Thanks for your post. I don't doubt it at all but it won't fit in with the alarmists agenda. Many chemicals are harmful at high doses but beneficial at low or recommended doses.
Wanna start an argument? Mention hormesis in radiation health physics. Hormesis is the name of the phenomenon to which you refer.
A study found a positive correlation (not cause) from low level radiation exposure to general good health. They hated it. I was a datum.