NRRPT Prep Comprehensive Assessment Exam
NRRPT PREP COMPREHENSIVE ASSESSMENT EXAM VERIFIED
QUESTIONS AND ANSWERS 100% CORRECT – LATEST 2025
/2026- GRADE A+ GUARANTEED PASS
What is the protection factor (PF) for a full-face, pressure-demand (positive pressure), SCBA? -
ANSWER-Positive Pressure - 10,000
What is the protection factor (PF) for a full-face, demand (negative pressure during inhalation),
air-line respirator? - ANSWER-Demand - 100
What is the protection factor (PF) for a full-face, continuous-flow, air-line respirator? - ANSWER-
Continuous Flow - 1,000
What is the protection factor (PF) for a half-mask, demand (negative pressure during
inhalation), air-line respirator? - ANSWER-Demand - 10
What is the protection factor (PF) for a half-mask, continuous-flow, air-line respirator? -
ANSWER-Continuous Flow-50
What is the protection factor (PF) for a half-mask, negative pressure, air-purifying respirator? -
ANSWER-Half-Mask-10
What is the protection factor (PF) for a full-face, negative pressure, air-purifying respirator? -
ANSWER-Full Face-100
What is the protection factor (PF) for a supplied air hood respirator? - ANSWER-1,000
1|Page
, NRRPT Prep Comprehensive Assessment Exam
Protective actions for nuclear accidents are grouped into which three time phases? - ANSWER-
Early, Intermediate, and Recovery
The electron volt is a unit of energy equal to what? - ANSWER-1.6E-19 Joules, 1.6 x 10^-19
Joules
During the "early" phase of an accident, what effective dose equivalent should the limit be set
at for emergency responders? - ANSWER-5 rem / 50 mSv
How do you increase X-Ray counts in a scintillation crystal? - ANSWER-Thinning the crystal
Federal regulations governing licensing and radiation safety for industrial radiographic
operations can be found where? - ANSWER-10 CFR 34
What agency approves the design of respiratory protection devices? - ANSWER-NIOSH
What is the quality factor for a thermal neutron? - ANSWER-2
What regulation covers quality factors? - ANSWER-10 CFR 20
What is the FWHM value for a Cs-137 photopeak on a NaI system? - ANSWER-50 keV
The "source" of the majority of radon in the environment is generally from which of the
following decay series? - ANSWER-Uranium
How does Cs-137 decay? - ANSWER-By emitting beta particles of two different energies.
0.51 MeV (95%)
2|Page
, NRRPT Prep Comprehensive Assessment Exam
1.17 MeV (5%)
One RAD is equal to what? - ANSWER-100 ergs/gram
What is the term used to describe a process in which a number of fragments are emitted from
an excited nucleus? - ANSWER-Spallation
It literally means to "break apart".
When must a yellow II label be applied to a shipment? - ANSWER-When surface radiation levels
are greater than 50 mrem/hr or a TI greater than 1.0.
Average energy of a positron emitted during positron decay? - ANSWER-4/10 or 0.4 of the
maximum energy.
1 WLM = ? - ANSWER-1 rem CEDE
Radiation exposure to miners is regulated by? - ANSWER-30 CFR
Maximum dose allowed to miners is? - ANSWER-4 WLM per year
A geiger counter has enough voltage to cause? - ANSWER-Secondary electrons with a long range
avalanche
What type of decay "competes" with positron decay? - ANSWER-Electron capture
A gas-filled detector is collecting 100% of the ion pairs produced. It is said to be operating in
what region? - ANSWER-Ionization
3|Page
, NRRPT Prep Comprehensive Assessment Exam
Which laser wavelength is considered a retina hazard for safety purposes? - ANSWER-400 to
1400 nm
To achieve secular equilibrium, which of the following conditions must be met? - ANSWER-
Parent half-life >>> Daughter half-life
What is the limit for external surface contamination on a DOT package? - ANSWER-22
dpm/cm^2
The threshold limit value (TLV) for exposure to radiation from a microwave oven is? - ANSWER-
10 mW/cm^2
Tissue dose from thermal neutrons occurs principally as a result of? - ANSWER-(n, gamma)
reactions with hydrogen and (n,p) reactions with nitrogen
What are the value(s) for gas amplification factors in ionization chambers? - ANSWER-Equal to 1
What is the clearance time for a particulate traveling through the trachea? - ANSWER-0.1 hour
What is the clearance time for a particulate traveling through the bronchi? - ANSWER-1.0 hour
What is the clearance time for a particulate traveling through the bronchioles? - ANSWER-4.0
hours
What is the clearance time for a particulate traveling through the alveoli? - ANSWER-10 to
