NRRPT, NRRPT EXAM REVIEW, NRRPT, NRRPT STUDY
GUIDE EXAM LATEST 2026/2027 UPDATED VERIFIED
QUESTIONS AND SOLUTIONS A+ PASS
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ACCURATE QUESTIONS &ANSWERS. EXCELLENCE
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Effects of acute radiation exposure on the central nervous system can be
observed at doses of: Answer: 1000 rads.
Genetic effects produced by radiation in males are dependent on:
1. State of germ cell development
2. LET of the radiation
3. Interval between the exposure and conception Answer: 1,2,3
What is the "threshold" of radiation dose effects? Answer: The dose of radiation below which
there are no effects whatsoever on the body
The three naturally-occurring radioactive decay chains are: Answer: Thorium, Actinium,
Uranium
Which radionuclide is NOT a naturally occurring radionuclide? Answer: Cs-137
The dose equivalent to the U.S. population from all man-made sources of
radiation is given by the NCRP as approximately Answer: 60 mrem/year
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
,Most of the dose received by man from man-made sources of radiation is due to: Answer:
medical applications of radiation and radioactive materials.
One Roentgen is equal to: Answer: 2.58 x 10-4 coulomb/kg air.
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). Answer: 283 hours
The energy absorbed by 1 gram of air exposed to 1 Roentgen of gamma rays is equivalent to:
Answer: 87 ergs.
All of the following statements about atomic structure are true EXCEPT: Answer: Electrons,
protons, and neutrons are all of about equal mass
The radius of the nucleus of an atom as compared to the atom as a whole is: Answer: some
10,000 times smaller.
Isotopes are: Answer: forms of the same element containing different numbers of neutrons.
What are isotones? Answer: nuclides with the same number of neutrons
Emission of a negatively charged beta particle results from the transformation of: Answer: a
neutron into a proton.
Following electron capture, the following processes may occur:
1. Z increases by 1
2. Z decreases by 1
3. Characteristic x-rays are emitted
4. Auger electron emission Answer: 2,3,4
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
, A technician surveys a shielded pure beta-emitting source and obtains a measurement of 0.2
R/hr. If all beta particles are shielded, the reading is caused by: Answer: Bremsstrahlung.
The dose to tissue from 6 MeV neutrons is delivered primarily by: Answer: recoil protons.
In the interaction of thermal neutrons with tissue, the major dose is from: Answer: the H-
1(n,gamma)H-2 reaction
The average energy required to produce an ion pair in air by x or gamma radiation is which of
the following? Answer: 33.7 eV
Which of the organ systems is the MOST radiosensitive Answer: Bone marrow
Which of the following are considered risks of chronic low-level radiation exposure?
1. Sterility
2. Leukemia
3. Cataracts
4. Skin erythema Answer: 2
Which radionuclide is a bone seeker? Answer: Ca-45
"Below a certain radiation dose, no effects whatsoever occur in the human
body." This statement supports which dose/effect theory? Answer: Threshold
Why are the dose equivalent limits for occupationally exposed persons so
much higher than those set for members of the general public? Answer: The number of
radiation workers is very low compared to the population, so the total risk is very small
3
APPHIA - Crafted with Care and Precision for Academic Excellence.
GUIDE EXAM LATEST 2026/2027 UPDATED VERIFIED
QUESTIONS AND SOLUTIONS A+ PASS
GUARANTEED|COMPLETE STUDY GUIDE WITH 100%
ACCURATE QUESTIONS &ANSWERS. EXCELLENCE
GUARANTEED.
Effects of acute radiation exposure on the central nervous system can be
observed at doses of: Answer: 1000 rads.
Genetic effects produced by radiation in males are dependent on:
1. State of germ cell development
2. LET of the radiation
3. Interval between the exposure and conception Answer: 1,2,3
What is the "threshold" of radiation dose effects? Answer: The dose of radiation below which
there are no effects whatsoever on the body
The three naturally-occurring radioactive decay chains are: Answer: Thorium, Actinium,
Uranium
Which radionuclide is NOT a naturally occurring radionuclide? Answer: Cs-137
The dose equivalent to the U.S. population from all man-made sources of
radiation is given by the NCRP as approximately Answer: 60 mrem/year
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
,Most of the dose received by man from man-made sources of radiation is due to: Answer:
medical applications of radiation and radioactive materials.
One Roentgen is equal to: Answer: 2.58 x 10-4 coulomb/kg air.
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). Answer: 283 hours
The energy absorbed by 1 gram of air exposed to 1 Roentgen of gamma rays is equivalent to:
Answer: 87 ergs.
All of the following statements about atomic structure are true EXCEPT: Answer: Electrons,
protons, and neutrons are all of about equal mass
The radius of the nucleus of an atom as compared to the atom as a whole is: Answer: some
10,000 times smaller.
Isotopes are: Answer: forms of the same element containing different numbers of neutrons.
What are isotones? Answer: nuclides with the same number of neutrons
Emission of a negatively charged beta particle results from the transformation of: Answer: a
neutron into a proton.
Following electron capture, the following processes may occur:
1. Z increases by 1
2. Z decreases by 1
3. Characteristic x-rays are emitted
4. Auger electron emission Answer: 2,3,4
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
, A technician surveys a shielded pure beta-emitting source and obtains a measurement of 0.2
R/hr. If all beta particles are shielded, the reading is caused by: Answer: Bremsstrahlung.
The dose to tissue from 6 MeV neutrons is delivered primarily by: Answer: recoil protons.
In the interaction of thermal neutrons with tissue, the major dose is from: Answer: the H-
1(n,gamma)H-2 reaction
The average energy required to produce an ion pair in air by x or gamma radiation is which of
the following? Answer: 33.7 eV
Which of the organ systems is the MOST radiosensitive Answer: Bone marrow
Which of the following are considered risks of chronic low-level radiation exposure?
1. Sterility
2. Leukemia
3. Cataracts
4. Skin erythema Answer: 2
Which radionuclide is a bone seeker? Answer: Ca-45
"Below a certain radiation dose, no effects whatsoever occur in the human
body." This statement supports which dose/effect theory? Answer: Threshold
Why are the dose equivalent limits for occupationally exposed persons so
much higher than those set for members of the general public? Answer: The number of
radiation workers is very low compared to the population, so the total risk is very small
3
APPHIA - Crafted with Care and Precision for Academic Excellence.
