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5.2 Exposure Geometry 5.2.1 Direction of Irradiation

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When possible, potentially hazardous optical radiation sources should be located out of the line of sight of workers. UV sources, which may pose a hazard to the skin as well as the eyes, should be oriented to avoid direct irradiation of exposed skin. An example is the use of upper room germicidal UV radiation, where germicidal lamps are positioned and baffled so as to flood the unoccupied upper space of a room with UV‐C radiation while limiting the amount of reflected or stray radiation that reaches the lowest 2 m (6.5 ft) of the room (45).

If a surface directly irradiated by a hazardous optical radiation source is capable of reflecting radiation into a worker's eye, or onto exposed skin in the case of UV radiation, that surface should be treated with a matte or absorptive finish.

Patty's Industrial Hygiene, Physical and Biological Agents

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