Radon - 86

Tanner, A.  At a German Health Spa, Radiation is King.

http://abcnews.go.com/International/story?id=81664&page=1

 

14 everyday helpful uses of...nuclear waste?!

http://www.thingsworsethannuclearpower.com/2015/08/everyday-radioactive-nuclear-waste.html

 

Radon

https://en.wikipedia.org/wiki/Radon

 

Isotopes of Radon

https://en.wikipedia.org/wiki/Isotopes_of_radon