Radioactivity Concerns
Early reporting raised concerns about the presence of phosphogypsum, gypsum formed as a by-product of processing phosphate ore into fertilizer with sulfuric acid. Phosphogypsum is radioactive due to the presence of naturally occurring uranium and radium in the phosphate ore. The substance has been banned for use in U.S construction since 1989. Tests of drywall samples by the EPA and the Florida Department of Health showed some radioactivity, but at levels no higher than those ordinarily found in the natural environment.
Read more about this topic: Chinese Drywall
Famous quotes containing the word concerns:
“Science asks no questions about the ontological pedigree or a priori character of a theory, but is content to judge it by its performance; and it is thus that a knowledge of nature, having all the certainty which the senses are competent to inspire, has been attained—a knowledge which maintains a strict neutrality toward all philosophical systems and concerns itself not with the genesis or a priori grounds of ideas.”
—Chauncey Wright (1830–1875)