Some 60's f1.4 and faster SLR lenses used radioactive glass, f1.4 Takumars were one. A few other high speed lenses have similar glass.

We live with radiation all the time, and even going for a walk can expose you to it. My sister died from a rare cancer only seen in patients exposed to radiation fallout, she regularly walked in an area (in the UK) contaminated by fall out from Chernobyl. The farming restrictions are still in place today.

Ian