Web1. Thorium is a naturally occurring radioactive material and is widely used within MOD in magnesium alloy aircraft components, optical lenses and some laboratory compounds. … Web2 de jun. de 2015 · However, thorium eyepieces are dangerous. They can give a very large alpha and beta particle dose to the cornea of the eye, causing cataracts and other problems. ... (containing thorium oxide) lenses, including some of the Pony, Signet, and high end Instamatic (e.g. 800 and 814, but not 100 or 124) cameras.
The very underestimated problem of RADIOACTIVE lenses
Web26 de abr. de 2014 · We made 3 different tests on all my Russian lenses which are all OK excepted the Ma miya Sekor 55mm f1.4 (M42). Here are the results: From 5 to 10 µSV … WebThorium is a naturally occurring radioactive metal that is found in soil, rock, and water. It is formed by the radioactive decay of uranium. Minerals such as monazite, thorite, and thorianite are rich in thorium and may be … income tax filing date extended notification
Rare Earth Glass Leica Lenses: A Quick and Quirky Overview
Web18 de jun. de 2024 · It's just amazing that after Hiroshima, those engineers designing lenses with Thorium should've known better not to use anything remotely "radioactive" in a consumer product. Even if it supposedly made the images better. I'm curious, but not paranoid. I go through x-ray scanners, had CT Scans, etc. WebThorium has no known biological role. It is toxic due to its radioactivity. Natural abundance Thorium is found as the minerals thorite, uranothorite and thorianite. It is also found in monazite, which is the most important commercial source. Web7 de jun. de 2024 · Many lenses using thoriated glass employed it only for the front element(s), with regular crown or flint glass at the rear. This limits radiation which might, … income tax filing date extension 2022