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 mined for the metal. Thorium has coloring properties that have made it useful in ceramic glazes. WebThorium is a member of the actinide series, and decays by alpha emission with a very long half-life. ... Taylor et al. (1983) measured the absorbed dose rate at the back of a camera …
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WebSep 29, 2024 · Older camera lenses: some camera lenses from the 1950s-1970s incorporated thorium into the glass, allowing for a high refractive index while maintaining a low dispersion. The health risk from using older camera lenses is low; the radiation received when using a thoriated lens camera is approximately equal to natural background. WebCamera lenses known to have contained thorium include: Canon FL 58mm f1.2 GAF Anscomatic 38mm f2.8 (Anscomatic 726 camera) Kodak Ektanar 38mm f2.8 (Instamatic 804 camera) Kodak Ektanon 46mm f3.5 (Signet 40 camera) Kodak Ektanon 50mm f3.9 … au wallet ポイント 移行
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WebApr 28, 2014 · In a scam-studded decade of Congress rule, the public has reached scam fatigue and numbers as stratospheric as Rs 60 lakh crores, the amount the thorium scam is supposed to have embezzled, are out of the comprehension of the common man. Yet an alleged scam of such value, not just pecuniary but also strategic, is worth reconsideration. http://forum.mflenses.com/removing-thorium-yellowing-with-a-uv-light-t82343.html WebFeb 15, 2024 · Glass containing thorium oxide has both a high refractive index and wavelength dispersion, and is used in high quality lenses for cameras and scientific instruments. Another thorium compound, thorium fluoride (ThF 4), is used in carbon arc lamps for movie projectors and searchlights. au wallet ポイント 使える店