It's very mildly radioactive due to trace amounts of naturally occurring uranium and thorium (and the daughter isotopes they decay into). Those elements are pre

It's very mildly radioactive due to trace amounts of naturally occurring uranium and thorium (and the daughter isotopes they decay into). Those elements are present because they're in seawater, and the deposits it came from ultimately came from seawater drying. The "phosphogypsum is radioactive waste" claim is hype. https://en.wikipedia.org/wiki/Phosphogypsum https://en.wikipedia.org/wiki/Phosphogypsum