Laser Safety Guide
Laser Controlled Area
When the entire beam path from a Class IIIB or Class IV laser is not sufficiently
enclosed and/or baffled such that access to radiation above the MPE is possible,
a "laser controlled area" is required. During periods of service, a controlled
area may be established on a temporary basis. The controlled area will encompass
the NHZ. Those controls required for both Class IIIB and Class IV installations
are as follows:
- Posting with Appropriate Laser Warning Signs:
Class IIIA (beam irradiance 2.5 mW/cm(2)), Class IIIB and Class IV lasers require
the DANGER sign format (white background, red laser symbol with black outline
and black lettering). Note that under ANSI Z-136.1 criteria, area posting is required
only for Class IIIB and Class IV lasers.
Class II OR Class IIIA areas (if the LSO chooses to post): All signs (and labels)
associated with these lasers (when beam irradiance for Class IIIA does not exceed
2.5 mW/cm(2)) uses the CAUTION format (yellow background, black symbol and letters).
During times of service and other times when a temporary laser controlled area
is established, a NOTICE sign format is required (white background, red laser
symbol with blue field and black lettering). This sign is only posted during time
when service is in progress.
- Operated by Qualified and Authorized Personnel: This includes appropriate
training of the individuals in aspects of laser safety training.
- Transmission from Indoor Controlled Area: The beams shall not, under any circumstances,
be transmitted from an indoor laser controlled area unless for specific purposes
(such as testing). In such cases, the operator and the LSO must assure that the
beam path is limited to controlled air space.