Radioactivity of some coal and shale of Pennsylvanian age in Ohio

Channel samples of the commercially important coal beds and associated rocks in the Pottsville, Allegheny, and Monogahela series of the Pennsylvanian system were collected in eastern Ohio. Equivalent uranium content of 0.001 percent or more was determined in the laboratory for five samples. The uranium content of the coal is less than the equivalent uranium content indicated by radioactivity measurements. None of the samples collected contain recoverable quantities of uranium in the ash.