RE: Unidentified device

["Flood, John" <FloodJR@NV.DOE.GOV>]

>I have heard of old camera lenses being marginally

>radioactive (Th-232+decay products).



True.  At one time, thorium oxide was widely used in manufacturing glass to

change the index of refraction for microscope and camera lenses.  However,

it hasn't been used for this in decades.



Bob Flood

Nevada Test Site



************************************************************************

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line.

You can view the Radsafe archives at http://www.vanderbilt.edu/radsafe/