Re: Thoriated Lenses (2nd Try)

["Mike Bohan" <mike.bohan@yale.edu>]

        Reply to:   RE>Thoriated Lenses (2nd Try)

Ron & RadSafers,

Referenced from the CRC - Handbook of Physics and Chemistry, 76th Ed., pg.4-30:

"Glasses containing Thorium oxide have a high refractive index and low dispersion.  Consequently, they find application in high quality lenses for cameras and scientific instruments."

Regards,

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><
Michael J. Bohan, RSO   |  e-mail: mike.bohan@yale.edu
Yale-New Haven Hospital |    Tele: (203) 688-2950
Radiological Physics    |     FAX: (203) 737-4252
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--------------------------------------
Date: 03/04/1998 10:21 AM
To: Mike Bohan
From: radsafe@romulus.ehs.uiuc.edu
Hi Folks,
I've noticed that most of the better camera lenses I've seen lately are
loaded with thorium.  Can anyone tell me why?  It occurs to me that the
thorium would increase the density and (surely?) the refractive index, but
I don't know enough about optics to know why that would be an advantage.
The only thing else that I could think of is that the thorium might boost
the temperatures in the casting process...again, why might that be an
advantage?
Thanks,
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       Ron Morgan <rgmorgan@lanl.gov>
       Operational Health Physics (ESH-1)
       Los Alamos National Laboratory
       MS E-503, Los Alamos New Mexico, 87545 (USA)
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