NRRPT Exam Questions and Correct
Answers Top Rated Latest Version 2026
Question>> 1
Question>> Number: 809 Applied Radiation Protection
Reactor chemistry samples are often treated with nitric acid to:
A) remove interference from volatiles.
B) preserve the sample for future analysis.
C) destroy organics.
D) prevent cross-contamination.
E) aid isotopic separation.
Correct Answer >>
The Correct Answer >> is: C
The nitric acid helps metals in the sample to remain in solution for analysis at a later date.
Question>> 2
Question>> Number: 310
Fundamentals of Radiation Protection
Rn-220 is a member of which of the following decay series?
A) Uranium
B) Thorium
,C) Actinium
D) Neptunium
E) Radium
Correct Answer >>
The Correct Answer >> is: B
Thorium is the 4n series. The mass number 220 is divisible evenly by 4. ( = 55, no
remainder)
Question>> 3
Question>> Number: 695 Detection and Measurement
The best way to determine if small amounts of particulate radioactivity are in a water sample is
to:
A) use an HPGe detector with a small vial of water centered on top of it.
B) place a drop or two of water inside an LSC vial and count using an LSC.
C) evaporate a large volume of water and count the residue.
D) place a GM detector next to a large container of the water.
E) ue a ZnS detector .
Correct Answer >>
The Correct Answer >> is: C
Evaporating the sample will concentrate the particulate, so it may be more easily detected.
Question>> 4
Question>> Number: 208
Fundamentals of Radiation Protection
,For an isotope having an allowed concentration of 1 x 10 -5 µCi /cc, what is the minimum
discharge time to not exceed the concentration when 1.5 curies of activity are discharged into a
stream having a flow rate of 140,000 gallons/hour? (1 gallon = 3785.6 cc).
A) 1.5 hours
B) 10.7 hours
C) 140 hours
D) 283 hours
E) 1072 horus
Correct Answer >>
The Correct Answer >> is: D
Look at units given and units in the answer to determine how to attack this problem. We are
given allowable µCi/cc, total radioactivity to be released in Ci, and discharge rate in gal/hr. If we
set up the equation to divide µCi/cc/hr into
µCi/cc, we will be left with units of hours, which is the unit that the answer is expressed in.
Therefore:
[(1.5 Ci 1 x 10 6 µCi/Ci)/(140,000gal 3785.6 cc/gal)/1hr]/ (1x 10 -5 µCi/cc)
= 283.02 hr
Question>> 5
Question>> Number: 900 Applied Radiation Protection
The effectiveness of radiation therapy can be increased by:
A) heat.
B) chemicals.
C) type of radiation.
D) dose rate or dose fractionation.
, E) All of the above
Correct Answer >>
The Correct Answer >> is: E
All the listed factors affect the way target cells react to ionizing radiation.
Question>> 6
Question>> Number: 718 Applied Radiation Protection
The basic physical methods applied to protection against external radiation hazards are:
A) film badges and dosimeters.
B) protective clothing.
C) time, distance, and shielding.
D) whole body counting and bioassay.
E) G-M survey meters.
Correct Answer >>
The Correct Answer >> is: C
Decreasing time and increasing distance and shielding are fundamental principles of applied
radiation protection.
Question>> 7
Question>> Number: 872 Applied Radiation Protection
The Code of Federal Regulations, 40 CFR 190, requires that nuclear power plants maintain the
dose to the maximally exposed member of the public to less than:
A) 1 mSv/yr.
B) 0.5 mSv/yr.
C) 0.1 mSv/yr.
D) 0.25 mSv/yr.
Answers Top Rated Latest Version 2026
Question>> 1
Question>> Number: 809 Applied Radiation Protection
Reactor chemistry samples are often treated with nitric acid to:
A) remove interference from volatiles.
B) preserve the sample for future analysis.
C) destroy organics.
D) prevent cross-contamination.
E) aid isotopic separation.
Correct Answer >>
The Correct Answer >> is: C
The nitric acid helps metals in the sample to remain in solution for analysis at a later date.
Question>> 2
Question>> Number: 310
Fundamentals of Radiation Protection
Rn-220 is a member of which of the following decay series?
A) Uranium
B) Thorium
,C) Actinium
D) Neptunium
E) Radium
Correct Answer >>
The Correct Answer >> is: B
Thorium is the 4n series. The mass number 220 is divisible evenly by 4. ( = 55, no
remainder)
Question>> 3
Question>> Number: 695 Detection and Measurement
The best way to determine if small amounts of particulate radioactivity are in a water sample is
to:
A) use an HPGe detector with a small vial of water centered on top of it.
B) place a drop or two of water inside an LSC vial and count using an LSC.
C) evaporate a large volume of water and count the residue.
D) place a GM detector next to a large container of the water.
E) ue a ZnS detector .
Correct Answer >>
The Correct Answer >> is: C
Evaporating the sample will concentrate the particulate, so it may be more easily detected.
Question>> 4
Question>> Number: 208
Fundamentals of Radiation Protection
,For an isotope having an allowed concentration of 1 x 10 -5 µCi /cc, what is the minimum
discharge time to not exceed the concentration when 1.5 curies of activity are discharged into a
stream having a flow rate of 140,000 gallons/hour? (1 gallon = 3785.6 cc).
A) 1.5 hours
B) 10.7 hours
C) 140 hours
D) 283 hours
E) 1072 horus
Correct Answer >>
The Correct Answer >> is: D
Look at units given and units in the answer to determine how to attack this problem. We are
given allowable µCi/cc, total radioactivity to be released in Ci, and discharge rate in gal/hr. If we
set up the equation to divide µCi/cc/hr into
µCi/cc, we will be left with units of hours, which is the unit that the answer is expressed in.
Therefore:
[(1.5 Ci 1 x 10 6 µCi/Ci)/(140,000gal 3785.6 cc/gal)/1hr]/ (1x 10 -5 µCi/cc)
= 283.02 hr
Question>> 5
Question>> Number: 900 Applied Radiation Protection
The effectiveness of radiation therapy can be increased by:
A) heat.
B) chemicals.
C) type of radiation.
D) dose rate or dose fractionation.
, E) All of the above
Correct Answer >>
The Correct Answer >> is: E
All the listed factors affect the way target cells react to ionizing radiation.
Question>> 6
Question>> Number: 718 Applied Radiation Protection
The basic physical methods applied to protection against external radiation hazards are:
A) film badges and dosimeters.
B) protective clothing.
C) time, distance, and shielding.
D) whole body counting and bioassay.
E) G-M survey meters.
Correct Answer >>
The Correct Answer >> is: C
Decreasing time and increasing distance and shielding are fundamental principles of applied
radiation protection.
Question>> 7
Question>> Number: 872 Applied Radiation Protection
The Code of Federal Regulations, 40 CFR 190, requires that nuclear power plants maintain the
dose to the maximally exposed member of the public to less than:
A) 1 mSv/yr.
B) 0.5 mSv/yr.
C) 0.1 mSv/yr.
D) 0.25 mSv/yr.
