>I am trying to find out how much UV radiation is harmful for preservation
>of art objects and books
>in museums and libraries from direct sun and/or sky through windows and/or
>skylights? How would one go about
>measuring the UV radiation and what are the units, scale or index used for
>this purpose plus what instruments
>can anyone suggest for this purpose?
>
>thanks a lot
>Prerna

Hi. You should be asking this question on this site
http://palimpest.stanford.ede/cool   This is a conservation on-line service
that can answer this questions with citations,etc. There is a vast
literature.

Mike Bogle
Hyde Park Barracks Museum
Sydney, Australia