2024 Thorium in cameras

Thorium in cameras

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August undefined, 2024

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 and the thorium content of the lens. The thorium in the … WebJun 8, 2007 · 5.3k. Posted May 20, 2007. The only lens I have ever heard of in the Canon FD line up with the Thorium element is the first four versions of the 35mm f2.0. The first chrome nose versions are always Thorium and those later marked S.S.C. with the concave front element are also Thorium. There is an excellent write on these on the Canon FD FAQ …

Uranium and thorium Geoscience Australia

http://forum.mflenses.com/removing-thorium-yellowing-with-a-uv-light-t82343.html WebMar 26, 2016 · hello! i have a question about Thorium in Pentax 67 system i know that Thorium is in the old 105mm f2.4 lenses ... It's good to know that Pentax also manufactures lenses for medical equipment not just cameras, some which use to contain Thorium. I'm pretty sure the medical community would be up in arms by now if there was really ... on the rocks hawaii

When did they stop using thorium in camera lenses?

WebJun 7, 2024 · A Radioactive Lens. Between the 1940s and 1970s, a number of camera manufacturers designed lenses employing thoriated glass in one or more elements. … WebList of Japanese lens brands ((Kowa))--Kowa Nikkor – Nikon Zuiko – Olympus Takumar – Pentax Canon Fujinon Sigma Tamron Cosina (often rebranded, Tokina etc.) Zunow Hoya Hanimar Eyemik Quantaray Eyemik-Quantaray Dejur J.C. Penney Phoenix Promaster Revue (Revuenon) Sears Spiratone 42mm screw lenses COMPATIBILITY OF LENSES PENTAX WebAug 1, 2024 · Thorium was used to improve the image quality, but the downside is that it becomes yellowish with time. And, well, that it’s radioactive. Mathieu did two mock tests to find out whether his radioactive lens could do him harm. ... « Nikon is killing their “1” mirrorless system cameras. on the rocks hours

9 More Benefits of Thorium Energy by Jim West - Medium

Thorium coated camera lens, what kind of danger is there from ... - Reddit

WebOct 8, 2024 · Of course, any lens could benefit from the addition of thorium, and after the war ended it started finding its way in to consumer products – primarily into lenses for … WebSome lenses produced from the 1940s through the 1970s were treated with radioactive thorium oxide to curb chromatic aberration. But as Andrew Walker explains in this 7.5-minute video, modern digital cameras can actually “see” that radiation as image noise that has the potential ruin your long exposures. on the rocks gymWebOct 12, 2024 · Thorium dioxide has a 30-50% higher refractive index than typical glasses which translates into some combination of less-curved (thinner) elements or greater … ios 13.0 iphone 7

"WebOct 11, 2012 · A Look at the Radioactivity of Old Manual Lenses. Oct 11, 2012. Michael Zhang. Radioactive Lens -- Pentax 50mm f/1.4 S-M-C Takumar. Watch on. YouTube user uyt384 does tests on old camera lenses ... " - Thorium in cameras

Thorium in cameras

USSR lenses (Soviet lenses). Best and worst - Andrew Lazarev …

WebNov 7, 2024 · Nov 6, 2024. #14. reddesert said: IME, digital detectors can be sensitive to radiation events, so if someone who has a known radioactive lens and a CCD digital camera took say a 30-60 second exposure in a dark room with the lens next to the sensor, they might see an increase in hot pixels (so called "cosmic ray" hits). WebDuring 2007-08 Geoscience Australia carried out a small thorium project to acquire: an improved understanding of the status and distribution of Australia's thorium resources for use in the determination of government policy and industry investment decisions. a better understanding of the geochemistry of the thorium cycle in the Earth's crust.

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WebThorium is also used to strengthen magnesium, coating tungsten wire in electrical equipment, controlling the grain size of tungsten in electric lamps, high-temperature crucibles, in glasses and used in camera and scientific instrument lenses. Other uses for thorium include heat-resistant ceramics, aircraft engines, and in light bulbs. WebNOTE: Thorium doped telescope eyepieces contain high levels of thorium (25%) and will cause damage to the cornea. Lenses That May Contain Thorium or Lanthanum. Kodak Ektar 101mm f/4.5 (Miniature Crown Graphic camera) lens mfg. 1946. Kodak Ektar 38mm f/2.8 (Kodak Instamatic 814 camera) lens mfg 1968-1970.

WebThe photograph shows an old camera lens that contains several pieces of glass. One of the pieces of glass includes a radioactive isotope, thorium-232. ... 2 Mark s. Thorium-232 undergoes alpha decay and produces an isotope of radium, Ra. Complete the equation for this decay. answer . top line correct e.g. 228; bottom line correct e.g. 88 and 2 ... WebOct 11, 2012 · A Look at the Radioactivity of Old Manual Lenses. Oct 11, 2012. Michael Zhang. Radioactive Lens -- Pentax 50mm f/1.4 S-M-C Takumar. Watch on. YouTube user …

WebSep 2, 2013 · Many camera lens had radioactive Thorium-232 coatings until mid 1970s. If coating turns brown/yellow tint its easily cleared up with ultraviolet light. Above video radiation test shows 25,000 CPM while normal background radiation is 20 CPM. That can't be good for you. Makes you wonder how radiation didn't expose the film. WebFor owners of cropped mirrorless cameras, I recommend looking not at cheap old USSR lenses, but at cheap Chinese modern ones. Chinese manual lenses are almost 99% made up of solutions for mirrorless cameras. Soviet optics, first of all, helps amateur photographers to touch fast fixes, which can cause euphoria after regular “dark” solutions.

WebOct 17, 2024 · Benefit #1 — Thorium is Plentiful. I don’t mean plentiful like silica or carbon, but it is 3 to 4 times more plentiful than uranium. And only a small percentage of uranium is the type that is ...

WebFurthermore, thorium dioxide is utilized in many ceramics and glasswork applications. Thorium dioxide is known to increase refractive index in glass, thus has many applications in optical lenses for cameras and scientific apparatuses. Thorium fluoride is used as an optical coating, and the list goes on. ios 12 on iphone 4sWebElement Thorium (Th), Group 20, Atomic Number 90, f-block, Mass 232.038. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. ... producing … ios 12 untethered jailbreakWebAug 1, 2024 · Measurements have indicated that the exposure rate at a depth of 10 cm in the body of an individual carrying a camera containing 0.36 uCi of thorium would be approximately 0.01 mrem/hr. Based on this value, NUREG-1717 calculated that a serious photographer might receive an annual exposure of 2 mrem. on the rocks hornitos margaritaWebApr 12, 2016 · I know the Takumar versions of the 105 f/2.4 lens contain elements doped in Thorium. Can anybody confirm if the later Pentax versions are the same (ple ... it is a rather soft material. I recall one of the reasons why ISS Astronauts use Nikon cameras and lenses is due to the fact that Flourite in Canon L lenses simply can't ... ios 12 software downloadWebUranium and thorium are not stable. They break down in a process called radioactive decay. More than 99% of natural uranium exists in a form (isotope) called uranium-238 while more than 99% of natural thorium exists as thorium-232. These metals decay very slowly eventually to form lead. on the rocks hornitosWebFeb 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. on the rocks hornitos margarita cocktailWebJan 6, 2024 · Thorium is used to make ceramics, welding rods, camera and telescope lenses, fire brick, heat resistant paint and metals used in the aerospace industry, as well as in nuclear reactions. Thorium has the potential be be used as a fuel for generating nuclear energy. Since thorium is naturally present in the environment, ... on the rocks house in buxton nc