RADT 1200 FINAL REVIEW EXAM
QUESTIONS WITH 100% CORRECT
ANSWERS LATEST VERSION 2025/2026.
The first decay product of radium is - ANS Radon
Diagnostic efficacy includes
1. determining if an imaging procedure is justified.
2. obtaining images with minimal radiation exposure.
3. adhering to radiation safety guidelines.
4. revealing the presence or absence of disease in a patient. - ANS 1, 2, 3, and 4
Through which of the following routes can radon enter houses?
1. Crawl spaces under living areas
2. Floor drains and sump pumps
3. Porous cement block foundations - ANS 1, 2, and 3
Although coherent scattering is most likely to occur ____________, some of this unmodified
scattering occurs throughout the diagnostic range and may result in small amounts of
radiographic fog. - ANS at less than 10 keV
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Which of the following interactions results in the conversion of matter into energy? -
ANS Annihilation reaction
Terrestrial radiation includes which of the following sources? - ANS Long-lived radioactive
elements such as uranium-238, radium-226, and thorium-232 that are present in variable
quantities in the crust of the earth
The cardinal principles of radiation protection include which of the following?
1. Time
2. Distance
3. Shielding - ANS 1, 2, and 3
In the electromagnetic spectrum, higher frequencies are associated with - ANS horter
wavelengths and higher energies.
When an inner electron is removed from an atom in a photoelectric interaction, thus causing an
inner-shell vacancy, the energy liberated when this vacancy is filled can be transferred to
another electron of the atom, thereby ejecting that electron, instead of emerging from the
atom as characteristic radiation. What is this electron called? - ANS Auger electron
if ionizing radiation from natural sources grows larger because of accidental or deliberate
human actions such as mining radioactive elements, the sources are termed - ANS enhanced
natural sources.
Which of the following is not another term for coherent scattering? - ANS Characteristic
In a hospital setting, which of the following professionals is expressly charged by the hospital
administration with being directly responsible for the execution, enforcement, and maintenance
of the ALARA program? - ANS Radiation Safety Officer
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Why should the selection of technical exposure factors for all medical imaging procedures
always follow ALARA? - ANS Because radiation-induced cancer does not appear to have a
dose level below which individuals would have no chance of developing this disease.
Of the two sources of ionizing radiation listed below, which source remains fairly constant from
year to year? - ANS natural
The Environmental Protection Agency (EPA) recommends that action be taken to reduce
elevated levels of radon in homes to a concentration less than - ANS 4 pCi/L.
The symbol Z indicates - ANS atomic number of an atom.
if two anatomic structures have the same density and atomic number but one is twice as thick
as the other, the thicker structure will absorb - ANS twice as many x-ray photons
Electromagnetic radiation travels or propagates through space in the form of a wave but can
interact with matter as a particle of energy called a photon. This dual nature is referred to as -
ANS wave-particle duality.
When exposed to high radon levels in the home, which of the following groups of people have
the highest risk of developing lung cancer? - ANS Smokers
A flight on a typical commercial airliner results in an equivalent dose rate of - ANS 0.005 to
0.01 mSv/hr
The probability of occurrence of photoelectric absorption _________ as the energy of the
incident photon decreases and the atomic number of the irradiated atoms _________. -
ANS increases markedly; increases
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Which of the following interactions between x-ray photons with matter involve a matter-
antimatter annihilation reaction? - ANS Pair production
The mass of an alpha particle is approximately - ANS .four times the mass of a hydrogen atom
and a positive charge twice that of an electron.
Consequences of ionization in human cells include1. creation of unstable atoms.2. production of
free electrons.3. creation of highly reactive free radicals capable of producing substances
poisonous to the cell.4. creation of new biologic molecules detrimental to the living cell.5. injury
to the cell that may manifest itself as abnormal function or loss of function. - ANS 1, 2, 3, 4,
and 5
Which of the following is a method of explaining radiation to the public? - ANS BERT
the term as low as reasonable achievable (ALARA) is synonymous with the term -
ANS optimization for radiation protection (ORP).
Typically, people are more willing to accept a risk if they perceive that the potential benefit to
be obtained is - ANS greater than the risk involved.
What is the term for the number of x-rays emitted per inner-shell vacancy during the process of
photoelectric absorption? - ANS Fluorescent yield
Regarding exposure to ionizing radiation, patients who are educated to understand the medical
benefit of an imaging procedure are more likely to - ANS .suppress any radiation phobia and
be willing to assume a small chance of possible biologic damage.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS WITH 100% CORRECT
ANSWERS LATEST VERSION 2025/2026.
