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Re: [OM] Radioactive lenses ?

Subject: Re: [OM] Radioactive lenses ?
From: Mark Marr-Lyon <markml@xxxxxxx>
Date: Fri, 6 Apr 2001 20:02:28 -0700
If it is radioactive, you'd probably notice.  I don't know what Gary 
measured on the 55/1.2, but my 50/1.4 was registering about 4500 
counts/min on the front, about 200 counts/min on the back, with a 
background of about 20 counts/min.

Not all 55/1.2's are radioactive.  The black nose version Gary tested was 
not radioactive. Is your 55/1.2 a silver nose or black nose?  It would be 
interesting to know if they switched from silver to black when they 
switched the design.  

Mark Marr-Lyon

>Wow - I was excited to read that post about my Zuiko 55 f1.2 being
>possibly radioactive.  So I took to the lab and put it on the slab -
>well
>I was disappointed.  I checked it with two Geiger counters on the most
>sensitive settings and I could not detect anything.  Well, I guess the
>meters
>I used are not the most sensitive and the background radiation is pretty
>
>high where I was located.
>
>I'll be interested to hear about any other measurements people are
>making.
>
>- -- Hank

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