Agree - the "containment" is fragile.
Some photographic lenses used thoriated glass (for example the 55mm F/2 Steinheil lens). There was concern that being in close proximity to the eye (when fitted to a 35mm camera) there could be a health risk. The risk was minimal as the radiation was absorbed in the glass itself and blocked or absorbed by the metalwork of the lens and camera.



Originally Posted by BTH K10A

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