Super Tak 50mm, but technically isn’t everything on earth somewhat radioactive?
If that's a joke, then yes...we even have radioactive personalities!
If it's not a joke...no, not everything on earth is radioactive. There are radioactive elements and non-radioactive elements. The difference is that radioactive elements have no stable primordial isotopes (in other words, they will be stable for so long as to effectively be stable forever.) There are some elements that theoretically have unstable isotopes but their half life is so long that they don't naturally decay at a rate we can measure or observe. The rest have half lives that can be measured or observed. All artificial elements are unstable and will radioactively decay.
Little bit of trivia. When it comes to the most dangerous radioactive elements, plutonium is considered the most toxic material on earth, as a handful of atoms are apparently enough to kill.
So...if your lens is made of plutonium...best ditch it.