RE: Radiochemistry; N-16 equilibrium in coolant ???

["Sandy Perle" <sandyfl@ix.netcom.com>]

Due to the short half-life, the methodology of analysis is critical. 
It is comforting that all of the responses seem to be statistically 
equivalent, for plants of the same vintage, years of operation (a 
factor for any type of equilibrium), etc. Either all are right on, 
as far as their assumed concentrations, or, they are all off. Since I 
haven't been involved in the radiochemistry aspects for greater than 
20 years now, I suppose one method to determine an accurate and 
precise concentration, would be to take measurements over a set 
period of time (not the typical monthly assessments). Many plants 
have real-time measurement programs. It would be of interest to know 
if the data provided were spot samples (grab samples) or based on 
many samples over a long period of time. Hs anyone done any 
correlations to concentration compared to run times, after shutdown 
(how long before equilibrium is obtained - based on trended data) 
etc.
------------------
Sandy Perle
Technical Director
ICN Dosimetry Division
Costa Mesa, CA 92626
Office: (800) 548-5100 x2306 
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