From: pauld@exploratorium.edu
Date: Mon Feb 05 2001 - 10:29:06 PST
Message-Id: <200102051829.KAA09442@isaac.exploratorium.edu> From: pauld@exploratorium.edu Subject: Re: pinhole Radiation through glass Date: Mon, 5 Feb 2001 18:29:06 GMT
Hello Alejandra
The UV is divided into three regions.
UVA nearest to the blue
UVB
and UVC
UVC is germicidal but does nt propagate through air so on earth we don't have to
worry about it.
UVB is very effective at causing sunburns and sun tans. Window glass blocks
almost all UVB.
UVA does cause tanning and may cause burning but it requires much higher doses
than UVB. Window glass allows through some UVA. So you can tan and burn through
window glass.
Paul D
> Hi!
> Our Costa Rican organization is preparing a section for our web page
> (http://www.cientec.or.cr -mostly in Spanish) on radiation, eye protection, skin
> care and more to accompany our Dec. 14, 2001 Annular Eclipse campaign that we
> will do locally and would like to ask for help in understanding some concepts and
> finding good sources.
>
> I appreciated the suggestion from the Learning Studio on the Article Black and
> White from the Feb. issue of Discovery. It is interesting, easy to read and
> short. It does not answer why the Inuits are brown, but I guess that has to do
> with evolutionary periods. The article can be used by teachers in their own
> classrooms ( here - private schools that teach science in English or in most
> schools in the English class by
> English teachers that do not fear science).
>
> My main questions right now have to do with radiation through glass.
>
> Can you tan through glass?
>
> If that were so, then I guess in high latitudes people who like to tan
> would have glass rooms to lay in, instead of the tanning saloons.
>
> Are there different types of glass and could you purchase a tanning glass if you
> wanted to? What rays go through glass? Surely the infrared, since we can warm
> up behind glass. Are the infrared in any way responsible for the tan?
>
> Since I am in Costa Rica and I have difficulties with access to printed sources,
> I would appreciate your help with web sources, electronic materials that can be
> accessed through the learning studio and such.
>
> And if anyone of you wants to come and see the eclipse, let me know.
>
> Thank you in advance,
> Alejandra
> --
> __ http://www.cientec.or.cr
> /\_\ __ ___ __ ___ ____ ___ ___
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> Tel:(506) 233-7701, Fax:(506) 255-2192
> P.O.Box 8536-1000, San José, Costa Rica
>
>
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