Everything is radioactive, just at different rates. Just as all matter is maintained through inflows of ether.
Gustave Le bon wrote about this in 1920 in his book: The Evolution of Matter". PDFs available online. second half of book is experiments to prove it to yourself.
This book was banned during the Manhattan Proj because it proves "nukeelar" weapons as false, just as Nikola Tesla said.
http://mileswmathis.com/trinity.pdf