permissible exposure limit An exposure limit that is set for exposure to an hazardous substance or harmful agent and enforced by OSHA (Occupational Safety and Health Act) as a legal standard. It is based on time-weighted average concentrations for a normal 8-hour work day and 40 hour work week
radiation exposureThe act or state of being subjected to electromagnetic energy strong enough to ionize atoms thereby posing a threat to human health or the environment
risk exposure plan A scheme or method of acting that takes effect if the probability of harm to an area or its population increases beyond a normal level