Flying with thorium lenses

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August undefined, 2024

There are a significant number of lenses produced from the 1940s through the 1970s that are measurably radioactive. Main source of radioactivity is the use of thorium oxide (up to 30% by weight) as a component of the … See more Typical radiation levels can approach 10 mR/hr (100 μSv/h) as measured at the lens element's surface, decreasing substantially with … See more 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 high-end cameras. Over the years a number of manufacturers began making thoriated lenses, a practice that continued into the 1980s.

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WebFeb 23, 2024 · Some lenses produced from the 1940s through the 1970s were treated with radioactive thorium oxide to curb chromatic aberration.But as Andrew Walker explains in … 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. … portadown elim church facebook

Flight armor - Thorium Mod Wiki

Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses. It is useful to this process due to its high refractive index. Thoriated glass is radioactive due to the inclusion of thorium dioxide, oxide of radioactive element thorium. It has therefore been succeeded as a material of choice by glass including lanthanum oxide. Thoriated glass can contain up to 30% by weight of thorium. The thoriated glass elements in lenses over ti… WebAug 10, 2009 · Some lenses known to contain thorium oxide in the glass do not emit enough radiation to become yellow, but it's still more than background level radiation. Apparently, the use of thorium oxide was abandoned by Japanese SLR lens makers by the mid-1970's. Those makes that did use thorium oxide in some products also made … WebFeb 2, 2024 · Flying on an aeroplane (about 2μSv/h of Cosmic radiation) ... Current consumer lenses do not contain thorium – it has been replaced with newer formulations … portadown elim church live today

Thorium - From Lenses to Fuels - Nevada Technical Associates, Inc.

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WebJan 27, 2024 · Radioactive lenses. Many lenses produced from the 1940s through the 1980s are measurably radioactive. The main source of radioactivity is the use of thorium … WebCross Country Flight: ~5 mrem (~1 mrem/hr flying) Average yearly background dose: ~350 mrem ( ~1 mrem a day) Putting it into perspective, occasionally using these lenses really is not a concern. It's safe to store in your personal items away from you and other people (the garage, a safe, a closet, etc.). portadown emmanuel churchWebTaylor 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 lens was estimated to be 13 kBq (0.36 … portadown elim church live stream

"WebOnce a pilot has fully recovered with a fixed lens and meets FAA vision standards, they typically may return to flying on their current medical. Note, however, that in Sep 2014 … " - Flying with thorium lenses

Flying with thorium lenses

WebFeb 22, 2016 · Coznix, The Fallen Beholder - Hell based early-hardmode boss/ 16000 hp-Summons minion beholders and unleashes various magical abilities that do intense damage-Defeating the Fallen Beholder will bring a special ore to your world based on the void lens you use-Void Lens (1) - 3 souls of Night, 3 Souls of Light, 2 Thorium Bars, 1 … WebOct 4, 2024 · Paris-based photographer, filmmaker and weird lens enthusiast Mathieu Stern shows us using a Super Takumar 35mm f/2! First, he tells us that these radioactive …

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http://camera-wiki.org/wiki/Radioactive_lenses WebNov 11, 2016 · It discusses the early MC Rokker lenses (1966-1972) where it says: "The quality of the coatings on these lenses is as a general rule not as good as those on later MC and MD lenses, and in some cases radioactive compounds of thorium and lanthanum were added to the glass mixture to increase the refractive index. This is apparent in some of …

WebDec 9, 2010 · Canon did have "Flourite" lenses - these had a green band around the hood (if there was a built in hood) - and were marked flourite on th ename ring. Flourite lenses ar enot common - there was a 24mm which I've never seen, a 55/1.2 which they made around 350 off, plus the 300/2.8 flourite. These are all old FD mount.

WebThoriated glass elements allowed lenses to deliver low levels of aberration and distortion with relatively simple and easy to manufacture designs. As with everything in engineering, there are trade-offs. Thorium is a … WebAug 1, 2024 · He placed near the lens some Usnea Barbata, a plant sensitive to radioactivity. And for the second test, he kept the lens near him for a week, all the time. …

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WebFeb 2, 2005 · The reason camera companies stopped using Thorium in lenses has nothing to do with radioactivity. Any Thorium based lens turns yellow over a timespan of 20-30 … portadown dublin trainWebJun 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. Incorporating as much as 40% thorium dioxide ... portadown elim facebookWebApr 4, 2024 · There is no risk associated with flying if you have floaters or flashes. The only time it may not be safe to fly is if you have had retina surgery and have a gas or air … portadown facebook pageWebAug 1, 2024 · The results are comically extreme: Once he's done messing with us, Stern dives into the numbers to explain why radioactive lenses … portadown facebook postsWebFeb 13, 2024 · If not, and you are not over reading glasses age (40-50 years old or so), you should be able to read the screen without reading glasses. If you have normal (no glasses needed) vision, you should also be able to see the drone without glasses. You would only need sunglasses for the glare, if the drone is in the sunlight. portadown facebookWebBased on the dates of the previously mentioned patents, I suspect that the first commercial lenses to incorporate thorium appeared in the 1950s. These lenses have been … portadown estate agentsWebCross Country Flight: ~5 mrem (~1 mrem/hr flying) Average yearly background dose: ~350 mrem ( ~1 mrem a day) Putting it into perspective, occasionally using these lenses really … portadown fairgreen