NRRPT Emergency Response and Decontamination 2 — Questions and Answers
Question 1: During a radiological emergency, which criterion is used to trigger sheltering-in-place as a protective action?
- Projected dose exceeds the general public annual limit of 1 mSv
- Projected dose to the thyroid exceeds 50 mSv (Correct answer)
- Ambient dose rate exceeds 1 mSv/hr at the site boundary
- Air concentration of radioiodine exceeds DAC by a factor of 10
Correct answer: Projected dose to the thyroid exceeds 50 mSv
EPA Protective Action Guides use a projected thyroid dose of 50 mSv as a key threshold for recommending sheltering.
Question 2: What is the primary purpose of a radiation emergency survey instrument's 'check source' before field deployment?
- To calibrate the instrument to NIST standards
- To verify the instrument responds and is functioning properly (Correct answer)
- To determine the exact efficiency of the detector
- To establish a baseline background reading
Correct answer: To verify the instrument responds and is functioning properly
A check source confirms instrument operability and response, not a full calibration.
Question 3: In a nuclear power plant emergency, what does Emergency Action Level (EAL) classification 'Site Area Emergency' specifically indicate?
- An actual or potential substantial degradation of safety functions with potential for offsite radiological dose (Correct answer)
- Minor equipment malfunctions with no threat to safety systems
- A general emergency with imminent radiological threat to public health
- Loss of offsite power requiring immediate evacuation
Correct answer: An actual or potential substantial degradation of safety functions with potential for offsite radiological dose
Site Area Emergency indicates substantial safety function degradation with potential for, but not imminent, significant offsite dose.
Question 4: When performing skin decontamination on a contaminated worker, which technique should be used first?
- Scrubbing vigorously with a stiff brush and soap
- Gentle washing with mild soap and lukewarm water (Correct answer)
- Applying DTPA chelating agent topically
- Using dry absorbent material to wipe the contamination
Correct answer: Gentle washing with mild soap and lukewarm water
Gentle washing with mild soap and lukewarm water removes contamination while avoiding skin abrasion that could increase absorption.
Question 5: The ALARA principle applied to emergency responders means that doses should be kept as low as reasonably achievable while:
- Never exceeding 5 mSv under any circumstances
- Accomplishing the emergency mission objectives (Correct answer)
- Remaining below occupational worker annual limits
- Avoiding all work in areas above 0.1 mSv/hr
Correct answer: Accomplishing the emergency mission objectives
In emergency response, ALARA is applied within the context of accomplishing life-saving or mission-critical objectives.
Question 6: Which dosimeter type provides the most immediate real-time dose rate information to an emergency responder in the field?
- Thermoluminescent dosimeter (TLD)
- Optically stimulated luminescence dosimeter (OSL)
- Electronic personal dosimeter (EPD) (Correct answer)
- Film badge dosimeter
Correct answer: Electronic personal dosimeter (EPD)
Electronic personal dosimeters provide continuous real-time dose and dose rate readouts, essential for dose management in emergency response.
Question 7: What is the recommended action when a victim arrives at a hospital emergency room with suspected high-level radioactive surface contamination?
- Immediately treat life-threatening injuries before decontamination (Correct answer)
- Delay all treatment until full decontamination is complete
- Transfer the patient to a radiological facility before treatment
- Isolate the patient and wait for a health physicist
Correct answer: Immediately treat life-threatening injuries before decontamination
Life-threatening conditions always take priority; external contamination rarely poses an immediate medical threat to caregivers wearing standard PPE.
NRRPT Emergency Response and Decontamination 2
During a radiological emergency, which criterion is used to trigger sheltering-in-place as a protective action?