Unrelated, but also camera lenses made of thoriated glass - up to 30% weight is radioactive thorium. High refractive index due to the density, but tends to discolour brown over time due to the ionising radiation.
But enough radiation to discolour the lens which, for a camera, is a problem. Can discolour all the photographs and give them an amber tint. Like a permanent "film set in Mexico" mod.
11
u/jerquee 1d ago
You can still buy photographic brushes with polonium-210 in them.