Читать книгу Patty's Industrial Hygiene, Physical and Biological Agents - Группа авторов - Страница 86

Class 4 lasers may pose a potential fire hazard, a significant skin hazard, or a diffuse‐reflection hazard. Virtually all surgical lasers and material processing lasers used for welding and cutting are Class 4 if not enclosed. All lasers with an average power output exceeding 0.5 W are Class 4. If a higher power Class 3 or Class 4 is totally enclosed so that hazardous radiant energy is not accessible, the total laser system could be Class 1. The more hazardous laser inside the enclosure is termed an “embedded laser.”