The first decay product of radium is - ANS Radon
Diagnostic efficacy includes
1. determining if an imaging procedure is justified.
2. obtaining images with minimal radiation exposure.
3. adhering to radiation safety guidelines.
4. revealing the presence or absence of disease in a patient. - ANS 1, 2, 3, and 4
Through which of the following routes can radon enter houses?
1. Crawl spaces under living areas
2. Floor drains and sump pumps
3. Porous cement block foundations - ANS 1, 2, and 3
Although coherent scattering is most likely to occur ____________, some of this unmodified
scattering occurs throughout the diagnostic range and may result in small amounts of
radiographic fog. - ANS at less than 10 keV
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Which of the following interactions results in the conversion of matter into energy? -
ANS Annihilation reaction
Terrestrial radiation includes which of the following sources? - ANS Long-lived radioactive
elements such as uranium-238, radium-226, and thorium-232 that are present in variable
quantities in the crust of the earth
The cardinal principles of radiation protection include which of the following?
1. Time
2. Distance
3. Shielding - ANS 1, 2, and 3
In the electromagnetic spectrum, higher frequencies are associated with - ANS horter
wavelengths and higher energies.
When an inner electron is removed from an atom in a photoelectric interaction, thus causing an
inner-shell vacancy, the energy liberated when this vacancy is filled can be transferred to
another electron of the atom, thereby ejecting that electron, instead of emerging from the
atom as characteristic radiation. What is this electron called? - ANS Auger electron
if ionizing radiation from natural sources grows larger because of accidental or deliberate
human actions such as mining radioactive elements, the sources are termed - ANS enhanced
natural sources.
Which of the following is not another term for coherent scattering? - ANS Characteristic
In a hospital setting, which of the following professionals is expressly charged by the hospital
administration with being directly responsible for the execution, enforcement, and maintenance
of the ALARA program? - ANS Radiation Safety Officer
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Why should the selection of technical exposure factors for all medical imaging procedures
always follow ALARA? - ANS Because radiation-induced cancer does not appear to have a
dose level below which individuals would have no chance of developing this disease.
Of the two sources of ionizing radiation listed below, which source remains fairly constant from
year to year? - ANS natural
The Environmental Protection Agency (EPA) recommends that action be taken to reduce
elevated levels of radon in homes to a concentration less than - ANS 4 pCi/L.
The symbol Z indicates - ANS atomic number of an atom.
if two anatomic structures have the same density and atomic number but one is twice as thick
as the other, the thicker structure will absorb - ANS twice as many x-ray photons
Electromagnetic radiation travels or propagates through space in the form of a wave but can
interact with matter as a particle of energy called a photon. This dual nature is referred to as -
ANS wave-particle duality.
When exposed to high radon levels in the home, which of the following groups of people have
the highest risk of developing lung cancer? - ANS Smokers
A flight on a typical commercial airliner results in an equivalent dose rate of - ANS 0.005 to
0.01 mSv/hr
The probability of occurrence of photoelectric absorption _________ as the energy of the
incident photon decreases and the atomic number of the irradiated atoms _________. -
ANS increases markedly; increases
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Which of the following interactions between x-ray photons with matter involve a matter-
antimatter annihilation reaction? - ANS Pair production
The mass of an alpha particle is approximately - ANS .four times the mass of a hydrogen atom
and a positive charge twice that of an electron.
Consequences of ionization in human cells include1. creation of unstable atoms.2. production of
free electrons.3. creation of highly reactive free radicals capable of producing substances
poisonous to the cell.4. creation of new biologic molecules detrimental to the living cell.5. injury
to the cell that may manifest itself as abnormal function or loss of function. - ANS 1, 2, 3, 4,
and 5
Which of the following is a method of explaining radiation to the public? - ANS BERT
the term as low as reasonable achievable (ALARA) is synonymous with the term -
ANS optimization for radiation protection (ORP).
Typically, people are more willing to accept a risk if they perceive that the potential benefit to
be obtained is - ANS greater than the risk involved.
What is the term for the number of x-rays emitted per inner-shell vacancy during the process of
photoelectric absorption? - ANS Fluorescent yield
Regarding exposure to ionizing radiation, patients who are educated to understand the medical
benefit of an imaging procedure are more likely to - ANS .suppress any radiation phobia and
be willing to assume a small chance of possible biologic damage.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
