A potentially concussive event is defined by presence within how many meters of a blast?

• A. 10 meters
• B. 50 meters
• C. 100 meters
• D. 200 meters

Answer: (B)

Understanding blast exposure and concussion risk zones: A potentially concussive event is defined by being within 50 meters of the blast. The blast overpressure and wind effects are strongest near the detonation, so within this radius the likelihood of a concussion from the primary blast wave is significant, even if there are no penetrating injuries. This threshold helps field medics quickly identify who may have sustained a concussion risk and needs immediate neuro assessment and monitoring. Distances closer than 50 meters carry even higher risk, while those further away (around 100–200 meters) are less likely to involve concussion from the blast wave, though other injuries from debris or secondary effects can still occur.