NRRPT Emergency Response and Decontamination 4 — Questions and Answers
Question 1: When establishing an emergency decontamination corridor, water runoff control is important primarily to prevent:
- Slipping hazards for emergency responders
- Spread of radioactive contamination to uncontrolled areas (Correct answer)
- Interference with dosimetry equipment calibration
- Reduction in decontamination efficiency
Correct answer: Spread of radioactive contamination to uncontrolled areas
Uncontrolled runoff can transport radioactive material beyond the contamination zone, expanding the contaminated area.
Question 2: Which of the following best describes a 'dirty bomb' (RDD) from a radiation protection standpoint?
- A nuclear weapon with reduced yield designed to minimize blast effects
- A conventional explosive combined with radioactive material designed to disperse contamination (Correct answer)
- A radiological source placed in a populated area without explosion
- A device that causes a criticality accident in a public space
Correct answer: A conventional explosive combined with radioactive material designed to disperse contamination
An RDD uses conventional explosives to disperse radioactive material; its primary effect is contamination and psychological impact, not nuclear yield.
Question 3: Potassium iodide (KI) administration in a radiological emergency protects which organ by what mechanism?
- Bone marrow, by competing with radioactive strontium for uptake
- Thyroid, by saturating iodine uptake to block radioiodine absorption (Correct answer)
- Kidneys, by chelating uranium and other heavy radionuclides
- Lungs, by coating airways to reduce inhalation of radioactive particles
Correct answer: Thyroid, by saturating iodine uptake to block radioiodine absorption
KI saturates thyroid iodine receptors with stable iodine, preventing uptake of inhaled or ingested radioactive iodine isotopes.
Question 4: In the Incident Command System (ICS) used during radiological emergencies, the Radiation Protection Officer typically reports to which position?
- Operations Section Chief
- Safety Officer (Correct answer)
- Logistics Section Chief
- Finance/Administration Section Chief
Correct answer: Safety Officer
The Radiation Protection Officer functions as a technical specialist and typically supports the Safety Officer in the ICS structure.
Question 5: A nuclear power plant declares a 'General Emergency.' What immediate protective action recommendation is typically made for the public within 2 miles?
- No action required; monitor official notifications
- Shelter-in-place with windows and doors closed
- Evacuate immediately (Correct answer)
- Take potassium iodide tablets only
Correct answer: Evacuate immediately
A General Emergency implies imminent or actual substantial release; immediate evacuation within 2 miles (the inner EPZ) is the standard initial protective action.
Question 6: What is the proper sequence for emergency responders donning Level C personal protective equipment for radiological response?
- Coveralls → gloves → boot covers → half-face respirator → tape seams (Correct answer)
- Half-face respirator → coveralls → gloves → boot covers → tape seams
- Boot covers → coveralls → half-face respirator → gloves → tape seams
- Tape seams → coveralls → boot covers → gloves → half-face respirator
Correct answer: Coveralls → gloves → boot covers → half-face respirator → tape seams
Donning sequence proceeds from body suit to extremity protection to respiratory protection, then sealing — ensuring no gaps are created after sealing.
Question 7: After a radiological dispersal event, surface contamination levels are measured using a pancake probe GM detector. A reading of 10,000 cpm above background most accurately indicates:
- A dose rate of exactly 10 mSv/hr at that surface
- Significant surface contamination requiring further characterization and decontamination (Correct answer)
- Criticality conditions are imminent
- Background radiation levels are doubled
Correct answer: Significant surface contamination requiring further characterization and decontamination
CPM readings indicate contamination presence and magnitude but cannot be directly converted to dose rate without knowing the nuclide and detector efficiency.
NRRPT Emergency Response and Decontamination 4
When establishing an emergency decontamination corridor, water runoff control is important primarily to prevent: