here in Brazil we have natural radioactive beaches you can look for it "Guarapari radioactive beaches". The radiation levels arent enough to do any damage but we sold some sand to the US back in the day, and the US did what you would expect...in the process of extracting the Thorium out of it they made the sand more radioactive and than they sold it to construction companies. So people of Chicago are you guys ok? Felling warm in the winter? with you guys want more sand we have plenty in Espírito Santo.