Quote Originally Posted by budrichard View Post
As a Nuclear Engineer I would not put too much confidence in your measurements unless you had a radioactive source to verify calibration/function of a GM device from the 1960's.
In any event unless you grind up a lens containing a radioactive element and injest, there will be no harm from external exposure and since the glass will quickly pass through your digestive system, no quantifyable internal effects anyway.-Dick
My eldest son is a physicist, and I asked him to look into the matter and he assured me there is no danger.