of the nominal hazard zone (NHZ) for a laser system. To make matters worse, the laser layout in a research or educational setting can change with every experiment. The release of ANSI Z136.1... on the door. The ANSI Z136.1 definition on the use of the Danger sign reads: ""DANGER" indicates an imminently hazardous situation which, if not avoided, will result in death... for limiting access to the laser radiation" Engineering controls for laser safety concentrates on three specific areas:A.Physical protection from the hazard in the form of curtains...