Hi Jerry:
<< Just the lense coating would stop a lot of the Beta [and Alpha]
particles. >>
That is what the Gieger counter readings support. You can barely get a
reading if you hold the instrument to the wrong end of the lens from
where the rare earth element is. However, there are some lenses which I
recall have their rear element radioactive. Maybe fogging became an
issue in their demise.
Gary Reese
Las Vegas, NV
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