RADIATION PROTECTION AND QUALITY
ASSURANCE MOCK EXAM QUESTIONS
WITH COMPLETE ANSWERS
In the radiographic kilovoltage range, which of the following structures will undergo the
most photoelectric absorption?
A: Air cavities
B: Compact bone
C: Fat
D: Soft tissue
E: Muscle tissue - Answer-B: Compact bone
In which of the following x-ray interactions with matter is the energy of the incident
Photon partially absorbed?
A: Compton
B: Photoelectric
C: Coherent
D: Pair production - Answer-A: Compton
Which statement is not true about photon interactions?
A: Coherent Scatter does not involve energy transfer
B: Photoelectric effect involves the ejection of atomic electrons
C: Compton Scattering involves the interaction of valence electrons
D: Pair production involves the creation of an electron positron pair
E: None of the above - Answer-A: Coherent Scatter does not involve energy transfer
The emission of a photoelectron is always followed by further radiation because?
A: The photoelectron eventually annihilates with a free electron
B: The photoelectron eventually interacts with bound electrons
C: The photoelectron will undergo Compton Scattering as a result of the kinetic energy
to it
D: The emission of a photoelectron opens a vacancy in the atomic shell
E: None of the above - Answer-D: The emission of a photoelectron opens a vacancy in
the atomic shell
Compton scattering results in the ejection of an electron and...
A: A scattered Photon with a longer wavelength than the incident Photon
B: A scattered Photon with a shorter wavelength than the incident Photon
C: A scattered Photon the same wavelength as the incident Photon
D: An equal sharing of the photon energy by the electron and recoil nucleus
E: None of the above - Answer-A: A scattered Photon with a longer wavelength than the
incident Photon
,A 70 keV photon is incident on to an atom and an electron is injected with 40 keV of
kinetic energy. Which of the following is not true if the binding energy of that electron
was 30 keV?
A: This is a photon absorption interaction
B: A 30 keV photon will be emitted
C: Characteristic radiation may be emitted
D: Ionization has taken place
E: None of the above - Answer-B: A 30 keV photon will be emitted
When electrons strive to fill a vacant shell and give off photons in the process it is
known as:
A: Pair production
B: Coherent cascade
C: Photodisintegration
D: Characteristic cascade
E: Direct Transmission - Answer-D: Characteristic cascade
The filtration provided by the tube window and collimator mirror is referred to as:
A: Added Filtration
B: Total Filtration
C: Equivalent filtration
D: Inherent Filtration - Answer-D: Inherent filtration
In comparison to the average wavelength of the primary beam, the wavelength of
scattered radiation is:
A: Shorter
B: Longer
C: Of greater Intensity
D: More irregular - Answer-B: Longer
What term is used to describe the amount of time that a radiation beam is directed at a
specific barrier?
A: Linear energy transfer
B: Attenuation Factor
C: Workload factor
D: Use factor - Answer-D: Use factor
The dose limit for the lens of the eye for an occupational worker is?
A: 50 mSv/Year
B: 150 mSv/Year
C: 100 mSv/Year
D: 5 mSv/Year - Answer-B: 150 mSv/Year (15 Rem)
Exposure: C/kg and Roentgen
Activity: Becquerel and Curie
Absorbed dose: Gray and Rad
, Dose equivalent: Sievert and Rem
Naturally occurring radiation in the body is primarily from:
A: Iridium-192
B: Phosphorus-32
C: Iodine-125
D: Potassium-40 - Answer-D: Potassium-40
An unstoppable atom giving the same atomic number, but different number of neutrons
in the nucleus is a:
A: Isotone
B: Isotope
C: Free Radical
D: Isomer - Answer-B: Isotope
Which is not a personal monitoring device?
A: TLD
B: Film dosimeter
C: Cutie pie
D: Pocket ionization chamber - Answer-C: Cutie pie
What is the recommended total dose limit to a fetus?
A: .5 Rem/year
B: .5 Rem/gestational period
C: .05 Rem/year
D: .1 Rem/year - Answer-B: .5 Rem/gestational period
Acute radiation effects include:
1: Diarrhea
2: Erythema
3: Cataracts
4: Epilation
A: 1,3,4
B: 2,3,4
C: 1,2,3
D: 1,2,4 - Answer-D: 1,2,4
Diarrhea, Erythema, Epilation
Which of the following Photon interactions is independent of the atomic number and is
dependent on the electron density of a material?
