What is a laser safety zone as defined in the material?

• A. A circular zone around the target with a fixed radius
• B. A 15 degree wedge with apex at the target
• C. A 25 degree wedge with apex at the target
• D. A 20 degree wedge whose apex is at the target, extends 10 degrees to the other side of the target to the laser designator line, and extends from surface to infinity

Answer: (D)

A laser safety zone is defined as an angular cone along the beam path with the apex at the target, marking the region where exposure control must be maintained. The material specifies it as a 20-degree wedge centered on the laser designator line, with 10 degrees to either side, extending from the surface to infinity. This means any potential exposure along and beyond the beam path is included, not a fixed circular area around the target. The other descriptions don’t match this angular, beam-path–oriented definition (they propose circular zones or different wedge sizes), so the 20-degree wedge extending to infinity best fits how the safety zone is defined.