Creteil78
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Posts posted by Creteil78
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On 4/26/2014 at 12:13 PM, Junior said:
Hi!
It's one of my first posts here but not the funniest I guess…
I'm not especially talking about a magic C-lens in particular here but about a very underestimated question: radioactive lenses!
One of my friends is a fireman captain and introduced me yesterday to one of his colleagues specialized in technological risks and chemical dangers (at Poissy, France : they're known to have very great equipments.) We made 3 different tests on all my Russian lenses which are all OK excepted the Mamiya Sekor 55mm f1.4 (M42).
Here are the results:
From 5 to 10 µSV per hour (by direct touch), and 1720 shocks per second.
Element involved is Thorium 232.
They told I really shouldn't keep it. Work with it more than one hour is dangerous. It must be gifted to specialized services and absolutely not be destroyed! Or thrashed! The most dangerous exposure isn't even radiations but dusts to inhalate or ingerate (when a lens gets old it disaggregates - it's something you can't always clearly see).
I'm lucky cause until today I kept it in my basement.
So, say it please to your friends and all potential Mamiya/Takumar users that you know via websites etc, it's a strong matter of health.i sent you a MP.
if you are willing to discuss those topics.
The very underestimated problem of RADIOACTIVE lenses
In: Cameras
Posted
Yep. Indeed. It's not only an alpha emitter
and there is not only Thorium, also Lanthanium or something like that