Why is barium sulfate so radioactive?

Barium sulfate is not measurably radioactive at all. It has a couple of radioactive isotopes, but they make up less than one part in a thousand of natural barium and have a half life in the region of a trillion years - the decay is so slow that we can’t even be certain it does decay. read more

Barium sulfate (or sulphate) is the inorganic compound with the chemical formula Ba SO 4. It is a white crystalline solid that is odorless and insoluble in water. It occurs as the mineral barite, which is the main commercial source of barium and materials prepared from it. read more

All isotopes of barium ordinarily found in nature are stable. Like all elements, barium has synthetic radioactive isotopes. read more