What is the nominal hazard zone (NHZ)?

The nominal hazard zone (NHZ) is defined as the area where the laser energy output exceeds the maximum permissible exposure (MPE) limits. The MPE is the highest level of laser radiation to which a person may be exposed without adverse effects. Therefore, the NHZ is crucial for safety in laser applications, as it helps identify areas that require precautions, such as protective eyewear or restricted access, to prevent potential eye or skin injuries from exceeding safe exposure levels. Understanding the NHZ allows practitioners to implement proper safety measures and ensure the responsible use of laser technology in clinical and commercial settings. This distinction makes option C the accurate choice in defining the NHZ.