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Forum: Film SLRs and Compact Film Cameras
07-31-2014, 01:52 AM
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Another way to look at it - if there is radiation it is the result of the thorium turning into something else. The result would be that the glass would have other elements present and the low dispersion property of the thorium glass would not be there. Obviously for the lens to be useful the decay must be slow enough thyat it remains what it was made to be. If that is the case, the rate of decay must be slow, which means it is safe to use.
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