NRRPT Prep Applied Radiation Protection
Exam Questions With Correct Answers
Question Number: 699 Applied Radiation Protection
For calculating dose to an organ from internal sources, the "specific effective energy" of a
radionuclide is BEST described as:
A) the energy given off by the radionuclide per unit of radionuclide activity.
B) the energy absorbed per unit mass of the organ per unit of radionuclide activity.
C) the energy absorbed per unit mass of the organ per disintegration of the radionuclide.
D) the energy given off by the radionuclide per disintegration of the radionuclide.
E) the energy transferred to the organ per unit of radionuclide activity. - CORRECT ANSWER✔✔-
The correct answer is: C
The "SEE" is used in the Medical Internal Radiation Dosimetry (MIRD) dose modeling technique.
Question Number: 700 Applied Radiation Protection
What is the BEST method of disposal of dog carcasses which have been treated with a
radionuclide with a 78-hour half life?
A) Wait 3.25 days and prepare for shipment to a disposal facility or incinerate.
B) Wait 1.625 days and bury.
C) Wait 3.25 days and bury.
D) Wait 32.5 days and prepare for shipment to a disposal facility or incinerate.
E) Wait 32.5 days and bury. - CORRECT ANSWER✔✔-The correct answer is: D
,It is common for radioactive materials licenses to allow the disposal of radioactive materials
after ten half-lives as "clean" materials. In this case, the waste is still biohazardous, so proper
burial or incineration is indicated.
Question Number: 701 Applied Radiation Protection
The major radiological health concern associated with burial of low level solid radioactive waste
is:
A) external radiation at the surface of the burial site.
B) contamination of potable water supplies.
C) airborne radioactivity resulting from contaminated soil.
D) release of volatile radioactive daughter products.
E) contamination of vegetables grown in soil at the site. - CORRECT ANSWER✔✔-The correct
answer is: B
The critical exposure pathway for near-surface disposal of radioactive materials is through
drinking water. Most of the regulations surrounding the burial of radioactive materials, such as
waste classification and stabilization requirements, are designed to prevent contamination of
potable (drinkable) water.
Question Number: 702 Applied Radiation Protection
An adequate Radiation Safety Program is the ultimate responsibility of:
A) the owner of the licensed facility.
B) the operator of the source of radiation.
,C) the Radiation Safety Officer.
D) the line supervisor.
E) the radiation worker. - CORRECT ANSWER✔✔-The correct answer is: A
The radioactive materials license is issued to the owner of the facility. It is the licensee who is
responsible for all aspects of compliance with the license, including the implementation of a
radiation safety program. It is the duty of the RSO to administer the program.
Question Number: 703 Applied Radiation Protection
An x-ray machine is operated in a closed room for several minutes. After the machine is turned
off, how long should the operator wait before entering the room?
A) He may enter immediately.
B) 10 seconds
C) 30 seconds
D) 1 minute
E) 1 hour - CORRECT ANSWER✔✔-The correct answer is: A
When the current to the x-ray tube is turned off, the production of electrons stops. The principle
behind x-ray production in the tube is bremsstrahlung of these electrons with the target
material. When the electron production stops, so does the x-ray production. There is, of course,
no radioactive material in an x-ray machine.
Question Number: 704 Applied Radiation Protection
The exposure rate of the turbine floor of a boiling water reactor plant could be expected to be
decreased to less than 1% at least after shutdown?
, A) five minutes
B) one hour
C) twenty-four hours
D) thirty-six hours
E) forty-eight hours - CORRECT ANSWER✔✔-The correct answer is: A
A good thumb rule for decay is that after seven half-lives, activity is less than 1% of original
activity (it is actually 1/(2)7, or 1/128). Since the nuclide of concern on the turbine floor of a
BWR is N-16 (T 1/2 = 7.1 sec; 6.1,7.1 MeV gamma's), it would take only 49.7 seconds to decay to
less than 1%. N-16 is produced from the (n,p) reaction on O-16 in the reactor coolant.
Question Number: 705 Applied Radiation Protection
The goal and future requirement regarding high level liquid waste is:
A) transformation by irradiation to shorter lived, less toxic materials.
B) vitrification and deep ground burial.
C) use as a heat source.
D) disposal into geological formations.
E) disposal into salt formations. - CORRECT ANSWER✔✔-The correct answer is: B
High level waste, which includes spent reactor fuel and liquid wastes from the solvent extraction
process, requires stabilization and disposal in deep ground geologic repositories. Although
vitrification technology and deep ground burial are practiced in other industrialized nations, the
U.S. lags behind in implementing these methods.
