Big elephant in the room: Pre-test ban atmospheric nuclear tests.
Of course, there's nothing anyone can do about it. The somatic damage period is probably more or less over, but we are transitioning through the genetic damage period.
Isotopes of specific atoms have a different biochemical targetting and effect than EM radiation. Iodine is concentrated in the thyroid, strontium makes its way to the bone (close to hematopoetic stem cells), etc.
If this was a big elephant in the room, then I would expect there to be some modicum of evidence that this causes any increase in cancer risk. Maybe a shred of evidence that cancer rates have gone up? Anything. We'll wait.
Of course, there's nothing anyone can do about it. The somatic damage period is probably more or less over, but we are transitioning through the genetic damage period.