NRRPT, NRRPT Exam Review, NRRPT,
NRRPT Questions with Detailed Verified
Answers
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
,2 | Page
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
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.
,3 | Page
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
, 4 | Page
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
NRRPT Questions with Detailed Verified
Answers
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
,2 | Page
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
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.
,3 | Page
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
, 4 | Page
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
