[Wavytone]

Wouldn't be surprised if lanthanum eyepieces are slightly radioactive too. (Vixen LV's, LVW's, NLV, TV Panoptics...)

There was a big military Erfle eyepiece - monster of a thing which Surplus Shed used to sell - which certainly did have radioactive glass in it. The element had a tendency to turn brown, if I remember correctly. And I had two of the Pentax lenses listed back in my film SLR days.

I'm not sure whether the "healing" trick works, it sounds a bit far-fetched IMHO, like Pyramid Power.