RE: Asking for opinions -Reply

[L_K_II_Les_Aldrich@RL.gov]

Sandy,

No.  The fade correction factor is based on emperical studies for the
(LiF) chip type used.  These studies were done prior to the chips going
into field use.  We conduct monthly, quarterly, and annual quality
assurance evaluations on the dosimeters which include confirming that
the fade correction factor is still correct.  So far, the QA dosimeters
have performed quite nicely. 

We recently completed a 14-month emperical study on our (LiF) neutron
dosimeters that provided the basis for extending the maximum wear period
for those dosimeters to one year.

Our correction factor is very close to your 120-day value.

Les Aldrich
l_k_ii_les_aldrich@rl.gov

> -----Original Message-----
> From:	Sandy Perle [SMTP:sandyfl@earthlink.net]
> Sent:	Thursday, September 16, 1999 2:01 PM
> To:	Multiple recipients of list
> Subject:	RE: Asking for opinions -Reply
> 
> > Normal fading is corrected for by routine dosimeter processing
> protocol.
> 
> Les, I assume that you mean that an ample number of Control 
> Dosimeters, that were annealed at the same time the field dosimeters 
> were annelaed and issued, are maintained, stored properly, and then 
> processed along with the field dosimeters?
> 
> Actually, if you're using either LiBO or LiF, the fade for all 
> practical purposes levels off after approximately 120 days, to about 
> 0.81. Ca elements have less fade, even up to and after 120 days.
> 
> A long term fade study should be performed and documented, since 
> there will be some variation based on system setup.
> 
> Sandy Perle
> E-Mail: sandyfl@earthlink.net 
> 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 RADSAFE Frequently Asked Questions list, archives and subscription
> information can be accessed at
> http://www.ehs.uiuc.edu/~rad/radsafe.html
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html