Thorium camera lens

Author: nslk

August undefined, 2024

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. WebDec 29, 2016 · Thorium glass (which could contain up to 40% thorium oxide) was used the same way modern, non-radioactive ED elements are used. Some of the larger Kodak Ektar (Aero) lenses could have up to 1/2 a pound of thorium oxide in one element. I sold one to a guy in China and was worried it wouldn't get through customs because of the radioactivity.

A Radioactive Lens - Fourmilab

WebManufacturing materials, when aged can lead to a yellowing of camera lens glass in addition to or alternatively radioactive elements in the production. ... MC Rokkor series and many of the Canon FD lenses and the Bausch and Lomb Super Baltars, of which some versions contain Thorium Oxide. As some of these lenses are highly sought after, ... WebMar 23, 2014 · photographer. If the camera lens contained the maximum permitted . concentration of thorium (30%), NUREG-1717 estimated that the . aforementioned annual … safonov and chiang robustness analysis

Thoriated Camera Lens (ca. 1970s) - Museum of …

http://camera-wiki.org/wiki/Radioactive_lenses WebThere 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 … WebNov 20, 2024 · 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 … they\\u0027ve 47

The very underestimated problem of RADIOACTIVE lenses - Cameras …

P67 RADIOACTIVE thorium-containing (thoriated) lenses

WebJul 28, 2024 · The tight construction and perfect ergonomics feel more natural than the chunkier Canon and somewhat flimsy Olympus offerings. And interestingly enough, unlike Canon FD lenses the M42 mount Super Takumars are also EOS-friendly. And et’s not forget the value proposition. These 50mm Super-Takumars are cheap. Webi scored this lovely old camera at a flea market. the lens partly consists of the radioactive element thorium.by adding thorium to the lens glass, a high ref... safonau gofynnol cenedlaethol gofal plantWebSep 11, 2024 · Canon FD Thorium Yellow Tint. Source: Media Division. Nikolas also talks about radioactive Canon FD lenses with Thorium Dioxide in some lens elements. He comes to the conclusion that the amount of radioactivity is not dangerous for humans nor for camera sensors under normal conditions. Canon FD Thorium Heal Process. Source: … safoodbank.org rural distribution

"WebJul 26, 2015 · Hi. I recently bought one of the radioactive Takumars (50mm f/1.4 Super) and it's clearly yellow due to the thorium content. Well, I removed the caps and covered the lens in aluminium foil (obviously not the front lens area) like some people have advised not to warm the lens too much in sunlight. " - Thorium camera lens

Thorium camera lens

Canon LTM Lenses with thorium? - Photrio.com Photography …

WebFind many great new & used options and get the best deals for Canon Fd 2/35mm Chrome Nose Thorium Glass #23406 Concave (1680983164) at the best online prices at eBay! Free shipping for many products! ... Cameras & Photo; Lenses & Filters; WebThorium decays by alpha emission into radium-228, which continues to decay through the thorium series into various nuclides, eventually arriving at stable lead-208. Attached to my Leica M6 film camera above is a Leica …

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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 … WebAug 1, 2024 · The results are comically extreme: Once he's done messing with us, Stern dives into the numbers to explain why radioactive lenses are actually nothing to worry …

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. WebMar 23, 2014 · photographer. If the camera lens contained the maximum permitted . concentration of thorium (30%), NUREG-1717 estimated that the . aforementioned annual doses could triple. Finally, FYI I want to add this link to the website of the Health . Physics Society dealing with thorium lense and how to solve the . problem of the colored reddish …

WebAug 29, 2024 · Multi Format. Aug 28, 2024. #2. Thorium emits alpha radiation. In air, alpha radiation can travel about an inch or so and cannot penetrate human skin so thorium …

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…

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 … they\\u0027ve 48WebOct 12, 2012 · The thorium in the lens was estimated to be 13 kBq (0.36 Ci). Using the 3–290 methodology described in Appendix A.4 for sources close to the body, the dose … they\u0027ve 48WebFind many great new & used options and get the best deals for RARE MINOLTA MD MC W.ROKKOR-SI 28MM F2.5 THORIUM FAST WIDE ANGLE LENS *NR MINT* at the best online prices at eBay! Free delivery for many products ... Minolta MD Minolta MD Wide Angle Camera Lenses, Lens Adapter for Minolta MD/MC/SR, Minolta MD Camera Wide Angle … they\u0027ve 47WebJul 30, 2011 · This assumed that the photographer carried the camera 30 days per year and for 6 hours per day. They also estimated an exposure of 0.7 mrem per year for an average photographer. If the camera lens contained the maximum permitted concentration of thorium (30%), NUREG-1717 estimated that the aforementioned annual doses could triple. they\\u0027ve 4dWebElement Thorium (Th), Group 20, Atomic Number 90, f-block, Mass 232.038. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, ... producing thoriated glass for use in … s a f on ak47WebJun 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. … they\u0027ve 4dWebMar 2, 2016 · Posted February 29, 2016. A lens called the Summitar* was produced in two batches with serial numbers from 812242 to 812323 and from 812341 to 812360. This closely resembled the first collapsible version of the Summicron. It contained slightly radioactive glass produced by Chance Brothers. they\u0027ve 4b