The UV spectrum is divided into the following key regions: UV-C (270 to 290 nm), UV-B
(290 to 320 nm), and UV-A (320 to 400 nm). UV-A is further subdividedinto two regions:
short-wave UV-A or UV-A II (320 to 340 nm) and long-wave UV-A or UV-A I (340 to 400
nm). UV-C radiation does not normally reach the terrestrial surface because of filtration
by ozone and atmospheric moisture. The atmosphere does not protect humans completely
from damage by UV-B and UV-A radiation, however.
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Article info
Footnotes
Address reprint requests to: Sheldon R. Pinnell, MD, Duke University Medical Center, Box 3135, Room 4044 Duke South, Durham, NC 27710
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Copyright
© 2000 W. B. Saunders Company. Published by Elsevier Inc. All rights reserved.
