NRRPT, NRRPT Exam Review,
NRRPT, NRRPT Study Guide Exam
Latest 2026/2027 Updated
Verified Questions and Solutions
A+ Pass Guaranteed
Effects of acute radiation exposure on the central nervous system can be
observed at doses of:
- ANS - 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
- ANS - 1,2,3
What is the "threshold" of radiation dose effects?
- ANS - The dose of radiation below which there are no effects whatsoever
on the body
The three naturally-occurring radioactive decay chains are:
- ANS - Thorium, Actinium, Uranium
,Which radionuclide is NOT a naturally occurring radionuclide?
- ANS - Cs-137
The dose equivalent to the U.S. population from all man-made sources of
radiation is given by the NCRP as approximately
- ANS - 60 mrem/year
Most of the dose received by man from man-made sources of radiation is
due to:
- ANS - medical applications of radiation and radioactive materials.
One Roentgen is equal to:
- ANS - 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).
- ANS - 283 hours
The energy absorbed by 1 gram of air exposed to 1 Roentgen of gamma
rays is equivalent to:
- ANS - 87 ergs.
All of the following statements about atomic structure are true EXCEPT:
- ANS - 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:
- ANS - some 10,000 times smaller.
Isotopes are:
- ANS - forms of the same element containing different numbers of
neutrons.
What are isotones?
- ANS - nuclides with the same number of neutrons
Emission of a negatively charged beta particle results from the
transformation of:
- ANS - 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
- ANS - 2,3,4
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:
- ANS - Bremsstrahlung.
, The dose to tissue from 6 MeV neutrons is delivered primarily by:
- ANS - recoil protons.
In the interaction of thermal neutrons with tissue, the major dose is
from:
- ANS - 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?
- ANS - 33.7 eV
Which of the organ systems is the MOST radiosensitive
- ANS - Bone marrow
Which of the following are considered risks of chronic low-level radiation
exposure?
1. Sterility
2. Leukemia
3. Cataracts
4. Skin erythema
- ANS - 2
Which radionuclide is a bone seeker?
- ANS - Ca-45
"Below a certain radiation dose, no effects whatsoever occur in the
human
NRRPT, NRRPT Study Guide Exam
Latest 2026/2027 Updated
Verified Questions and Solutions
A+ Pass Guaranteed
Effects of acute radiation exposure on the central nervous system can be
observed at doses of:
- ANS - 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
- ANS - 1,2,3
What is the "threshold" of radiation dose effects?
- ANS - The dose of radiation below which there are no effects whatsoever
on the body
The three naturally-occurring radioactive decay chains are:
- ANS - Thorium, Actinium, Uranium
,Which radionuclide is NOT a naturally occurring radionuclide?
- ANS - Cs-137
The dose equivalent to the U.S. population from all man-made sources of
radiation is given by the NCRP as approximately
- ANS - 60 mrem/year
Most of the dose received by man from man-made sources of radiation is
due to:
- ANS - medical applications of radiation and radioactive materials.
One Roentgen is equal to:
- ANS - 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).
- ANS - 283 hours
The energy absorbed by 1 gram of air exposed to 1 Roentgen of gamma
rays is equivalent to:
- ANS - 87 ergs.
All of the following statements about atomic structure are true EXCEPT:
- ANS - 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:
- ANS - some 10,000 times smaller.
Isotopes are:
- ANS - forms of the same element containing different numbers of
neutrons.
What are isotones?
- ANS - nuclides with the same number of neutrons
Emission of a negatively charged beta particle results from the
transformation of:
- ANS - 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
- ANS - 2,3,4
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:
- ANS - Bremsstrahlung.
, The dose to tissue from 6 MeV neutrons is delivered primarily by:
- ANS - recoil protons.
In the interaction of thermal neutrons with tissue, the major dose is
from:
- ANS - 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?
- ANS - 33.7 eV
Which of the organ systems is the MOST radiosensitive
- ANS - Bone marrow
Which of the following are considered risks of chronic low-level radiation
exposure?
1. Sterility
2. Leukemia
3. Cataracts
4. Skin erythema
- ANS - 2
Which radionuclide is a bone seeker?
- ANS - Ca-45
"Below a certain radiation dose, no effects whatsoever occur in the
human
