ______________ may be a dental radiographer. - - Dentist
- dental hygienist
-dental assistant
A new patient arrives to your dental office, and you will be the dental radiographer. Your
assigned responsibilities in regards to dental imaging may include - education of
patients about dental imaging.
To avoid occupational exposure to x-radiation, the dental radiographer must always - -
maintain an adequate distance
- have proper positioning
- have proper shielding.
- avoid the primary beam.
The nucleus of an atom contains - protons and neutrons.
Which of the following statements is true of ionization? - - An atom that gains an
electron will have a negative charge
- An atom that loses an electron will have a positive charge.
(1) Radiation is the emission and propagation of energy through space or a substance
in the form of waves or particles. (2) Radioactivity can be defined as the process by
which certain unstable atoms or elements undergo spontaneous disintegration, or
decay, in an effort to attain a more balanced nuclear state. - Both statements are true.
,Electromagnetic radiations - include x-rays and visible light.
Which of the following forms of electromagnetic radiation are capable of ionization? - X-
rays
Heat is a byproduct of x-ray production. Which component of the x-ray tubehead
dissipates the heat created by the production of x-rays? - Insulating oil
What is the purpose of the PID? - It aims and shapes the x-ray beam.
Within the x-ray tube, electrons are generated by the - tungsten filament in the cathode.
The purpose of the anode is to - convert electrons into x-ray photons.
In the dental x-ray tube, the number of electrons created is controlled by -
milliamperage.
Thermionic emission of electrons occurs at the - tungsten filament in the cathode.
Approximately what percentage of the kinetic energy of the electrons is converted to x-
rays at the anode? - Less than 1%
The lead collimator - restricts the size of the x-ray beam.
Which form of the x-ray beam is most detrimental to the patient and operator? - Scatter
radiation
(1) X-ray photon production occurs as a result of both general and characteristic
radiation. (2) General radiation accounts for a small number of x-ray photons produced
because it takes high kV to dislodge the electrons from the K shell. - The first statement
is true; the second statement is false.
In dental radiography, the term ________ is used to describe the mean energy or
penetrating ability of the x-ray beam. - quality
Which of the following statements is true of wavelength in reference to radiation? - X-
rays with longer wavelength have less penetrating power.
The kVp represents - the maximum or peak voltage of an alternating current.
Exposure time is measured in - impulses.
The quantity of the x-rays produced is controlled by - milliamperage.
Which of the following changes will increase x-ray beam intensity? - Decreasing the
source-to-film distance
, Aluminum filters - reduce the intensity of the x-ray beam.
You have been using a dental x-ray machine that has a 4-inch PID. Your new machine
has an 8-inch PID. Given that all exposure factors remain the same, according to the
inverse square law, the resultant beam would be ___________ as intense. - one quarter
(1) As kilovoltage, milliamperage, and time increase, x-ray beam intensity increases. (2)
As distance and filtration increase, the intensity of the x-ray beam decreases. - Both
statements are true.
You are going to take dental images on a patient in the OTC clinic. He is larger than
average. What machine setting adjustment should you make prior to taking dental
images? - Increase impulses.
(1) All ionizing radiations cause damage to living tissues. (2) Although very little
radiation is used in dentistry, damage to the cells does occur. - Both statements are
true.
The indirect theory proposes that - toxins are created from the formation of free radicals.
A nonthreshold dose-response curve suggests that - radiation exposure, no matter how
small, causes damage to living tissue.
Which of the following is an example of stochastic effects? - Cancer
Your patient was out in the hot, bright sun yesterday. While in the sun she began
experiencing pain and noticed her skin had turned bright red. Shortly after arriving
home, she began to experience chills, nausea, severe pain, and blistering. Why would
your patient experience the symptoms so quickly? - The latent period was decreased by
the increased dose and dose rate.
___________ refers to the total amount of radiation that is received or absorbed. - Total
dose
Which of the following is associated with long-term radiation effects? - Small amounts of
radiation absorbed over a long period
Which of the following is a sign or symptom of acute radiation syndrome (ARS)? - Hair
loss
Which of the following statements is TRUE of somatic effects of irradiation? - Changes
are not transmitted to future generations.
Which of the following cells would be the most sensitive to x-rays? - Blood
GRADED A+
Rare earth screens - have phosphors that emit green light
Duplicating film - is used to make an identical copy of an intraoral or extraoral
radiograph
Film is best stored in an area that is - cool and dry
An oral examination limits the practitioner to knowledge of what is seen clinically. Dental
images allow the practitioner to see many conditions that are not apparent clinically -
Both statements are true.
