MadSci Network: Other

Re: The project I am proposing is the testing of different

Area: Other
Posted By: Artem Evdokimov, Grad student, Structural Biology (Chemistry)
Date: Fri May 2 18:00:28 1997
Area of science: Other
ID: 858733094.Ot
Dear user,

The simplest suggestion would be a photo cell with a filter cutting off
all but the ultraviolet part of the sun spectrum. Applying a thin film
of the sun block (take care to be precise in film thickness) and
measuring the yield of electricity or other characteristics of the cell ,
one can get a rough estimate. Another variant would be a piece of photographic
paper with the same filter and a layer of sunblock.

Some sunblocks work on a different principle then just filtering off
the  UV radiation. For these one can only suggest a suitable
biological model such as human skin. Apply a number of sunblocks, expose
the skin for a measured length of time, when the tan develops, take a
picture of the skin area and estimate or measure the darkening of the 
different areas. Take care not to burn yourself.



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