A: Para production
B: Compton
C: Photoelectric
D: Photodisintegration - Answer-D: Photodisintegration
ASSURANCE MOCK EXAM QUESTIONS
WITH COMPLETE ANSWERS
In the radiographic kilovoltage range, which of the following structures will undergo the
most photoelectric absorption?
A: Air cavities
B: Compact bone
C: Fat
D: Soft tissue
E: Muscle tissue - Answer-B: Compact bone
In which of the following x-ray interactions with matter is the energy of the incident
Photon partially absorbed?
A: Compton
B: Photoelectric
C: Coherent
D: Pair production - Answer-A: Compton
Which statement is not true about photon interactions?
A: Coherent Scatter does not involve energy transfer
B: Photoelectric effect involves the ejection of atomic electrons
C: Compton Scattering involves the interaction of valence electrons
D: Pair production involves the creation of an electron positron pair
E: None of the above - Answer-A: Coherent Scatter does not involve energy transfer
The emission of a photoelectron is always followed by further radiation because?
A: The photoelectron eventually annihilates with a free electron
B: The photoelectron eventually interacts with bound electrons
C: The photoelectron will undergo Compton Scattering as a result of the kinetic energy
to it
D: The emission of a photoelectron opens a vacancy in the atomic shell
E: None of the above - Answer-D: The emission of a photoelectron opens a vacancy in
the atomic shell
Compton scattering results in the ejection of an electron and...
A: A scattered Photon with a longer wavelength than the incident Photon
B: A scattered Photon with a shorter wavelength than the incident Photon
C: A scattered Photon the same wavelength as the incident Photon
D: An equal sharing of the photon energy by the electron and recoil nucleus
E: None of the above - Answer-A: A scattered Photon with a longer wavelength than the
incident Photon
,A 70 keV photon is incident on to an atom and an electron is injected with 40 keV of
kinetic energy. Which of the following is not true if the binding energy of that electron
was 30 keV?
A: This is a photon absorption interaction
B: A 30 keV photon will be emitted
C: Characteristic radiation may be emitted
D: Ionization has taken place
E: None of the above - Answer-B: A 30 keV photon will be emitted
When electrons strive to fill a vacant shell and give off photons in the process it is
known as:
A: Pair production
B: Coherent cascade
C: Photodisintegration
D: Characteristic cascade
E: Direct Transmission - Answer-D: Characteristic cascade
The filtration provided by the tube window and collimator mirror is referred to as:
A: Added Filtration
B: Total Filtration
C: Equivalent filtration
D: Inherent Filtration - Answer-D: Inherent filtration
In comparison to the average wavelength of the primary beam, the wavelength of
scattered radiation is:
A: Shorter
B: Longer
C: Of greater Intensity
D: More irregular - Answer-B: Longer
What term is used to describe the amount of time that a radiation beam is directed at a
specific barrier?
A: Linear energy transfer
B: Attenuation Factor
C: Workload factor
D: Use factor - Answer-D: Use factor
The dose limit for the lens of the eye for an occupational worker is?
A: 50 mSv/Year
B: 150 mSv/Year
C: 100 mSv/Year
D: 5 mSv/Year - Answer-B: 150 mSv/Year (15 Rem)
Exposure: C/kg and Roentgen
Activity: Becquerel and Curie
Absorbed dose: Gray and Rad
, Dose equivalent: Sievert and Rem
Naturally occurring radiation in the body is primarily from:
A: Iridium-192
B: Phosphorus-32
C: Iodine-125
D: Potassium-40 - Answer-D: Potassium-40
An unstoppable atom giving the same atomic number, but different number of neutrons
in the nucleus is a:
A: Isotone
B: Isotope
C: Free Radical
D: Isomer - Answer-B: Isotope
Which is not a personal monitoring device?
A: TLD
B: Film dosimeter
C: Cutie pie
D: Pocket ionization chamber - Answer-C: Cutie pie
What is the recommended total dose limit to a fetus?
A: .5 Rem/year
B: .5 Rem/gestational period
C: .05 Rem/year
D: .1 Rem/year - Answer-B: .5 Rem/gestational period
Acute radiation effects include:
1: Diarrhea
2: Erythema
3: Cataracts
4: Epilation
A: 1,3,4
B: 2,3,4
C: 1,2,3
D: 1,2,4 - Answer-D: 1,2,4
Diarrhea, Erythema, Epilation
Which of the following Photon interactions is independent of the atomic number and is
dependent on the electron density of a material?
A: Para production
B: Compton
C: Photoelectric
D: Photodisintegration - Answer-D: Photodisintegration
