Medical Radiography
Radiation Protection in Medical Radiography 9th
Edition 2025/2026 Chapters 1-16 Questions and
Answers Complete Study Material with Solutions
_____________________________________________________________________________________
Which of the following sources of radiation is manmade?
1. Atmospheric fallout from nuclear weapons testing
2. Cosmic radiation from the sun and beyond the solar system
3. Nuclear power plant accidents as a consequence of natural disasters
a.
1 and 2 only
b.
1 and 3 only
c.
2 and 3 only
d.
1, 2, and 3
➢ ANS: B
What is the latent period for most radiation-induced cancers?
a.
1 year
b.
5 years
c.
7 years
d.
15 years or more
➢ ANS: D
Of the two sources of ionizing radiation listed below, which source remains fairly constant from year
to year?
a.
Manmade
b.
Natural
➢ ANS: B
,Particles associated with electromagnetic radiation that have neither mass nor electric charge are
a.
ions.
b.
negatrons.
c.
positrons.
d.
x-ray photons.
➢ ANS: D
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.
a.
at less than 10 keV
b.
between 30 keV and 60 keV
c.
between 60 keV and 90 keV
d.
above 100 keV
➢ ANS: A
Which of the following is not a type of interaction between x-radiation and biologic matter?
a.
Compton scattering
b.
Bremsstrahlung
c.
Pair production
d.
Photoelectric absorption
➢ ANS: B
The symbol Z indicates
a.
atomic number of an atom.
b.
atomic weight of an atom.
c.
fluorescent yield.
d.
the number of vacancies in an atomic shell.
, ➢ ANS: A
In photoelectric absorption to dislodge an inner-shell electron from its atomic orbit, the incoming x-
ray photon must be able to transfer a quantity of energy
a.
less than the energy that holds the atom together.
b.
10 times as great as the energy that holds the atom together.
c.
as large as or larger than the amount of energy that holds the electron in its orbit.
d.
equal to or greater than 1.022 MeV, regardless of the energy that holds the electron in its orbit.
➢ ANS: C
Which of the following interactions between x-ray photons with matter involve a matter-antimatter
annihilation reaction?
a.
Compton scattering
b.
Coherent scattering
c.
Pair production
d.
Photoelectric absorption
➢ ANS: C
The probability of occurrence of photoelectric absorption _________ as the energy of the incident
photon decreases and the atomic number of the irradiated atoms _________.
a.
increases markedly; decreases
b.
decreases markedly; increases
c.
increases markedly; increases
d.
stays the same; increases
➢ ANS: C
Which of the following terms refers to the radiation that occurs when an electron spontaneously
drops down from an outer shell of an ionized atom to fill a vacancy in an inner shell of that atom?
a.
Characteristic photon, or characteristic x-ray
b.
Bremsstrahlung
Radiation Protection in Medical Radiography 9th
Edition 2025/2026 Chapters 1-16 Questions and
Answers Complete Study Material with Solutions
_____________________________________________________________________________________
Which of the following sources of radiation is manmade?
1. Atmospheric fallout from nuclear weapons testing
2. Cosmic radiation from the sun and beyond the solar system
3. Nuclear power plant accidents as a consequence of natural disasters
a.
1 and 2 only
b.
1 and 3 only
c.
2 and 3 only
d.
1, 2, and 3
➢ ANS: B
What is the latent period for most radiation-induced cancers?
a.
1 year
b.
5 years
c.
7 years
d.
15 years or more
➢ ANS: D
Of the two sources of ionizing radiation listed below, which source remains fairly constant from year
to year?
a.
Manmade
b.
Natural
➢ ANS: B
,Particles associated with electromagnetic radiation that have neither mass nor electric charge are
a.
ions.
b.
negatrons.
c.
positrons.
d.
x-ray photons.
➢ ANS: D
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.
a.
at less than 10 keV
b.
between 30 keV and 60 keV
c.
between 60 keV and 90 keV
d.
above 100 keV
➢ ANS: A
Which of the following is not a type of interaction between x-radiation and biologic matter?
a.
Compton scattering
b.
Bremsstrahlung
c.
Pair production
d.
Photoelectric absorption
➢ ANS: B
The symbol Z indicates
a.
atomic number of an atom.
b.
atomic weight of an atom.
c.
fluorescent yield.
d.
the number of vacancies in an atomic shell.
, ➢ ANS: A
In photoelectric absorption to dislodge an inner-shell electron from its atomic orbit, the incoming x-
ray photon must be able to transfer a quantity of energy
a.
less than the energy that holds the atom together.
b.
10 times as great as the energy that holds the atom together.
c.
as large as or larger than the amount of energy that holds the electron in its orbit.
d.
equal to or greater than 1.022 MeV, regardless of the energy that holds the electron in its orbit.
➢ ANS: C
Which of the following interactions between x-ray photons with matter involve a matter-antimatter
annihilation reaction?
a.
Compton scattering
b.
Coherent scattering
c.
Pair production
d.
Photoelectric absorption
➢ ANS: C
The probability of occurrence of photoelectric absorption _________ as the energy of the incident
photon decreases and the atomic number of the irradiated atoms _________.
a.
increases markedly; decreases
b.
decreases markedly; increases
c.
increases markedly; increases
d.
stays the same; increases
➢ ANS: C
Which of the following terms refers to the radiation that occurs when an electron spontaneously
drops down from an outer shell of an ionized atom to fill a vacancy in an inner shell of that atom?
a.
Characteristic photon, or characteristic x-ray
b.
Bremsstrahlung
