RAD TCDHA FINAL EXAM NEWEST 2024 ACTUAL EXAM
180 QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A
A form of energy carried by waves or streams of particles is defined as... - ANSWER:
Radiation
The x-ray was discovered by... - ANSWER: Wilhelm Roentgen
Who MODIFIED the paralleling technique with the introduction of the long-cone
technique? - ANSWER: F. Gordon Fitzgerald
Which of the following would you place in the patient's mouth in order to take
dental x-rays?
a) Image
b) Image Receptor
c) Radiograph
d) Dental radiograph - ANSWER: b. Image Receptor
Which subatomic particle carries a negative electrical charge?
a) A Neutron
b) A Proton
c) An Electron
d) A Nucleon - ANSWER: c. An Electron
What is the binding energy or binding force of an electron is... - ANSWER:
Determined by the distance between the orbiting electrons and the nucleus
A spontaneous emission of radiation from the disintegration of unstable atomic
nuclei is... - ANSWER: Radioactivity
Cathode rays are derived from which of the following types of particulate radiation?
a. Electrons
b. Alpha Particles
c. Protons
d. alpha particle decay - ANSWER: a. Electrons
What type of radiation includes x-rays and visible light? - ANSWER: Electromagnetic
Approximately what percentage of the kinetic energy of the electrons is converted to
x-rays at the anode? - ANSWER: Less than 1%
What restricts the size of the x-ray beam? - ANSWER: The Lead Collimator
, Which form of the x-ray beam is more detrimental to the patient and operator? -
ANSWER: Scatter Radiation
What happens with the electrons when the kilovoltage is increased? - ANSWER: The
electrons moves from the CATHODE to the ANODE with more speed
Higher-energy x-ray beam with increased penetrating ability results by... - ANSWER:
When the kilovolt is increased
(1) Density is the overall darkness or blackness of a dental image. (2) When the
kilovoltage is increased while other exposure factors remain constant, the resultant
image exhibits a decreased density and appears lighter.
a. Both statement are true
b. Both statement are false
c. The first statement is true; the second statement is false - ANSWER: c. The first
statement is true; the second statement is false
What controls the quantity of x-rays produced? - ANSWER: Milliamperage (mA)
In regard to increasing density: - ANSWER: An increase in either kVp or mA will
increase density.
According to inverse square law, the intensity of radiation is ________ proportional
to the _________ from the source of radiation. - ANSWER: Inversely; square of the
distance
Aluminium filters are used to remove ________ -energy, _________ wavelength x-
rays. - ANSWER: Low; Longer
What specific mechanism of radiation injury may result in the formation of hydrogen
peroxide when x-ray energy is absorbed by patients? - ANSWER: Free radical
formation created by the ionization of water may occur.
What is associated with long-term radiation effects? - ANSWER: Small amounts of
radiation absorbed over a long period.
Which of the following is the LEAST sensitive to x-rays?
a. Bone marrow
b. Salivary glands
c. Lymphoid tissue
d. Intestine - ANSWER: b. Salivary Glands
TRUE OR FALSE:
Risk estimates suggest (1) that death is more likely to occur from common activities
than from dental imaging procedures and (2) that caner is much more likely to be
180 QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A
A form of energy carried by waves or streams of particles is defined as... - ANSWER:
Radiation
The x-ray was discovered by... - ANSWER: Wilhelm Roentgen
Who MODIFIED the paralleling technique with the introduction of the long-cone
technique? - ANSWER: F. Gordon Fitzgerald
Which of the following would you place in the patient's mouth in order to take
dental x-rays?
a) Image
b) Image Receptor
c) Radiograph
d) Dental radiograph - ANSWER: b. Image Receptor
Which subatomic particle carries a negative electrical charge?
a) A Neutron
b) A Proton
c) An Electron
d) A Nucleon - ANSWER: c. An Electron
What is the binding energy or binding force of an electron is... - ANSWER:
Determined by the distance between the orbiting electrons and the nucleus
A spontaneous emission of radiation from the disintegration of unstable atomic
nuclei is... - ANSWER: Radioactivity
Cathode rays are derived from which of the following types of particulate radiation?
a. Electrons
b. Alpha Particles
c. Protons
d. alpha particle decay - ANSWER: a. Electrons
What type of radiation includes x-rays and visible light? - ANSWER: Electromagnetic
Approximately what percentage of the kinetic energy of the electrons is converted to
x-rays at the anode? - ANSWER: Less than 1%
What restricts the size of the x-ray beam? - ANSWER: The Lead Collimator
, Which form of the x-ray beam is more detrimental to the patient and operator? -
ANSWER: Scatter Radiation
What happens with the electrons when the kilovoltage is increased? - ANSWER: The
electrons moves from the CATHODE to the ANODE with more speed
Higher-energy x-ray beam with increased penetrating ability results by... - ANSWER:
When the kilovolt is increased
(1) Density is the overall darkness or blackness of a dental image. (2) When the
kilovoltage is increased while other exposure factors remain constant, the resultant
image exhibits a decreased density and appears lighter.
a. Both statement are true
b. Both statement are false
c. The first statement is true; the second statement is false - ANSWER: c. The first
statement is true; the second statement is false
What controls the quantity of x-rays produced? - ANSWER: Milliamperage (mA)
In regard to increasing density: - ANSWER: An increase in either kVp or mA will
increase density.
According to inverse square law, the intensity of radiation is ________ proportional
to the _________ from the source of radiation. - ANSWER: Inversely; square of the
distance
Aluminium filters are used to remove ________ -energy, _________ wavelength x-
rays. - ANSWER: Low; Longer
What specific mechanism of radiation injury may result in the formation of hydrogen
peroxide when x-ray energy is absorbed by patients? - ANSWER: Free radical
formation created by the ionization of water may occur.
What is associated with long-term radiation effects? - ANSWER: Small amounts of
radiation absorbed over a long period.
Which of the following is the LEAST sensitive to x-rays?
a. Bone marrow
b. Salivary glands
c. Lymphoid tissue
d. Intestine - ANSWER: b. Salivary Glands
TRUE OR FALSE:
Risk estimates suggest (1) that death is more likely to occur from common activities
than from dental imaging procedures and (2) that caner is much more likely to be
