Re: Environmental TLDs

["Sandy Perle" <sandyfl@earthlink.net>]

If you are going to place TLDs in a plastic bag, I recommend that 
you heat seal them. There will be still some moisture, most arising 
from the moisture already in the bag, and changes due to 
temperature and humidity fluctuations, moving the bag between a 
cool, humidity controlled lab, out into the environment.

Also consider some type of housing to surround the top and sides 
of the bag. This will prevent most water from effecting the bag, and, 
not degrade the response to the dosimeter.

If the TLD contains LiF elements, moisture will have no degrading 
effect on the element, or the resultant response.

If the TLD is a LiBO element, they are hydroscopic, and, require a 
significant amount of desiccation to dry them out. In some cases, 
they can not be dried adequately, and, the response obtained can 
not be considered to be valid.

------------------
Sandy Perle
Technical Director
ICN Dosimetry Division
ICN Plaza
3300 Hyland Avenue
Costa Mesa, CA 92626
Office: (800) 548-5100 x2306 
Fax:    (714) 668-3149
  
sandyfl@earthlink.net
sperle@icnpharm.com

ICN Dosimetry Website:
http://www.dosimetry.com

Personal Website:
http://www.geocities.com/CapeCanaveral/1205

"The object of opening the mind, as of opening 
the mouth, is to close it again on something solid"
              - G. K. Chesterton -

The opinions expressed are solely, absolutely, positively, definitely those of the author, and NOT my employer
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