Question Number: 706 Applied Radiation Protection
Exam Questions With Correct Answers
Question Number: 699 Applied Radiation Protection
For calculating dose to an organ from internal sources, the "specific effective energy" of a
radionuclide is BEST described as:
A) the energy given off by the radionuclide per unit of radionuclide activity.
B) the energy absorbed per unit mass of the organ per unit of radionuclide activity.
C) the energy absorbed per unit mass of the organ per disintegration of the radionuclide.
D) the energy given off by the radionuclide per disintegration of the radionuclide.
E) the energy transferred to the organ per unit of radionuclide activity. - CORRECT ANSWER✔✔-
The correct answer is: C
The "SEE" is used in the Medical Internal Radiation Dosimetry (MIRD) dose modeling technique.
Question Number: 700 Applied Radiation Protection
What is the BEST method of disposal of dog carcasses which have been treated with a
radionuclide with a 78-hour half life?
A) Wait 3.25 days and prepare for shipment to a disposal facility or incinerate.
B) Wait 1.625 days and bury.
C) Wait 3.25 days and bury.
D) Wait 32.5 days and prepare for shipment to a disposal facility or incinerate.
E) Wait 32.5 days and bury. - CORRECT ANSWER✔✔-The correct answer is: D
,It is common for radioactive materials licenses to allow the disposal of radioactive materials
after ten half-lives as "clean" materials. In this case, the waste is still biohazardous, so proper
burial or incineration is indicated.
Question Number: 701 Applied Radiation Protection
The major radiological health concern associated with burial of low level solid radioactive waste
is:
A) external radiation at the surface of the burial site.
B) contamination of potable water supplies.
C) airborne radioactivity resulting from contaminated soil.
D) release of volatile radioactive daughter products.
E) contamination of vegetables grown in soil at the site. - CORRECT ANSWER✔✔-The correct
answer is: B
The critical exposure pathway for near-surface disposal of radioactive materials is through
drinking water. Most of the regulations surrounding the burial of radioactive materials, such as
waste classification and stabilization requirements, are designed to prevent contamination of
potable (drinkable) water.
Question Number: 702 Applied Radiation Protection
An adequate Radiation Safety Program is the ultimate responsibility of:
A) the owner of the licensed facility.
B) the operator of the source of radiation.
,C) the Radiation Safety Officer.
D) the line supervisor.
E) the radiation worker. - CORRECT ANSWER✔✔-The correct answer is: A
The radioactive materials license is issued to the owner of the facility. It is the licensee who is
responsible for all aspects of compliance with the license, including the implementation of a
radiation safety program. It is the duty of the RSO to administer the program.
Question Number: 703 Applied Radiation Protection
An x-ray machine is operated in a closed room for several minutes. After the machine is turned
off, how long should the operator wait before entering the room?
A) He may enter immediately.
B) 10 seconds
C) 30 seconds
D) 1 minute
E) 1 hour - CORRECT ANSWER✔✔-The correct answer is: A
When the current to the x-ray tube is turned off, the production of electrons stops. The principle
behind x-ray production in the tube is bremsstrahlung of these electrons with the target
material. When the electron production stops, so does the x-ray production. There is, of course,
no radioactive material in an x-ray machine.
Question Number: 704 Applied Radiation Protection
The exposure rate of the turbine floor of a boiling water reactor plant could be expected to be
decreased to less than 1% at least after shutdown?
, A) five minutes
B) one hour
C) twenty-four hours
D) thirty-six hours
E) forty-eight hours - CORRECT ANSWER✔✔-The correct answer is: A
A good thumb rule for decay is that after seven half-lives, activity is less than 1% of original
activity (it is actually 1/(2)7, or 1/128). Since the nuclide of concern on the turbine floor of a
BWR is N-16 (T 1/2 = 7.1 sec; 6.1,7.1 MeV gamma's), it would take only 49.7 seconds to decay to
less than 1%. N-16 is produced from the (n,p) reaction on O-16 in the reactor coolant.
Question Number: 705 Applied Radiation Protection
The goal and future requirement regarding high level liquid waste is:
A) transformation by irradiation to shorter lived, less toxic materials.
B) vitrification and deep ground burial.
C) use as a heat source.
D) disposal into geological formations.
E) disposal into salt formations. - CORRECT ANSWER✔✔-The correct answer is: B
High level waste, which includes spent reactor fuel and liquid wastes from the solvent extraction
process, requires stabilization and disposal in deep ground geologic repositories. Although
vitrification technology and deep ground burial are practiced in other industrialized nations, the
U.S. lags behind in implementing these methods.
Question Number: 706 Applied Radiation Protection
