I definitely agree that radon is a more realistic threat to ones self and family.
I remember reading somewhere that an astronomer snapped up a surplus aero ektar for use as an eyepiece(?).. The results after several years were not good from what I recall but I wish I could find the original quote of this.

Personally me, I think i'd rather find a Graf Variable Anastigmat or a Pentac and save the weight but that's another thread.