What does standoff distance refer to in blast-protection planning?

• A. Distance from device that reduces overpressure impact.
• B. Distance to nearest exit.
• C. Distance to decon point.
• D. Distance to power source.

Answer: (A)

Standoff distance is the separation between a potential explosive device and the assets you want to protect—people, structures, or critical equipment. The idea is to keep enough space so the blast effects don’t reach dangerous levels at the protected site. This means reducing peak overpressure, impulse, and fragmentation exposure to below injury or damage thresholds, based on the expected explosive energy. In planning, you use the anticipated device size (often in TNT equivalents) to decide how far to keep things apart so safety criteria and protective measures hold. Distances to exits, decon points, or power sources concern response logistics or utilities, not the blast-protection separation itself, so they aren’t what standoff distance measures.