NRRPT Exam Prep Questions and Correct
Answers
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)
Page 1 of 558
,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) use a ZnS detector .
Correct Answer
The correct answer is: C
Evaporating the sample will concentrate the particulate, so it may be more easily
detected.
Page 2 of 558
,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.
Page 3 of 558
, 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.
E) 5 mSv/yr.
Correct Answer
The correct answer is: D
This limit, promulgated by the EPA, applies to allowable dose to the public from
decommissioned facilities. 40 CFR Part 190
Page 4 of 558
Answers
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)
Page 1 of 558
,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) use a ZnS detector .
Correct Answer
The correct answer is: C
Evaporating the sample will concentrate the particulate, so it may be more easily
detected.
Page 2 of 558
,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.
Page 3 of 558
, 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.
E) 5 mSv/yr.
Correct Answer
The correct answer is: D
This limit, promulgated by the EPA, applies to allowable dose to the public from
decommissioned facilities. 40 CFR Part 190
Page 4 of 558
