TCDHA RAD MIDTERM EXAM | QUESTIONS AND ANSWERS |
VERIFIED EXAM ALREADY GRADED A+ | LATEST EXAM UPDATE
A form of energy carried by waves or streams of particles is defined as... -
CORRECT ANSWER - Radiation
The x-ray was discovered by... - CORRECT ANSWER - Wilhelm Roentgen
Who MODIFIED the paralleling technique with the introduction of the long-cone
technique? - CORRECT 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 - CORRECT ANSWER - b. Image Receptor
Which subatomic particle carries a negative electrical charge?
a) A Neutron
b) A Proton
c) An Electron
d) A Nucleon - CORRECT ANSWER - c. An Electron
,What is the binding energy or binding force of an electron is... - CORRECT
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... - CORRECT 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 - CORRECT ANSWER - a. Electrons
What type of radiation includes x-rays and visible light? - CORRECT ANSWER
- Electromagnetic
Approximately what percentage of the kinetic energy of the electrons is converted
to x-rays at the anode? - CORRECT ANSWER - Less than 1%
What restricts the size of the x-ray beam? - CORRECT ANSWER - The Lead
Collimator
Which form of the x-ray beam is more detrimental to the patient and operator? -
CORRECT ANSWER - Scatter Radiation
,What happens with the electrons when the kilovoltage is increased? - CORRECT
ANSWER - The electrons moves from the CATHODE to the ANODE with more
speed
Higher-energy x-ray beam with increased penetrating ability results by... -
CORRECT 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 - CORRECT
ANSWER - c. The first statement is true; the second statement is false
What controls the quantity of x-rays produced? - CORRECT ANSWER -
Milliamperage (mA)
In regard to increasing density: - CORRECT 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. - CORRECT
ANSWER - Inversely; square of the distance
Aluminium filters are used to remove ________ -energy, _________ wavelength
x-rays. - CORRECT 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? - CORRECT
ANSWER - Free radical formation created by the ionization of water may occur.
What is associated with long-term radiation effects? - CORRECT 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 - CORRECT 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 unrelated to dental imaging radiation exposure. - CORRECT
ANSWER - Both statements are TRUE!
The use of F-speed film instead of D-speed film reduces the absorbed dose by
_______% - CORRECT ANSWER - 60%
What should you do prior to taking x-rays to protect your patient from radiation
exposure?
a. Proper film processing
VERIFIED EXAM ALREADY GRADED A+ | LATEST EXAM UPDATE
A form of energy carried by waves or streams of particles is defined as... -
CORRECT ANSWER - Radiation
The x-ray was discovered by... - CORRECT ANSWER - Wilhelm Roentgen
Who MODIFIED the paralleling technique with the introduction of the long-cone
technique? - CORRECT 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 - CORRECT ANSWER - b. Image Receptor
Which subatomic particle carries a negative electrical charge?
a) A Neutron
b) A Proton
c) An Electron
d) A Nucleon - CORRECT ANSWER - c. An Electron
,What is the binding energy or binding force of an electron is... - CORRECT
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... - CORRECT 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 - CORRECT ANSWER - a. Electrons
What type of radiation includes x-rays and visible light? - CORRECT ANSWER
- Electromagnetic
Approximately what percentage of the kinetic energy of the electrons is converted
to x-rays at the anode? - CORRECT ANSWER - Less than 1%
What restricts the size of the x-ray beam? - CORRECT ANSWER - The Lead
Collimator
Which form of the x-ray beam is more detrimental to the patient and operator? -
CORRECT ANSWER - Scatter Radiation
,What happens with the electrons when the kilovoltage is increased? - CORRECT
ANSWER - The electrons moves from the CATHODE to the ANODE with more
speed
Higher-energy x-ray beam with increased penetrating ability results by... -
CORRECT 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 - CORRECT
ANSWER - c. The first statement is true; the second statement is false
What controls the quantity of x-rays produced? - CORRECT ANSWER -
Milliamperage (mA)
In regard to increasing density: - CORRECT 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. - CORRECT
ANSWER - Inversely; square of the distance
Aluminium filters are used to remove ________ -energy, _________ wavelength
x-rays. - CORRECT 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? - CORRECT
ANSWER - Free radical formation created by the ionization of water may occur.
What is associated with long-term radiation effects? - CORRECT 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 - CORRECT 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 unrelated to dental imaging radiation exposure. - CORRECT
ANSWER - Both statements are TRUE!
The use of F-speed film instead of D-speed film reduces the absorbed dose by
_______% - CORRECT ANSWER - 60%
What should you do prior to taking x-rays to protect your patient from radiation
exposure?
a. Proper film processing
