NRRPT Practice Exam Questions and Answers Latest
Question 1
Which of the following is incorrectly defined?
Correct Answer
10CFR20, Appendix D, US Postal Service Regional Offices
Question 2
The unit ampere is used to measure __________.
Correct Answer
Current
Question 3
An air sample was collected at 2:00 PM and counted at 5:30 PM on the same day. The counting
results indicated the presence of 4.68E-9 mCi Kr-88. Kr-88 has a half-life of 2.8 hours. What was
the Krypton activity in the sample at the time it was collected?
Correct Answer
1.11E-8 mCi
Question 4
Cells are radiosensitive if they __________.
Correct Answer
are well nourished
Question 5
As u in the equation I=Ioe^-ux is increased
Correct Answer
,photon attenuation is increased
Question 6
Which of the following is not a label used for radioactive shipments?
Correct Answer
Transport Index Label
Question 7
Which of the following instrument types would be used to measure neutron dose rates in the
field?
Correct Answer
Proportional Counter
Question 8
Two of the four basic methods available to reduce external exposure to personnel are:
Correct Answer
reduce the radiation intensity by using shielding and reduce the amount of time of exposure
Question 9
The binding energy per nucleon is the average energy which must be added to remove:
Correct Answer
a nucleon from a nucleus
Question 10
In a proportional counter that is used to measure neutron dose rates, the neutron is absorbed
by the _________in the fill gas. This produces a(n) _________ particle which then causes
ionization within the detector.
,Correct Answer
boron, alpha
Question 11
The exposure rate at one foot from an unshielded Co-60 source containing 1.5 Ci and emitting a
1.17 MeV and 1.33 MeV gamma per disintegration would be approximately:
Correct Answer
22.5 R/hr
Question 12
The most common mechanisms for neutron interaction with matter is
Correct Answer
Elastic scattering
Question 13
Which of the following cells are the most radioresistant?
Correct Answer
Bone
Question 14
A typical use of a pancake Geiger-Mueller instrument is to:
Correct Answer
measure low levels of contamination
Question 15
Which is an aspect associated with the radioactive decay of a specific radionuclide?
, Correct Answer
modes of decay
Question 16
Which group/agency provides recommendations to regulatory agencies?
Correct Answer
National Council on Radiation Protection and Measurement (NCRP)
Question 17
The average dose equivalent to the general population of the U.S. from natural cosmic
background radiation is approximately __________ mrem/year.
Correct Answer
27
Question 18
At what radius would you post a radiation area around an 8 curie Cesium 137 (662 keV photon
energy and a photon yield of 0.85 photons/disintegration) point source?
Correct Answer
74 feet
Question 19
A quality factor relates __________ to __________.
Correct Answer
absorbed dose, dose equivalent
Question 20
Which of the following actions would cause a stop work order to be issued by the RCT?
Question 1
Which of the following is incorrectly defined?
Correct Answer
10CFR20, Appendix D, US Postal Service Regional Offices
Question 2
The unit ampere is used to measure __________.
Correct Answer
Current
Question 3
An air sample was collected at 2:00 PM and counted at 5:30 PM on the same day. The counting
results indicated the presence of 4.68E-9 mCi Kr-88. Kr-88 has a half-life of 2.8 hours. What was
the Krypton activity in the sample at the time it was collected?
Correct Answer
1.11E-8 mCi
Question 4
Cells are radiosensitive if they __________.
Correct Answer
are well nourished
Question 5
As u in the equation I=Ioe^-ux is increased
Correct Answer
,photon attenuation is increased
Question 6
Which of the following is not a label used for radioactive shipments?
Correct Answer
Transport Index Label
Question 7
Which of the following instrument types would be used to measure neutron dose rates in the
field?
Correct Answer
Proportional Counter
Question 8
Two of the four basic methods available to reduce external exposure to personnel are:
Correct Answer
reduce the radiation intensity by using shielding and reduce the amount of time of exposure
Question 9
The binding energy per nucleon is the average energy which must be added to remove:
Correct Answer
a nucleon from a nucleus
Question 10
In a proportional counter that is used to measure neutron dose rates, the neutron is absorbed
by the _________in the fill gas. This produces a(n) _________ particle which then causes
ionization within the detector.
,Correct Answer
boron, alpha
Question 11
The exposure rate at one foot from an unshielded Co-60 source containing 1.5 Ci and emitting a
1.17 MeV and 1.33 MeV gamma per disintegration would be approximately:
Correct Answer
22.5 R/hr
Question 12
The most common mechanisms for neutron interaction with matter is
Correct Answer
Elastic scattering
Question 13
Which of the following cells are the most radioresistant?
Correct Answer
Bone
Question 14
A typical use of a pancake Geiger-Mueller instrument is to:
Correct Answer
measure low levels of contamination
Question 15
Which is an aspect associated with the radioactive decay of a specific radionuclide?
, Correct Answer
modes of decay
Question 16
Which group/agency provides recommendations to regulatory agencies?
Correct Answer
National Council on Radiation Protection and Measurement (NCRP)
Question 17
The average dose equivalent to the general population of the U.S. from natural cosmic
background radiation is approximately __________ mrem/year.
Correct Answer
27
Question 18
At what radius would you post a radiation area around an 8 curie Cesium 137 (662 keV photon
energy and a photon yield of 0.85 photons/disintegration) point source?
Correct Answer
74 feet
Question 19
A quality factor relates __________ to __________.
Correct Answer
absorbed dose, dose equivalent
Question 20
Which of the following actions would cause a stop work order to be issued by the RCT?