Through the use of dental images, the dental radiographer can detect ________ that
cannot be detected clinically. - - diseases
- lesions
- lesions
When dental images are properly prescribed, exposed, and processed, the benefit of
disease detection ____________ the risk of small doses of x-radiation. - far outweighs
A ______________ may be a dental radiographer. - - Dentist
- dental hygienist
-dental assistant
A new patient arrives to your dental office, and you will be the dental radiographer. Your
assigned responsibilities in regards to dental imaging may include - education of
patients about dental imaging.
To avoid occupational exposure to x-radiation, the dental radiographer must always - -
maintain an adequate distance
- have proper positioning
- have proper shielding.
- avoid the primary beam.
The nucleus of an atom contains - protons and neutrons.
Which of the following statements is true of ionization? - - An atom that gains an
electron will have a negative charge
- An atom that loses an electron will have a positive charge.
(1) Radiation is the emission and propagation of energy through space or a substance
in the form of waves or particles. (2) Radioactivity can be defined as the process by
which certain unstable atoms or elements undergo spontaneous disintegration, or
decay, in an effort to attain a more balanced nuclear state. - Both statements are true.
,Electromagnetic radiations - include x-rays and visible light.
Which of the following forms of electromagnetic radiation are capable of ionization? - X-
rays
Heat is a byproduct of x-ray production. Which component of the x-ray tubehead
dissipates the heat created by the production of x-rays? - Insulating oil
What is the purpose of the PID? - It aims and shapes the x-ray beam.
Within the x-ray tube, electrons are generated by the - tungsten filament in the cathode.
The purpose of the anode is to - convert electrons into x-ray photons.
In the dental x-ray tube, the number of electrons created is controlled by -
milliamperage.
Thermionic emission of electrons occurs at the - tungsten filament in the cathode.
Approximately what percentage of the kinetic energy of the electrons is converted to x-
rays at the anode? - Less than 1%
The lead collimator - restricts the size of the x-ray beam.
Which form of the x-ray beam is most detrimental to the patient and operator? - Scatter
radiation
(1) X-ray photon production occurs as a result of both general and characteristic
radiation. (2) General radiation accounts for a small number of x-ray photons produced
because it takes high kV to dislodge the electrons from the K shell. - The first statement
is true; the second statement is false.
In dental radiography, the term ________ is used to describe the mean energy or
penetrating ability of the x-ray beam. - quality
Which of the following statements is true of wavelength in reference to radiation? - X-
rays with longer wavelength have less penetrating power.
The kVp represents - the maximum or peak voltage of an alternating current.
Exposure time is measured in - impulses.
The quantity of the x-rays produced is controlled by - milliamperage.
Which of the following changes will increase x-ray beam intensity? - Decreasing the
source-to-film distance
, Aluminum filters - reduce the intensity of the x-ray beam.
You have been using a dental x-ray machine that has a 4-inch PID. Your new machine
has an 8-inch PID. Given that all exposure factors remain the same, according to the
inverse square law, the resultant beam would be ___________ as intense. - one quarter
(1) As kilovoltage, milliamperage, and time increase, x-ray beam intensity increases. (2)
As distance and filtration increase, the intensity of the x-ray beam decreases. - Both
statements are true.
You are going to take dental images on a patient in the OTC clinic. He is larger than
average. What machine setting adjustment should you make prior to taking dental
images? - Increase impulses.
(1) All ionizing radiations cause damage to living tissues. (2) Although very little
radiation is used in dentistry, damage to the cells does occur. - Both statements are
true.
The indirect theory proposes that - toxins are created from the formation of free radicals.
A nonthreshold dose-response curve suggests that - radiation exposure, no matter how
small, causes damage to living tissue.
Which of the following is an example of stochastic effects? - Cancer
Your patient was out in the hot, bright sun yesterday. While in the sun she began
experiencing pain and noticed her skin had turned bright red. Shortly after arriving
home, she began to experience chills, nausea, severe pain, and blistering. Why would
your patient experience the symptoms so quickly? - The latent period was decreased by
the increased dose and dose rate.
___________ refers to the total amount of radiation that is received or absorbed. - Total
dose
Which of the following is associated with long-term radiation effects? - Small amounts of
radiation absorbed over a long period
Which of the following is a sign or symptom of acute radiation syndrome (ARS)? - Hair
loss
Which of the following statements is TRUE of somatic effects of irradiation? - Changes
are not transmitted to future generations.
Which of the following cells would be the most sensitive to x-rays? - Blood
