NRRPT Emergency Response and Decontamination 3 — Questions and Answers
Question 1: An emergency worker receives a whole-body dose of 250 mSv while performing life-saving actions. According to EPA guidance, this dose is:
- Prohibited under all circumstances for emergency workers
- Acceptable only for life-saving actions when lower doses are not feasible (Correct answer)
- The standard limit for all emergency response activities
- Permissible only for workers over age 45
Correct answer: Acceptable only for life-saving actions when lower doses are not feasible
EPA guidance allows doses up to 250 mSv for life-saving actions, recognizing that the benefit to the public may outweigh individual risk.
Question 2: In radiological triage, what does the term 'expectant' category mean?
- Patients expected to fully recover with minimal treatment
- Patients whose injuries are so severe that survival is unlikely even with treatment (Correct answer)
- Patients awaiting radiological dose assessment
- Pregnant women requiring special monitoring
Correct answer: Patients whose injuries are so severe that survival is unlikely even with treatment
The 'expectant' triage category designates patients unlikely to survive even with aggressive treatment, requiring comfort care only.
Question 3: Which radioactive isotope released in a nuclear reactor accident is of greatest concern for thyroid dose to the general public in the first days post-accident?
- Cs-137
- Sr-90
- I-131 (Correct answer)
- Pu-239
Correct answer: I-131
I-131 concentrates in the thyroid gland and has a relatively short half-life (8 days) making it the primary early thyroid dose concern after reactor accidents.
Question 4: What is the principal radiation hazard associated with a transportation accident involving a Type B radioactive material package?
- Criticality resulting in a prompt nuclear chain reaction
- External radiation from intact or damaged shielding (Correct answer)
- Neutron activation of surrounding materials
- Thermal radiation from decay heat
Correct answer: External radiation from intact or damaged shielding
Type B packages carry high-activity sources; the primary hazard is external gamma/beta radiation, especially if shielding is breached.
Question 5: During decontamination of a wound with embedded radioactive foreign material, what is the recommended initial action?
- Pack the wound with lead shielding material
- Irrigate the wound copiously with sterile saline (Correct answer)
- Apply a tourniquet proximal to the wound
- Leave the wound undisturbed until a radiochemist arrives
Correct answer: Irrigate the wound copiously with sterile saline
Copious irrigation with sterile saline removes loose contamination and reduces internal uptake while awaiting medical and HP guidance.
Question 6: The 'plume exposure pathway' in nuclear emergency planning refers primarily to doses from which source?
- Ingestion of contaminated food and water over months
- Direct irradiation and inhalation during the passage of a radioactive cloud (Correct answer)
- External exposure from ground deposition over years
- Submersion in contaminated water bodies
Correct answer: Direct irradiation and inhalation during the passage of a radioactive cloud
The plume exposure pathway encompasses cloudshine and inhalation exposure during passage of the initial radioactive plume.
Question 7: What radiation protection function does a radiological emergency worker's 'exclusion zone' boundary primarily serve?
- It marks the area where all radiation stops
- It restricts access to control personnel dose and prevent spread of contamination (Correct answer)
- It designates the area requiring full SCBA respiratory protection
- It identifies the zone requiring immediate evacuation of the public
Correct answer: It restricts access to control personnel dose and prevent spread of contamination
The exclusion zone boundary controls access to limit personnel doses and prevent contamination from spreading to unaffected areas.
NRRPT Emergency Response and Decontamination 3
An emergency worker receives a whole-body dose of 250 mSv while performing life-saving actions.
According to EPA guidance, this dose is: