Ultraviolet radiation tests

Is there any method for testing for Ultraviolet radiation?

If not, does anyone know of a photo-sensitive paper that favors the UV
end of the spectrum?  If there is such, could it be placed in an area to
be tested for UV and checked after a day, week, or month ?  It's color
would indicate low or high UV, the way humidity indicator paper shows
the relative humidity or pH testing pens indicate pH.

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                  Conservation DistList Instance 5:15
                 Distributed: Saturday, August 17, 1991
                        Message Id: cdl-5-15-006
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