Radioactive tiles at a grade school.  (External Sample) 
These are pretty art-deco style decorative tiles behind the drinking fountains at my children's 1920's era grade scrool.  They read about 4000 counts per minute on my alpha-beta-gamm Geiger counter due to the use or uranium in the glaze (similarly to the way uranium was used in Fiestaware dishes for decades). 
Location: Leal School 
Photographed: 15 April, 2009 
Text Updated: 16 April, 2009 
Size: 96" 
Purity: <10%
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