UV protective material

["George Rawls" <george@pliny.ehs.ufl.edu>]

I have a question from a lab and have been unable to find an answer 
in my texts and manuals.

The question: We have a UV light box which produces a 312nm 
wavelength for viewing ethidium bromide agarose gels.  It uses 6, 15 
watt bulbs.  We need to buy a shield and the catalog offers a 
polycarbonate or an acrylic material.  Which is sufficient for this 
wavelength?  Both?  Is the only difference one of strength?  

I have no text which discusses materials except in a general way and 
I view this as a chance to broaden my knowledge of UV....so if anyone 
can answer the question(s) AND offer advice on text, I would 
certainly appreciate it.

If you don't think the list needs the info, please respond directly 
to me.

george@pliny.ehs.ufl.edu
George Rawls
University of Florida
Health Physicist
george@pliny.ehs.ufl.edu