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On 7/31/2022 at 9:31 PM, rramesh said:

Not sure how accurate this is, but it might be useful for OP. 
 

https://camerapedia.fandom.com/wiki/Radioactive_lenses

i don't know if that version is hot, but i recently bought a geiger counter online from jeff bezos... to test all my vintage glass - just to help me sleep at night 😅 so far the general camerapedia list has been reliable

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3 hours ago, sometimesmaybe said:

i don't know if that version is hot, but i recently bought a geiger counter online from jeff bezos... to test all my vintage glass - just to help me sleep at night 😅 so far the general camerapedia list has been reliable

Thank you. I was looking at that. Currently I’m waiting for a call from someone from the Fire Hall to see if they have a Geiger counter (someone else’s suggestion) and if not I might go that route (buy one)

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So, as a physicist, when I studied in school and did experiments in lab (many, many years ago) Thorium gives off alpha and beta particle. Alpha particles can't penetrate your skin, whereas the Beta might. Anyway, we were using quite active sources and measure peak output and Compton scattering. They basic rule was never eat when near the sources, that's it.

My 1964 Tele-Elmarit 90mm chrome lens is radioactive and is spectacular.

Joel

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If something is a bit radioactive, it is not necessarily a bad thing. It is only a problem when the amount gets too high.

This might put things in perspective for you?

 

Sorry, can;t get the link to work. Will fix it later!

 

https://www.thoughtco.com/radioactive-everyday-products-608655This
Edited by Calvito
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As long as the average human body generates Beta and Gamma radiation with an intensity of around 5.000Bq (this is per second!) due to the radioactive Potassium-40 isotope (half life 1.3 Bill years) which we carry by nature in our blood and body, I would not be overly concerned about radiation stemming from lens which usually is kept in a certain distance from the body most of the time.

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Radioactive? if you are worried about cancer don't carry electronic in you pockets. still no guarantees. most likely not the lens or the camera.
 

Some lenses that Leica that where special made for the Military had higher radioactivity . this lenses where called Elcan and came often in a box with the Leica KE-7a

they are rare and expensive, Still an amazing resolution lens, made in the 70's for arial photography.

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vor 5 Stunden schrieb Photoworks:

Some lenses that Leica that where special made for the Military had higher radioactivity . this lenses where called Elcan and came often in a box with the Leica KE-7a

they are rare and expensive, Still an amazing resolution lens, made in the 70's for arial photography.

I knew a photographer on a aircraft carrier, he used the KE-7 as his basic documentation camera. He loved it, once made a comment about being on a ship with atomic bombs and worrying about radioactive lenses. The carrier he was on was being decommisioned, he was told to throw the KE-7 overboard, couldn't do that.

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