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Nor do they suffer from yellow discoloration over decades of time.
So it isn't the thorium or the lanthanum that causes the problem here.
If you want to buy some slightly radioactive lenses and cameras, the U. So if your government surplus bargain camera or lens is contaminated, it is probably only "lightly" contaminated. "Hot" Lenses made from Radioactive Materials Many specialty optical glasses have radioactive elements added to them, either as desired components or as impurities in the mixtures being used.
These slightly radioactive elements such as thorium or rare earth elements such as lanthanum were used to produce desired highly refractive glasses.
But after chemically purifying the thorium from its ore sources, the thorium is relatively free of these daughter products.
Since Bib Me™ makes it easy to create citations, build bibliographies and acknowledge other people’s work, there is no excuse to plagiarize.Most school physics labs can do this, as can local Civil Defense offices and police or fire emergency response teams.Another important point here is that these contamination levels vary from batch to batch, depending on the contamination in the sands used to make the impure chemicals being used.Sometimes in checking links, I find that those sites have disappeared.Sometimes I have kept copies in different formats of information on those sites.