1500+ days
4|Page
NRRPT PREP COMPREHENSIVE ASSESSMENT EXAM VERIFIED
QUESTIONS AND ANSWERS 100% CORRECT – LATEST 2025
/2026- GRADE A+ GUARANTEED PASS
What is the protection factor (PF) for a full-face, pressure-demand (positive pressure), SCBA? -
ANSWER-Positive Pressure - 10,000
What is the protection factor (PF) for a full-face, demand (negative pressure during inhalation),
air-line respirator? - ANSWER-Demand - 100
What is the protection factor (PF) for a full-face, continuous-flow, air-line respirator? - ANSWER-
Continuous Flow - 1,000
What is the protection factor (PF) for a half-mask, demand (negative pressure during
inhalation), air-line respirator? - ANSWER-Demand - 10
What is the protection factor (PF) for a half-mask, continuous-flow, air-line respirator? -
ANSWER-Continuous Flow-50
What is the protection factor (PF) for a half-mask, negative pressure, air-purifying respirator? -
ANSWER-Half-Mask-10
What is the protection factor (PF) for a full-face, negative pressure, air-purifying respirator? -
ANSWER-Full Face-100
What is the protection factor (PF) for a supplied air hood respirator? - ANSWER-1,000
1|Page
, NRRPT Prep Comprehensive Assessment Exam
Protective actions for nuclear accidents are grouped into which three time phases? - ANSWER-
Early, Intermediate, and Recovery
The electron volt is a unit of energy equal to what? - ANSWER-1.6E-19 Joules, 1.6 x 10^-19
Joules
During the "early" phase of an accident, what effective dose equivalent should the limit be set
at for emergency responders? - ANSWER-5 rem / 50 mSv
How do you increase X-Ray counts in a scintillation crystal? - ANSWER-Thinning the crystal
Federal regulations governing licensing and radiation safety for industrial radiographic
operations can be found where? - ANSWER-10 CFR 34
What agency approves the design of respiratory protection devices? - ANSWER-NIOSH
What is the quality factor for a thermal neutron? - ANSWER-2
What regulation covers quality factors? - ANSWER-10 CFR 20
What is the FWHM value for a Cs-137 photopeak on a NaI system? - ANSWER-50 keV
The "source" of the majority of radon in the environment is generally from which of the
following decay series? - ANSWER-Uranium
How does Cs-137 decay? - ANSWER-By emitting beta particles of two different energies.
0.51 MeV (95%)
2|Page
, NRRPT Prep Comprehensive Assessment Exam
1.17 MeV (5%)
One RAD is equal to what? - ANSWER-100 ergs/gram
What is the term used to describe a process in which a number of fragments are emitted from
an excited nucleus? - ANSWER-Spallation
It literally means to "break apart".
When must a yellow II label be applied to a shipment? - ANSWER-When surface radiation levels
are greater than 50 mrem/hr or a TI greater than 1.0.
Average energy of a positron emitted during positron decay? - ANSWER-4/10 or 0.4 of the
maximum energy.
1 WLM = ? - ANSWER-1 rem CEDE
Radiation exposure to miners is regulated by? - ANSWER-30 CFR
Maximum dose allowed to miners is? - ANSWER-4 WLM per year
A geiger counter has enough voltage to cause? - ANSWER-Secondary electrons with a long range
avalanche
What type of decay "competes" with positron decay? - ANSWER-Electron capture
A gas-filled detector is collecting 100% of the ion pairs produced. It is said to be operating in
what region? - ANSWER-Ionization
3|Page
, NRRPT Prep Comprehensive Assessment Exam
Which laser wavelength is considered a retina hazard for safety purposes? - ANSWER-400 to
1400 nm
To achieve secular equilibrium, which of the following conditions must be met? - ANSWER-
Parent half-life >>> Daughter half-life
What is the limit for external surface contamination on a DOT package? - ANSWER-22
dpm/cm^2
The threshold limit value (TLV) for exposure to radiation from a microwave oven is? - ANSWER-
10 mW/cm^2
Tissue dose from thermal neutrons occurs principally as a result of? - ANSWER-(n, gamma)
reactions with hydrogen and (n,p) reactions with nitrogen
What are the value(s) for gas amplification factors in ionization chambers? - ANSWER-Equal to 1
What is the clearance time for a particulate traveling through the trachea? - ANSWER-0.1 hour
What is the clearance time for a particulate traveling through the bronchi? - ANSWER-1.0 hour
What is the clearance time for a particulate traveling through the bronchioles? - ANSWER-4.0
hours
What is the clearance time for a particulate traveling through the alveoli? - ANSWER-10 to
1500+ days
4|Page
