Article today "shade has little effect on uv"

[dkcombs@xxxxxxxxxx (David Combs)]

Saw this in today nando-news health-section:



                                                                
                                     Simple shade offers little protection from sun's UVB rays
                                                                 
      Copyright  1998 Nando.net
      Copyright  1998 Reuters News Service
      
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HERE IS DATE OF MOST RECENT MAIL:
- -rw-------  1 dkcombs    126648 Jul 13 14:37 /u7/dkcombs/.mailbox/inbox


   WASHINGTON (July 13, 1998 3:27 p.m. EDT http://www.nandotimes.com) -
   Dangerous ultraviolet rays can sneak into the shade along with
   people trying to evade sunburn, U.S. researchers said on Monday.

   Ultraviolet B (UVB) rays -- the most damaging UV rays from the sun
   -- bounce around in the air; seeking shade may not offer the best
   protection from them, Richard Grant of Purdue University in West
   Lafayette, Indiana, and Gordon Heisler of the U.S. Forest Service
   said.

   They said someone sitting in direct sunlight but surrounded by a
   grove of trees or buildings might get less UVB exposure than someone
   sitting in the shade of a single tree.

   "When people in the shade estimate UVB exposure based on an eyeball
   assessment, they're getting about twice as much UVB as they think,"
   Grant said in a statement.

   "How much UVB you're getting more closely correlates with how much
   sky you can see. If lots of the sky is obstructed, you're getting a
   lot less UVB."

   Snow reflects between 30 and 95 percent of the UVB that hits it,
   while green grass reflects about five percent, they added.

   Grant and Heisler decided to run checks to see just how much UVB
   people would be exposed to in places such as a tree-lined street, a
   grassy area and in a field. They also took a photograph of the sky
   in each area.

   They found that the more of the sky is obstructed by trees or
   buildings, the less UVB someone is exposed to. Being in actual shade
   is less of a factor, they said.

   They did not report on measurements of UVA rays, which can damage
   skin but which do not usually cause sunburn like UVB does.
   Overexposure to the sun's rays can also cause skin cancer.

   
    Copyright  1998 Nando.net
    Do you have some [23]feedback for the Nando Times staff?

References

   1. http://www.nando.net/nt/health/


- --
Bye,

Willem-Jan Markerink


      The desire to understand
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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