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Re: Yellowing of radioactive lens elements....Re: [OM] 55/1.2

Subject: Re: Yellowing of radioactive lens elements....Re: [OM] 55/1.2
From: whunter <whunterjr@xxxxxxxx>
Date: Mon, 11 Aug 2003 15:47:45 -0400
Yes / No. Very aware of that potential. There are a number of science issues relevant to the effects of radiation induced damage which promote inhomogenity. IF..... if Dapoz is able to demonstrate focal defects characteristic of alpha particle damage, this does not exclude chemical induced color change, but strongly weights toward the former. If a magnified view fails to demonstrate any focal defects, chemical color change remains STRONGLY in contention. Results are only a logic 'sort', not proof of one or the other.

Need feedback re issue of uniform glass based versus surface....
Bill Hunter

On Monday, August 11, 2003, at 03:38  PM, Jeff Keller wrote:

I would think that glass used for making lenses is much more homogenous
than glass made for colored glass dishes. If he were to find significant
differences I would be worried about more about the lens quality than
radiation.
-jeff
----- Original Message -----
From: "whunter" <whunterjr@xxxxxxxx>

  But......   my
limited experience in examination of radiation altered glassware
suggests inhomogeneities are always present when the damage is from
ionizing radiation (i.e. not chemical induced color change).   Dapoz,
can you acquire a magnified view of the central region of this lens
image to look for 'bubbles' or other tiny focal defects characteristic
of radiation damage???

Carry on...
Bill


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