Читать книгу Patty's Industrial Hygiene, Physical and Biological Agents - Группа авторов - Страница 132

Shielding for optical radiation includes enclosures around sources, protective clothing and eyewear, and barrier creams (such as sunscreens) applied to exposed skin. Shields attenuate radiation by absorbing or reflecting it. Because absorption and reflection tend to be wavelength dependent, shields should be selected based on their ability to attenuate radiation in the spectral range(s) of concern. It should be noted that shields attenuate radiation but might not entirely block it. The transmittance of a shield in the spectral region of concern should be small enough that the transmitted radiation reaching the skin or eye will be below the applicable exposure limit.